iphone – 如何在多个按钮上添加手势识别器？

发布时间：2020-12-14 19:22:30 所属栏目：百科来源：网络整理

导读：嗨,我正在尝试为’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];[

嗨,我正在尝试为’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,但当我尝试将此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];

那么我怎么能像添加’longPress’和’doubleTap’一样将相同的手势添加到多个按钮？

解决方法

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,您也可以为所有按钮执行其他操作,例如释放所有按钮并更改所有backgroundColors,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识别器.

（编辑：李大同）

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