657 lines
22 KiB
Objective-C
Executable File
657 lines
22 KiB
Objective-C
Executable File
//
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// LYEmptyView.m
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// LYEmptyViewDemo
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//
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// Created by liyang on 2017/5/10.
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// Copyright © 2017年 liyang. All rights reserved.
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//
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#import "LYEmptyView.h"
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//每个子控件之间的间距
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#define kSubViewMargin 20.f
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//描述字体
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#define kTitleLabFont [UIFont systemFontOfSize:16.f]
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//详细描述字体
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#define kDetailLabFont [UIFont systemFontOfSize:14.f]
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//按钮字体大小
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#define kActionBtnFont [UIFont systemFontOfSize:14.f]
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//按钮高度
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#define kActionBtnHeight 40.f
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//按钮宽度
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#define kActionBtnWidth 120.f
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//水平方向内边距
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#define kActionBtnHorizontalMargin 30.f
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//背景色
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#define kBackgroundColor [UIColor colorWithRed:250.f/255.f green:250.f/255.f blue:250.f/255.f alpha:1.f]
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//黑色
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#define kBlackColor [UIColor colorWithRed:0.3f green:0.3f blue:0.3f alpha:1.f]
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//灰色
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#define kGrayColor [UIColor colorWithRed:0.5f green:0.5f blue:0.5f alpha:1.f]
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@interface LYEmptyView ()
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@property (nonatomic, strong) UIImageView *promptImageView;
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@property (nonatomic, strong) UILabel *titleLabel;
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@property (nonatomic, strong) UILabel *detailLabel;
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@property (nonatomic, strong) UIButton *actionButton;
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@property (nonatomic, strong) UIView *customV;
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@end
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@implementation LYEmptyView
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{
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CGFloat contentMaxWidth; //最大宽度
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CGFloat contentWidth; //内容物宽度
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CGFloat contentHeight; //内容物高度
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CGFloat subViweMargin; //内容物上每个子控件之间的间距
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}
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- (void)initialize{
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self.actionBtnHeight = 40.f;
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self.actionBtnWidth = 120.f;
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self.actionBtnHorizontalMargin = 30.f;
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self.detailLabMaxLines = 2;
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}
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- (void)prepare{
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[super prepare];
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self.autoShowEmptyView = YES; //默认自动显隐
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self.contentViewY = 1000; //默认值,用来判断是否设置过content的Y值
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}
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- (void)setupSubviews{
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[super setupSubviews];
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contentMaxWidth = self.emptyViewIsCompleteCoverSuperView ? self.ly_width : self.ly_width - 30.f;
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contentWidth = 0;//内容物宽度
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contentHeight = 0;//内容物高度
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subViweMargin = self.subViewMargin ? self.subViewMargin : kSubViewMargin;
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//占位图片
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UIImage *image;
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if (self.imageStr.length) {
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image = [UIImage imageNamed:self.imageStr];
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}
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if(self.image){
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[self setupPromptImageView:self.image];
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}else if (image) {
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[self setupPromptImageView:image];
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} else{
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if (_promptImageView) {
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[self.promptImageView removeFromSuperview];
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self.promptImageView = nil;
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}
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}
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//标题
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if (self.titleStr.length) {
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[self setupTitleLabel:self.titleStr];
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}else{
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if (_titleLabel) {
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[self.titleLabel removeFromSuperview];
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self.titleLabel = nil;
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}
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}
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//详细描述
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if (self.detailStr.length) {
