keyboard/keyBoard/Class/Guard/V/KBKeyboardMaskView.m

//
//  KBKeyboardMaskView.m
//  keyBoard
//
//  Created by Mac on 2025/11/27.
//

#import "KBKeyboardMaskView.h"

@interface KBKeyboardMaskView ()
@property (nonatomic, strong) UIButton *backButton;
@property (nonatomic, strong) FLAnimatedImageView *gifView;
@property (nonatomic, assign) CGFloat keyboardHeight;
@end

@implementation KBKeyboardMaskView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (!self) return nil;
    self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];
    self.userInteractionEnabled = YES;

    // 返回按钮
    _backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *backImg = [UIImage imageNamed:@"close_white2_icon"];
    [_backButton setImage:backImg forState:UIControlStateNormal];
    [self addSubview:_backButton];

    [_backButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self).offset(9);
        if (@available(iOS 11.0, *)) {
            make.top.equalTo(self.mas_safeAreaLayoutGuideTop).offset(4);
        } else {
            make.top.equalTo(self).offset(40);
        }
        make.width.height.mas_equalTo(40);
    }];

    // GIF 区域
    _gifView = [FLAnimatedImageView new];
    _gifView.contentMode = UIViewContentModeScaleAspectFit;
    _gifView.clipsToBounds = YES;
    [self addSubview:_gifView];

    // 尺寸固定：宽=屏幕宽，高=300；位置在 layoutSubviews 里根据键盘高度动态计算
    CGFloat screenW = UIScreen.mainScreen.bounds.size.width;
    [_gifView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self);
        make.width.mas_equalTo(KBFit(316));
        make.height.mas_equalTo(KBFit(209));
        // 竖直方向不在这里约束，由 layoutSubviews 手动布局
    }];

    // 整个蒙层点击：激活输入框
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTapMask:)];
    [self addGestureRecognizer:tap];

    // 加载 GIF 资源（占位名，可按需更换为实际文件名）
    NSString *gifPath = [[NSBundle mainBundle] pathForResource:@"kb_guide_keyboard" ofType:@"gif"];
    if (gifPath.length > 0) {
        NSData *data = [NSData dataWithContentsOfFile:gifPath];
        if (data.length > 0) {
            FLAnimatedImage *img = [FLAnimatedImage animatedImageWithGIFData:data];
            _gifView.animatedImage = img;
        }
    }

    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];

    // 根据键盘高度，保证 GIF 不被遮挡：
    // - 无键盘：居中显示；
    // - 有键盘：底部距离键盘上方 20pt，若空间不足则向上顶到顶部预留的 safe 区域。
    CGFloat viewH = CGRectGetHeight(self.bounds);
    CGFloat gifH = 300.0;
    CGFloat topMargin = 80.0; // 预留给返回按钮和标题等
    CGFloat bottomMargin = 20.0;

    CGFloat y = 0;
    if (self.keyboardHeight <= 0) {
        // 无键盘：垂直居中
        y = (viewH - gifH) * 0.5;
        if (y < topMargin) y = topMargin;
    } else {
        CGFloat maxBottom = viewH - self.keyboardHeight - bottomMargin;
        y = maxBottom - gifH;
        if (y < topMargin) y = topMargin;
    }

    CGRect frame = self.gifView.frame;
    frame.origin.y = y;
    self.gifView.frame = frame;
}

- (void)onTapMask:(UITapGestureRecognizer *)gr {
    CGPoint p = [gr locationInView:self];
    // 如果点在返回按钮区域内，则不走 tapHandler（交由按钮自己的事件处理）
    if (CGRectContainsPoint(self.backButton.frame, p)) {
        return;
    }
    if (self.tapHandler) {
        self.tapHandler();
    }
}

- (void)updateForKeyboardHeight:(CGFloat)kbHeight
                       duration:(NSTimeInterval)duration
                          curve:(UIViewAnimationOptions)curve {
    self.keyboardHeight = MAX(kbHeight, 0);
    // 触发布局刷新，以便在 layoutSubviews 里根据最新键盘高度重算 gifView 的 Y 值
    [self setNeedsLayout];
    [UIView animateWithDuration:duration
                          delay:0
                        options:curve
                     animations:^{
                         [self layoutIfNeeded];
                     }
                     completion:nil];
}

@end