iphone - UIButton block 相当于 addTarget :action:forControlEvents: method?

Question

我环顾四周，但在互联网上和苹果文档中都找不到这个，所以我猜它不存在。

但是 iOS4 是否有一个等效的 API 可以:

[button addTarget:self action:@selector(tappy:) forControlEvents:UIControlEventTouchUpInside];

我想这可以使用类别来实现，但由于极端懒惰，我宁愿不自己编写这个:)

像这样的事情会很棒:

[button handleControlEvent:UIControlEventTouchUpInside withBlock:^ { NSLog(@"I was tapped!"); }];

Answer 1

我刚刚实现了这个。它就像一个魅力!

而且这并不难。

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