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[self setupDetailLabel:self.detailStr];
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}else{
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if (_detailLabel) {
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[self.detailLabel removeFromSuperview];
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self.detailLabel = nil;
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}
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}
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//按钮
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if (self.btnTitleStr.length) {
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if (self.actionBtnTarget && self.actionBtnAction) {
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[self setupActionBtn:self.btnTitleStr target:self.actionBtnTarget action:self.actionBtnAction btnClickBlock:nil];
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}else if (self.btnClickBlock) {
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[self setupActionBtn:self.btnTitleStr target:nil action:nil btnClickBlock:self.btnClickBlock];
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}else{
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if (_actionButton) {
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[self.actionButton removeFromSuperview];
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self.actionButton = nil;
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}
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}
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}else{
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if (_actionButton) {
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[self.actionButton removeFromSuperview];
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self.actionButton = nil;
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}
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}
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//自定义view
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if (self.customView) {
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contentWidth = self.customView.ly_width;
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contentHeight = self.customView.ly_maxY;
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}
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///设置frame
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[self setSubViewFrame];
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}
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- (void)setSubViewFrame{
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//emptyView初始宽高
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CGFloat originEmptyWidth = self.ly_width;
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CGFloat originEmptyHeight = self.ly_height;
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CGFloat emptyViewCenterX = originEmptyWidth * 0.5f;
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CGFloat emptyViewCenterY = originEmptyHeight * 0.5f;
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//不是完全覆盖父视图时，重新设置self的frame（大小为content的大小）
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if (!self.emptyViewIsCompleteCoverSuperView) {
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self.ly_size = CGSizeMake(contentWidth, contentHeight);
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}
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self.center = CGPointMake(emptyViewCenterX, emptyViewCenterY);
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//设置contentView
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self.contentView.ly_size = CGSizeMake(contentWidth, contentHeight);
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if (self.emptyViewIsCompleteCoverSuperView) {
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self.contentView.center = CGPointMake(emptyViewCenterX, emptyViewCenterY);
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} else {
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self.contentView.center = CGPointMake(contentWidth*0.5, contentHeight*0.5);
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}
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//子控件的centerX设置
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CGFloat centerX = self.contentView.ly_width * 0.5f;
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if (self.customView) {
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self.customView.ly_centerX = centerX;
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}else{
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_promptImageView.ly_centerX = centerX;
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_titleLabel.ly_centerX = centerX;
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_detailLabel.ly_centerX = centerX;
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_actionButton.ly_centerX = centerX;
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}
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if (self.contentViewOffset) { //有无设置偏移
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self.ly_centerY += self.contentViewOffset;
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} else if (self.contentViewY < 1000) { //有无设置Y坐标值
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self.ly_y = self.contentViewY;
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}
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//是否忽略scrollView的contentInset
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if (self.ignoreContentInset && [self.superview isKindOfClass:[UIScrollView class]]) {
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UIScrollView *scrollView = (UIScrollView *)self.superview;
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self.ly_centerY -= scrollView.contentInset.top;
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self.ly_centerX -= scrollView.contentInset.left;
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self.ly_centerY += scrollView.contentInset.bottom;
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self.ly_centerX += scrollView.contentInset.right;
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}
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}
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#pragma mark - ------------------ Setup View ------------------
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- (void)setupPromptImageView:(UIImage *)img{
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self.promptImageView.image = img;
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CGFloat imgViewWidth = img.size.width;
