本文介绍了UIButton 块相当于 addTarget:action:forControlEvents: 方法?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我环顾四周，但在互联网上找不到这个，也没有在 Apple 文档的任何地方找到，所以我猜它不存在.
I looked around, but couldn't find this on the internet, nor anywhere in the Apple docs, so I'm guessing it doesn't exist.
但是有没有 iOS4 块等效的 API:
But is there a iOS4 blocks equivalent API to:
[button addTarget:self action:@selector(tappy:) forControlEvents:UIControlEventTouchUpInside];
我想这可以使用一个类别来实现，但由于极端懒惰，我不想自己写这个:)
I suppose this could be implemented using a category, but would rather not write this myself due to extreme laziness :)
这样的东西会很棒:
[button handleControlEvent:UIControlEventTouchUpInside withBlock:^ { NSLog(@"I was tapped!"); }];
推荐答案
我刚刚实现了这个.它就像一个魅力！
I just implemented this. It work's like a charm!
这并不难.
typedef void (^ActionBlock)();
@interface UIBlockButton : UIButton {
ActionBlock _actionBlock;
}
-(void) handleControlEvent:(UIControlEvents)event
withBlock:(ActionBlock) action;
@end
@implementation UIBlockButton
-(void) handleControlEvent:(UIControlEvents)event
withBlock:(ActionBlock) action
{
_actionBlock = action;
[self addTarget:self action:@selector(callActionBlock:) forControlEvents:event];
}
-(void) callActionBlock:(id)sender{
_actionBlock();
}
@end
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