UIButton块相当于addTarget:action:forControlEvents:method? [英] UIButton block equivalent to addTarget:action:forControlEvents: method?
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问题描述
我环顾四周,但在互联网上找不到这个,也没有找到Apple文档中的任何地方,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.
但是有一个iOS4块等效的API:
But is there a iOS4 blocks equivalent API to:
[button addTarget:self action:@selector(tappy:) forControlEvents:UIControlEventTouchUpInside];
我想这可以用类别来实现,但是由于极端懒惰:)
I suppose this could be implemented using a category, but would rather not write this myself due to extreme laziness :)
这样的事情会很棒:
[button handleControlEvent:UIControlEventTouchUpInside withBlock:^ { NSLog(@"I was tapped!"); }];
推荐答案
我刚刚实现了这一点。它的工作就像一个魅力!
I just implemented this. It work's like a charm!
它甚至都不难。
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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