ios fix UIRefreshControl bug

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NS_CLASS_AVAILABLE_IOS(6_0)   UIRefreshControl 有個毛病有時會出bug  動畫下拉就不動了，這裡給出修複處理：

@interface UICollectionView (FixRefreshControlJump)@end

#import "UICollectionView+FixRefreshControlJump.h"#import <objc/runtime.h>@implementation UICollectionView (FixRefreshControlJump)+ (void)load{    Method originMethod = class_getInstanceMethod([UICollectionView class], @selector(setContentInset:));    Method newMethod = class_getInstanceMethod([UICollectionView class], @selector(setNewContentInset:));    method_exchangeImplementations(originMethod, newMethod);        UIRefreshControl}- (void)setNewContentInset:(UIEdgeInsets)contentInset{    if (self.tracking) {        CGFloat diff = contentInset.top - self.contentInset.top;        CGPoint translation = [self.panGestureRecognizer translationInView:self];        translation.y -= diff * 3.0 / 2.0;        [self.panGestureRecognizer setTranslation:translation inView:self];    }    if ([self respondsToSelector:@selector(setNewContentInset:)]) {        [self setNewContentInset:contentInset];    }}@end

通過 method_exchangeImplementations swzing的方式處理問題

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http://www.cnblogs.com/kesalin/archive/2012/01/05/objc_method_swizzling.html