UIButton 块相当于 addTarget:action:forControlEvents: 方法? [英] UIButton block equivalent to addTarget:action:forControlEvents: method?

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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