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CGFloat imgViewHeight = img.size.height;
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if (self.imageSize.width && self.imageSize.height) {//设置了宽高大小
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if (imgViewWidth > imgViewHeight) {//以宽为基准，按比例缩放高度
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imgViewHeight = (imgViewHeight / imgViewWidth) * self.imageSize.width;
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imgViewWidth = self.imageSize.width;
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}else{//以高为基准，按比例缩放宽度
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imgViewWidth = (imgViewWidth / imgViewHeight) * self.imageSize.height;
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imgViewHeight = self.imageSize.height;
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}
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}
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self.promptImageView.frame = CGRectMake(0, 0, imgViewWidth, imgViewHeight);
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contentWidth = self.promptImageView.ly_size.width;
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contentHeight = self.promptImageView.ly_maxY;
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}
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- (void)setupTitleLabel:(NSString *)titleStr{
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UIFont *font = self.titleLabFont.pointSize ? self.titleLabFont : kTitleLabFont;
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CGFloat fontSize = font.pointSize;
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UIColor *textColor = self.titleLabTextColor ? self.titleLabTextColor : kBlackColor;
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CGFloat titleMargin = self.titleLabMargin > 0 ? self.titleLabMargin : (contentHeight == 0 ?: subViweMargin);
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CGSize size = [self returnTextWidth:titleStr size:CGSizeMake(contentMaxWidth, fontSize + 5) font:font];
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CGFloat width = size.width;
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CGFloat height = size.height;
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self.titleLabel.frame = CGRectMake(0, contentHeight + titleMargin, width, height);
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self.titleLabel.font = font;
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self.titleLabel.text = titleStr;
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self.titleLabel.textColor = textColor;
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contentWidth = width > contentWidth ? width : contentWidth;
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contentHeight = self.titleLabel.ly_maxY;
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}
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- (void)setupDetailLabel:(NSString *)detailStr{
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UIColor *textColor = self.detailLabTextColor ? self.detailLabTextColor : kGrayColor;
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UIFont *font = self.detailLabFont.pointSize ? self.detailLabFont : kDetailLabFont;
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CGFloat fontSize = font.pointSize;
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CGFloat maxLines = self.detailLabMaxLines > 0 ? self.detailLabMaxLines : 1;
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CGFloat detailMargin = self.detailLabMargin > 0 ? self.detailLabMargin : (contentHeight == 0 ?: subViweMargin);
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self.detailLabel.font = font;
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self.detailLabel.textColor = textColor;
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self.detailLabel.text = detailStr;
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CGFloat width = 0;
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CGFloat height = 0;
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//设置行高
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if(self.detailLabLineSpacing){
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CGFloat maxHeight = maxLines * (fontSize + 5) + (maxLines-1) * self.detailLabLineSpacing;
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NSDictionary *dic = [self sizeWithAttributedString:self.detailLabel.text font:font lineSpacing:self.detailLabLineSpacing maxSize:CGSizeMake(contentMaxWidth, maxHeight)];
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NSMutableAttributedString *attStr = dic[@"attributed"];
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NSValue *sizeValue = dic[@"size"];
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CGSize size = sizeValue.CGSizeValue;
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width = size.width;
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height = size.height;
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self.detailLabel.attributedText = attStr;
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}
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else{
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CGFloat maxHeight = maxLines * (fontSize + 5);
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CGSize size = [self returnTextWidth:detailStr size:CGSizeMake(contentMaxWidth, maxHeight) font:font];//计算得出label大小
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width = size.width;
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height = size.height;
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}
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self.detailLabel.frame = CGRectMake(0, contentHeight + detailMargin, width, height);
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contentWidth = width > contentWidth ? width : contentWidth;
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contentHeight = self.detailLabel.ly_maxY;
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}
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- (void)setupActionBtn:(NSString *)btnTitle target:(id)target action:(SEL)action btnClickBlock:(LYActionTapBlock)btnClickBlock{
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UIFont *font = self.actionBtnFont.pointSize ? self.actionBtnFont : kActionBtnFont;
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CGFloat fontSize = font.pointSize;
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UIColor *titleColor = self.actionBtnTitleColor ?: kBlackColor;
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UIColor *backGColor = self.actionBtnBackGroundColor ?: [UIColor whiteColor];
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UIColor *borderColor = self.actionBtnBorderColor ?: [UIColor colorWithRed:0.8f green:0.8f blue:0.8f alpha:1.f];
