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