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MJRefresh中runtime和方法调配的使用
@implementation NSObject (MJRefresh)+ (void)exchangeInstanceMethod1:(SEL)method1 method2:(SEL)method2
{
method_exchangeImplementations(class_getInstanceMethod(self, method1), class_getInstanceMethod(self, method2));
}+ (void)exchangeClassMethod1:(SEL)method1 method2:(SEL)method2
{
method_exchangeImplementations(class_getClassMethod(self, method1), class_getClassMethod(self, method2));
}@end@implementation UIScrollView (MJRefresh)#pragma mark - header
static const char MJRefreshHeaderKey = '\0';
- (void)setMj_header:(MJRefreshHeader *)mj_header
{
if (mj_header != self.mj_header) {
// 删除旧的，添加新的
[self.mj_header removeFromSuperview];
[self insertSubview:mj_header atIndex:0];
// 存储新的
[self willChangeValueForKey:@"mj_header"];
// KVO
objc_setAssociatedObject(self, &MJRefreshHeaderKey,
mj_header, OBJC_ASSOCIATION_ASSIGN);
[self didChangeValueForKey:@"mj_header"];
// KVO
}
}- (MJRefreshHeader *)mj_header
{
return objc_getAssociatedObject(self, &MJRefreshHeaderKey);
}#pragma mark - footer
static const char MJRefreshFooterKey = '\0';
- (void)setMj_footer:(MJRefreshFooter *)mj_footer
{
if (mj_footer != self.mj_footer) {
// 删除旧的，添加新的
[self.mj_footer removeFromSuperview];
[self addSubview:mj_footer];
// 存储新的
[self willChangeValueForKey:@"mj_footer"];
// KVO
objc_setAssociatedObject(self, &MJRefreshFooterKey,
mj_footer, OBJC_ASSOCIATION_ASSIGN);
[self didChangeValueForKey:@"mj_footer"];
// KVO
}
}- (MJRefreshFooter *)mj_footer
{
return objc_getAssociatedObject(self, &MJRefreshFooterKey);
}#pragma mark - other
- (NSInteger)mj_totalDataCount
{
NSInteger totalCount = 0;
if ([self isKindOfClass:[UITableView class]]) {
UITableView *tableView = (UITableView *)self;
for (NSInteger section = 0;
section
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