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CGFloat borderWidth = self.actionBtnBorderWidth ?: 0;
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CGFloat cornerRadius = self.actionBtnCornerRadius ?: 0;
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CGFloat width = self.actionBtnWidth;
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CGFloat horiMargin = self.actionBtnHorizontalMargin;
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CGFloat height = self.actionBtnHeight;
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CGSize textSize = [self returnTextWidth:btnTitle size:CGSizeMake(contentMaxWidth, fontSize) font:font];//计算得出title文字内容大小
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if (height < textSize.height) {
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height = textSize.height + 4.f;
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}
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//按钮的宽
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CGFloat btnWidth = textSize.width;
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if (width) {
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btnWidth = width;
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} else if (horiMargin) {
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btnWidth = textSize.width + horiMargin * 2.f;
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}
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//按钮的高
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CGFloat btnHeight = height;
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btnWidth = btnWidth > contentMaxWidth ? contentMaxWidth : btnWidth;
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CGFloat btnMargin = self.actionBtnMargin > 0 ? self.actionBtnMargin : (contentHeight == 0 ?: subViweMargin);
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self.actionButton.frame = CGRectMake(0, contentHeight + btnMargin, btnWidth, btnHeight);
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[self.actionButton setTitle:btnTitle forState:UIControlStateNormal];
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self.actionButton.titleLabel.font = font;
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self.actionButton.backgroundColor = backGColor;
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if (self.actionBtnBackGroundGradientColors) [self addGradientWithView:self.actionButton gradientColors:self.actionBtnBackGroundGradientColors];
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[self.actionButton setTitleColor:titleColor forState:UIControlStateNormal];
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self.actionButton.layer.borderColor = borderColor.CGColor;
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self.actionButton.layer.borderWidth = borderWidth;
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self.actionButton.layer.cornerRadius = cornerRadius;
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//添加事件
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if (target && action) {
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[self.actionButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
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[self.actionButton addTarget:self action:@selector(actionBtnClick:) forControlEvents:UIControlEventTouchUpInside];
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}else if (btnClickBlock) {
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[self.actionButton addTarget:self action:@selector(actionBtnClick:) forControlEvents:UIControlEventTouchUpInside];
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}
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contentWidth = btnWidth > contentWidth ? btnWidth : contentWidth;
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contentHeight = self.actionButton.ly_maxY;
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}
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#pragma mark - ------------------ Event Method ------------------
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- (void)actionBtnClick:(UIButton *)sender{
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if (self.btnClickBlock) {
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self.btnClickBlock();
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}
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}
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#pragma mark - ------------------ setter ------------------
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- (void)setEmptyViewIsCompleteCoverSuperView:(BOOL)emptyViewIsCompleteCoverSuperView{
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_emptyViewIsCompleteCoverSuperView = emptyViewIsCompleteCoverSuperView;
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if (emptyViewIsCompleteCoverSuperView) {
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if (!self.backgroundColor || [self.backgroundColor isEqual:[UIColor clearColor]]) {
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self.backgroundColor = kBackgroundColor;
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}
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[self setNeedsLayout];
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}else{
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self.backgroundColor = [UIColor clearColor];
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}
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}
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#pragma mark 内容物背景视图 相关
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- (void)setSubViewMargin:(CGFloat)subViewMargin{
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if (_subViewMargin != subViewMargin) {
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_subViewMargin = subViewMargin;
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[self reSetupSubviews];
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}
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}
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- (void)setTitleLabMargin:(CGFloat)titleLabMargin{
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if (_titleLabMargin != titleLabMargin) {
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_titleLabMargin = titleLabMargin;
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[self reSetupSubviews];
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}
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}
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- (void)setDetailLabMargin:(CGFloat)detailLabMargin{
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if (_detailLabMargin != detailLabMargin) {
