116 lines
4.3 KiB
Objective-C
116 lines
4.3 KiB
Objective-C
// 代码地址: https://github.com/CoderMJLee/MJRefresh
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#import <UIKit/UIKit.h>
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#import <objc/message.h>
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#import <objc/runtime.h>
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// 弱引用
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#define MJWeakSelf __weak typeof(self) weakSelf = self;
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// 日志输出
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#ifdef DEBUG
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#define MJRefreshLog(...) NSLog(__VA_ARGS__)
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#else
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#define MJRefreshLog(...)
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#endif
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// 过期提醒
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#define MJRefreshDeprecated(DESCRIPTION) __attribute__((deprecated(DESCRIPTION)))
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// 运行时objc_msgSend
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#define MJRefreshMsgSend(...) ((void (*)(void *, SEL, UIView *))objc_msgSend)(__VA_ARGS__)
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#define MJRefreshMsgTarget(target) (__bridge void *)(target)
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// RGB颜色
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#define MJRefreshColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
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// 文字颜色
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#define MJRefreshLabelTextColor MJRefreshColor(90, 90, 90)
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// 字体大小
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#define MJRefreshLabelFont [UIFont boldSystemFontOfSize:14]
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// 常量
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UIKIT_EXTERN const CGFloat MJRefreshLabelLeftInset;
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UIKIT_EXTERN const CGFloat MJRefreshHeaderHeight;
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UIKIT_EXTERN const CGFloat MJRefreshFooterHeight;
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UIKIT_EXTERN const CGFloat MJRefreshTrailWidth;
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UIKIT_EXTERN const CGFloat MJRefreshFastAnimationDuration;
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UIKIT_EXTERN const CGFloat MJRefreshSlowAnimationDuration;
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UIKIT_EXTERN NSString *const MJRefreshKeyPathContentOffset;
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UIKIT_EXTERN NSString *const MJRefreshKeyPathContentSize;
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UIKIT_EXTERN NSString *const MJRefreshKeyPathContentInset;
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UIKIT_EXTERN NSString *const MJRefreshKeyPathPanState;
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UIKIT_EXTERN NSString *const MJRefreshHeaderLastUpdatedTimeKey;
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UIKIT_EXTERN NSString *const MJRefreshHeaderIdleText;
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UIKIT_EXTERN NSString *const MJRefreshHeaderPullingText;
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UIKIT_EXTERN NSString *const MJRefreshHeaderRefreshingText;
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UIKIT_EXTERN NSString *const MJRefreshTrailerIdleText;
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UIKIT_EXTERN NSString *const MJRefreshTrailerPullingText;
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UIKIT_EXTERN NSString *const MJRefreshAutoFooterIdleText;
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UIKIT_EXTERN NSString *const MJRefreshAutoFooterRefreshingText;
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UIKIT_EXTERN NSString *const MJRefreshAutoFooterNoMoreDataText;
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UIKIT_EXTERN NSString *const MJRefreshBackFooterIdleText;
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UIKIT_EXTERN NSString *const MJRefreshBackFooterPullingText;
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UIKIT_EXTERN NSString *const MJRefreshBackFooterRefreshingText;
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UIKIT_EXTERN NSString *const MJRefreshBackFooterNoMoreDataText;
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UIKIT_EXTERN NSString *const MJRefreshHeaderLastTimeText;
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UIKIT_EXTERN NSString *const MJRefreshHeaderDateTodayText;
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UIKIT_EXTERN NSString *const MJRefreshHeaderNoneLastDateText;
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UIKIT_EXTERN NSString *const MJRefreshDidChangeLanguageNotification;
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// 状态检查
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#define MJRefreshCheckState \
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MJRefreshState oldState = self.state; \
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if (state == oldState) return; \
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[super setState:state];
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// 异步主线程执行，不强持有Self
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#define MJRefreshDispatchAsyncOnMainQueue(x) \
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__weak typeof(self) weakSelf = self; \
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dispatch_async(dispatch_get_main_queue(), ^{ \
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typeof(weakSelf) self = weakSelf; \
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{x} \
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});
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/// 替换方法实现
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/// @param _fromClass 源类
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/// @param _originSelector 源类的 Selector
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/// @param _toClass 目标类
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/// @param _newSelector 目标类的 Selector
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CG_INLINE BOOL MJRefreshExchangeImplementations(
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Class _fromClass, SEL _originSelector,
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Class _toClass, SEL _newSelector) {
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if (!_fromClass || !_toClass) {
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return NO;
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}
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Method oriMethod = class_getInstanceMethod(_fromClass, _originSelector);
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Method newMethod = class_getInstanceMethod(_toClass, _newSelector);
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if (!newMethod) {
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return NO;
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}
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BOOL isAddedMethod = class_addMethod(_fromClass, _originSelector,
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method_getImplementation(newMethod),
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method_getTypeEncoding(newMethod));
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if (isAddedMethod) {
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// 如果 class_addMethod 成功了，说明之前 fromClass 里并不存在 originSelector，所以要用一个空的方法代替它，以避免 class_replaceMethod 后，后续 toClass 的这个方法被调用时可能会 crash
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IMP emptyIMP = imp_implementationWithBlock(^(id selfObject) {});
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IMP oriMethodIMP = method_getImplementation(oriMethod) ?: emptyIMP;
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const char *oriMethodTypeEncoding = method_getTypeEncoding(oriMethod) ?: "v@:";
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class_replaceMethod(_toClass, _newSelector, oriMethodIMP, oriMethodTypeEncoding);
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} else {
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method_exchangeImplementations(oriMethod, newMethod);
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}
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return YES;
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}
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