iphone - 如何将手势识别器添加到多个按钮？

Question

您好，我正在尝试向“UIButton”添加手势识别器。当我这样做时:

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
[self.LeftBottomSpaceBtn addGestureRecognizer:singleTap];
[singleTap requireGestureRecognizerToFail:doubleTap];
[singleTap release];

它工作正常，但是当我尝试将这个手势添加到多个按钮时它不起作用:

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
[self.LeftBottomSpaceBtn addGestureRecognizer:singleTap];
[self.LeftUpSpaceBtn addGestureRecognizer:singleTap];
[self.RightBUpSpaceBtn addGestureRecognizer:singleTap];
[self.LeftReturnBtn addGestureRecognizer:singleTap];
[self.RightReturnBtn addGestureRecognizer:singleTap];
[self.DeleteBtn addGestureRecognizer:singleTap];
[self.CapsBtn addGestureRecognizer:singleTap];
[singleTap requireGestureRecognizerToFail:doubleTap];
[singleTap release];

那么我如何才能像添加“longPress”和“doubleTap”一样向多个按钮添加相同的手势？

Answer 1

我建议如下:

NSMutableSet *buttons = [[NSMutableSet alloc] init];

[buttons addObject: self.LeftBottomSpaceBtn];
[buttons addObject: self.LeftUpSpaceBtn];
[buttons addObject: self.RightBUpSpaceBtn];
[buttons addObject: self.LeftReturnBtn];
[buttons addObject: self.RightReturnBtn];
[buttons addObject: self.DeleteBtn];
[buttons addObject: self.CapsBtn];

for(UIButton *button in buttons)
{
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    [button addGestureRecognizer:singleTap];
    [singleTap requireGestureRecognizerToFail:doubleTap];
    [singleTap release];
}

如果将集合保存为变量，则还可以对所有按钮执行其他操作，例如释放所有按钮并更改所有背景颜色，而无需单独调用它们。

您可能还需要为每个按钮制作单独的双重预识别器。