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_detailLabMargin = detailLabMargin;
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[self reSetupSubviews];
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}
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}
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- (void)setActionBtnMargin:(CGFloat)actionBtnMargin{
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if (_actionBtnMargin != actionBtnMargin) {
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_actionBtnMargin = actionBtnMargin;
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[self reSetupSubviews];
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}
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}
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- (void)reSetupSubviews{
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if (_promptImageView || _titleLabel || _detailLabel || _actionButton || self.customView) {//此判断的意思只是确定self是否已加载完毕
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[self setupSubviews];
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}
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}
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- (void)setContentViewOffset:(CGFloat)contentViewOffset{
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if (_contentViewOffset != contentViewOffset) {
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_contentViewOffset = contentViewOffset;
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if (_promptImageView || _titleLabel || _detailLabel || _actionButton || self.customView) {
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self.ly_centerY += self.contentViewOffset;
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}
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}
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}
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- (void)setContentViewY:(CGFloat)contentViewY{
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if (_contentViewY != contentViewY) {
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_contentViewY = contentViewY;
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if (_promptImageView || _titleLabel || _detailLabel || _actionButton || self.customView) {
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self.ly_y = self.contentViewY;
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}
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}
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}
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#pragma mark 提示图Image 相关
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- (void)setImageSize:(CGSize)imageSize{
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if (_imageSize.width != imageSize.width || _imageSize.height != imageSize.height) {
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_imageSize = imageSize;
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if (_promptImageView) {
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[self setupSubviews];
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}
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}
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}
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#pragma mark 描述Label 相关
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- (void)setTitleLabFont:(UIFont *)titleLabFont{
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if (_titleLabFont != titleLabFont) {
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_titleLabFont = titleLabFont;
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if (_titleLabel) {
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[self setupSubviews];
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}
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}
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}
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- (void)setTitleLabTextColor:(UIColor *)titleLabTextColor{
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if (_titleLabTextColor != titleLabTextColor) {
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_titleLabTextColor = titleLabTextColor;
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if (_titleLabel) {
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_titleLabel.textColor = titleLabTextColor;
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}
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}
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}
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#pragma mark 详细描述Label 相关
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- (void)setDetailLabFont:(UIFont *)detailLabFont{
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if (_detailLabFont != detailLabFont) {
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_detailLabFont = detailLabFont;
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if (_detailLabel) {
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[self setupSubviews];
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}
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}
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}
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- (void)setDetailLabMaxLines:(NSInteger)detailLabMaxLines{
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if (_detailLabMaxLines != detailLabMaxLines) {
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_detailLabMaxLines = detailLabMaxLines;
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if (_detailLabel) {
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[self setupSubviews];
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}
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}
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}
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- (void)setDetailLabTextColor:(UIColor *)detailLabTextColor{
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if (_detailLabTextColor != detailLabTextColor) {
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_detailLabTextColor = detailLabTextColor;
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if (_detailLabel) {
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_detailLabel.textColor = detailLabTextColor;
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}
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}
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}
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- (void)setDetailLabLineSpacing:(NSInteger)detailLabLineSpacing{
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if (_detailLabLineSpacing != detailLabLineSpacing) {
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_detailLabLineSpacing = detailLabLineSpacing;
