你能将UIGestureRecognizer附加到多个视图吗？

Question

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapTapTap:)];
[self.view1 addGestureRecognizer:tapGesture];
[self.view2 addGestureRecognizer:tapGesture];
[tapGesture release];

在上面的代码中,只view2识别了点击.如果我注释掉第三行,那么点击就会view1被识别出来.如果我是对的,你只能使用一次手势识别器,我不确定这是一个bug还是只需要一些文档.

Answer 1

A UIGestureRecognizer将与单个视图一起使用.我同意文件不稳定.这UIGestureRecognizer有一个view属性让它离开:

视图

手势识别器附加到的视图.(只读)

@property(非原子,只读)UIView*视图

讨论使用addGestureRecognizer:方法将手势识别器附加(或添加)到UIView对象.

Answer 2

我使用下面的方法绕过它.

for (UIButton *aButton in myButtons) {

            UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
            longPress.minimumPressDuration=1.0;
            [aButton addGestureRecognizer:longPress];
            [longPress release];

}

然后在我的handleLongPress方法中,我只是设置一个UIButton等于手势识别器的视图,并根据该按钮分支我做的事情

- (void)handleLongPress:(UILongPressGestureRecognizer*)gesture {
    if ( gesture.state == UIGestureRecognizerStateEnded ) {
        UIButton *whichButton=(UIButton *)[gesture view];
        selectedButton=(UIButton *)[gesture view];
    ....
}

Answer 3

对于Swift 3,万一有人要求:基于上面的Bhavik Rathod答案.

 func setGestureRecognizer() -> UIPanGestureRecognizer {

        var panRecognizer = UIPanGestureRecognizer()

        panRecognizer = UIPanGestureRecognizer (target: self, action: #selector(pan(panGesture:)))
        panRecognizer.minimumNumberOfTouches = 1
        panRecognizer.maximumNumberOfTouches = 1
        return panRecognizer
    }

        ///set the recognize in multiple views
        view1.addGestureRecognizer(setGestureRecognizer())
        view2.addGestureRecognizer(setGestureRecognizer())

Answer 4

我们可以做这样的事情,简单易行

1)在控制器中创建如下函数(此函数将返回GestureRecognizer)

-(UITapGestureRecognizer*)setRecognizer{
     UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(openProfile)];
     [gestureRecognizer setNumberOfTapsRequired:1];
     return gestureRecognizer;
}

2)现在在多个视图中设置此识别器

[self.view1 addGestureRecognizer:[self setRecognizer]]; 
[self.view2 addGestureRecognizer:[self setRecognizer]];

Answer 5

不,你不应该将手势识别器附加到多个视图.

Apple文档中有这些明确的信息:

手势识别器附加到视图中

每个手势识别器都与一个视图相关联.相比之下,视图可以具有多个手势识别器,因为单个视图可以响应许多不同的手势.要使手势识别器识别特定视图中发生的触摸,您必须将手势识别器附加到该视图.

适用于iOS的事件处理指南 - 手势识别器 Apple Developer Library

虽然其他人提到他们可能在某些情况下工作,但它显然违反了文档,并且可能会在未来的任何iOS版本中发生变化.

您可以做的是为要监视的视图添加单独的手势识别器,他们可以共享一个共同的操作.