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if (_detailLabel) {
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[self setupSubviews];
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}
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}
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}
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#pragma mark Button 相关
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//////////大小位置相关-需要重新布局
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- (void)setActionBtnFont:(UIFont *)actionBtnFont{
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if (_actionBtnFont != actionBtnFont) {
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_actionBtnFont = actionBtnFont;
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if (_actionButton) {
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[self setupSubviews];
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnHeight:(CGFloat)actionBtnHeight{
|
||
if (_actionBtnHeight != actionBtnHeight) {
|
||
_actionBtnHeight = actionBtnHeight;
|
||
|
||
if (_actionButton) {
|
||
[self setupSubviews];
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnWidth:(CGFloat)actionBtnWidth{
|
||
if (_actionBtnWidth != actionBtnWidth) {
|
||
_actionBtnWidth = actionBtnWidth;
|
||
|
||
if (_actionButton) {
|
||
[self setupSubviews];
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnHorizontalMargin:(CGFloat)actionBtnHorizontalMargin{
|
||
if (_actionBtnHorizontalMargin != actionBtnHorizontalMargin) {
|
||
_actionBtnHorizontalMargin = actionBtnHorizontalMargin;
|
||
|
||
if (_actionButton) {
|
||
[self setupSubviews];
|
||
}
|
||
}
|
||
}
|
||
//////////其他相关-直接赋值
|
||
- (void)setActionBtnCornerRadius:(CGFloat)actionBtnCornerRadius{
|
||
if (_actionBtnCornerRadius != actionBtnCornerRadius) {
|
||
_actionBtnCornerRadius = actionBtnCornerRadius;
|
||
|
||
if (_actionButton) {
|
||
_actionButton.layer.cornerRadius = actionBtnCornerRadius;
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnBorderWidth:(CGFloat)actionBtnBorderWidth{
|
||
if (actionBtnBorderWidth != _actionBtnBorderWidth) {
|
||
_actionBtnBorderWidth = actionBtnBorderWidth;
|
||
|
||
if (_actionButton) {
|
||
_actionButton.layer.borderWidth = actionBtnBorderWidth;
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnBorderColor:(UIColor *)actionBtnBorderColor{
|
||
if (_actionBtnBorderColor != actionBtnBorderColor) {
|
||
_actionBtnBorderColor = actionBtnBorderColor;
|
||
|
||
if (_actionButton) {
|
||
_actionButton.layer.borderColor = actionBtnBorderColor.CGColor;
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnTitleColor:(UIColor *)actionBtnTitleColor{
|
||
if (_actionBtnTitleColor != actionBtnTitleColor) {
|
||
_actionBtnTitleColor = actionBtnTitleColor;
|
||
|
||
if (_actionButton) {
|
||
[_actionButton setTitleColor:actionBtnTitleColor forState:UIControlStateNormal];
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnBackGroundColor:(UIColor *)actionBtnBackGroundColor{
|
||
if (actionBtnBackGroundColor != _actionBtnBackGroundColor) {
|
||
_actionBtnBackGroundColor = actionBtnBackGroundColor;
|
||
|
||
if (_actionButton) {
|
||
[_actionButton setBackgroundColor:actionBtnBackGroundColor];
|
||
}
|
||
}
|
||
}
|
||
- (void)setActionBtnBackGroundGradientColors:(NSArray<UIColor *> *)actionBtnBackGroundGradientColors
|
||
{
|
||
if (actionBtnBackGroundGradientColors.count >= 2) {
|
||
_actionBtnBackGroundGradientColors = [actionBtnBackGroundGradientColors subarrayWithRange:NSMakeRange(0, 2)];
|
||
if (_actionButton) {
|
||
[self addGradientWithView:_actionButton gradientColors:_actionBtnBackGroundGradientColors];
|
||
}
|
||
}
|
||
}
|
||
|
||
#pragma mark - ------------------ getter ------------------
|
||
- (UIImageView *)promptImageView{
|
||
if (!_promptImageView) {
|
||
_promptImageView = [[UIImageView alloc] init];
|
||
_promptImageView.contentMode = UIViewContentModeScaleAspectFit;
|
||
[self.contentView addSubview:_promptImageView];
|
||
}
|
||
return _promptImageView;
|
||
}
|
||
- (UILabel *)titleLabel{
|
||
if (!_titleLabel) {
|
||
_titleLabel = [[UILabel alloc] init];
|
||
_titleLabel.textAlignment = NSTextAlignmentCenter;
|
||
[self.contentView addSubview:_titleLabel];
|
||
}
|
||
return _titleLabel;
|
||
}
|
||
- (UILabel *)detailLabel{
|
||
if (!_detailLabel) {
|
||
_detailLabel = [[UILabel alloc] init];
|
||
_detailLabel.textAlignment = NSTextAlignmentCenter;
|
||
_detailLabel.numberOfLines = 0;
|
||
[self.contentView addSubview:_detailLabel];
|
||
}
|
||
return _detailLabel;
|
||
}
|
||
- (UIButton *)actionButton{
|
||
if (!_actionButton) {
|
||
_actionButton = [[UIButton alloc] init];
|
||
_actionButton.layer.masksToBounds = YES;
|
||
[self.contentView addSubview:_actionButton];
|
||
}
|
||
return _actionButton;
|
||
}
|
||
|
||
#pragma mark - ------------------ Help Method ------------------
|
||
- (CGSize)returnTextWidth:(NSString *)text size:(CGSize)size font:(UIFont *)font{
|
||
CGSize textSize = [text boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : font} context:nil].size;
|
||
return textSize;
|
||
}
|
||
|
||
- (NSDictionary *)sizeWithAttributedString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing maxSize:(CGSize)maxSize{
|
||
|
||
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
|
||
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
|
||
paragraphStyle.lineSpacing = lineSpacing; // 设置行间距
|
||
paragraphStyle.alignment = NSTextAlignmentCenter;
|
||
|
||
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:string attributes:@{NSParagraphStyleAttributeName: paragraphStyle, NSFontAttributeName:font}];
|
||
|
||
CGSize size = [attributedStr boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil].size;
|
||
|
||
NSDictionary *dic = @{
|
||
@"attributed":attributedStr,
|
||
@"size": [NSValue valueWithCGSize:size]
|
||
};
|
||
return dic;
|
||
}
|
||
|
||
- (void)addGradientWithView:(UIView *)view gradientColors:(NSArray<UIColor *> *)gradientColors
|
||
{
|
||
[view setBackgroundColor:[UIColor clearColor]];
|
||
|
||
NSArray *colors = @[(__bridge id)[gradientColors.firstObject CGColor],
|
||
(__bridge id)[gradientColors.lastObject CGColor]];
|
||
CAGradientLayer *layer = [CAGradientLayer layer];
|
||
layer.colors = colors;
|
||
layer.locations = @[@0.3, @0.5, @1.0];
|
||
layer.startPoint = CGPointMake(0, 0);
|
||
layer.endPoint = CGPointMake(1.0, 0);
|
||
layer.frame = view.bounds;
|
||
layer.masksToBounds = YES;
|
||
layer.cornerRadius = view.frame.size.height * 0.5;
|
||
|
||
CALayer *firstLayer = self.layer.sublayers.firstObject;
|
||
if ([firstLayer isKindOfClass:[CAGradientLayer class]]) {
|
||
[view.layer replaceSublayer:firstLayer with:layer];
|
||
} else {
|
||
[view.layer insertSublayer:layer atIndex:0];
|
||
}
|
||
}
|
||
|
||
@end
|