点击手势识别器 - 哪个对象被点击？

Question

我是手势识别器的新手所以也许这个问题听起来很愚蠢:我正在为一堆UIViews分配轻拍手势识别器.在该方法中,有可能找出以某种方式点击它们中的哪一个,或者我是否需要使用点击屏幕上的点找到它？

for (NSUInteger i=0; i<42; i++) {
        float xMultiplier=(i)%6;
        float yMultiplier= (i)/6;
        float xPos=xMultiplier*imageWidth;
        float yPos=1+UA_TOP_WHITE+UA_TOP_BAR_HEIGHT+yMultiplier*imageHeight;
        UIView *greyRect=[[UIView alloc]initWithFrame:CGRectMake(xPos, yPos, imageWidth, imageHeight)];
        [greyRect setBackgroundColor:UA_NAV_CTRL_COLOR];

        greyRect.layer.borderColor=[UA_NAV_BAR_COLOR CGColor];
        greyRect.layer.borderWidth=1.0f;
        greyRect.userInteractionEnabled=YES;
        [greyGridArray addObject:greyRect];
        [self.view addSubview:greyRect];
        NSLog(@"greyGrid: %i: %@", i, greyRect);

        //make them touchable
        UITapGestureRecognizer *letterTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(highlightLetter)];
        letterTapRecognizer.numberOfTapsRequired = 1;
        [greyRect addGestureRecognizer:letterTapRecognizer];
    }

Answer 1

highlightLetter:使用参数定义目标选择器()

UITapGestureRecognizer *letterTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(highlightLetter:)];

然后你就可以看到了

- (void)highlightLetter:(UITapGestureRecognizer*)sender {
     UIView *view = sender.view; 
     NSLog(@"%d", view.tag);//By tag, you can find out where you had tapped. 
}

Answer 2

一年来一直在问这个问题,但仍然是某人.

声明UITapGestureRecognizer特定视图时将标记指定为

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gestureHandlerMethod:)];
[yourGestureEnableView addGestureRecognizer:tapRecognizer];
yourGestureEnableView.tag=2;

并在您的处理程序中这样做

-(void)gestureHandlerMethod:(UITapGestureRecognizer*)sender {
    if(sender.view.tag == 2) {
        // do something here
    }
}

Answer 3

这是Swift 3的更新,也是Mani答案的补充.我建议sender.view结合使用标记UIViews(或其他元素,取决于你想要跟踪的内容)来获得更加"先进"的方法.

1. 将UITapGestureRecognizer添加到例如UIButton(您也可以将其添加到UIViews等)或者数组中的一大堆项目,其中包含for循环和第二个用于轻击手势的数组.

    let yourTapEvent = UITapGestureRecognizer(target: self, action: #selector(yourController.yourFunction)) 
    yourObject.addGestureRecognizer(yourTapEvent) // adding the gesture to your object

2. 在同一个testController中定义函数(这是View Controller的名称).我们将在这里使用标签 - 标签是Int ID,您可以将其添加到UIView中yourButton.tag = 1.如果你有一个动态的元素列表,比如一个数组你可以做一个for循环,它遍历你的数组并添加一个标签,它会逐渐增加

   func yourFunction(_ sender: AnyObject) {
       let yourTag = sender.view!.tag // this is the tag of your gesture's object
       // do whatever you want from here :) e.g. if you have an array of buttons instead of just 1:
       for button in buttonsArray {
         if(button.tag == yourTag) {
           // do something with your button
         }
       }
   }
   

所有这一切的原因是因为当与#selector一起使用时,你不能为你的函数传递更多的参数.

如果您有一个更复杂的UI结构,并且您希望获得附加到您的点击手势的项目的父标记,您可以使用let yourAdvancedTag = sender.view!.superview?.tag例如在UIView内获取按下按钮的UIView标记; 可用于缩略图+按钮列表等.

Answer 4

在 Swift 中使用此代码

func tappGeastureAction(sender: AnyObject) {
    if let tap = sender as? UITapGestureRecognizer {
        let point = tap.locationInView(locatedView)
        if filterView.pointInside(point, withEvent: nil) == true {
            // write your stuff here                
        }
    }
}

Answer 5

很快就很简单

在 ViewDidLoad() 函数中编写此代码

let tap = UITapGestureRecognizer(target: self, action: #selector(tapHandler(gesture:)))
    tap.numberOfTapsRequired = 2
    tapView.addGestureRecognizer(tap)

Handler 部分这可以在viewDidLoad 或viewDidLoad 之外，batter 放在扩展中

@objc func tapHandler(gesture: UITapGestureRecognizer) {
    currentGestureStates.text = "Double Tap"
} 

在这里，我只是通过打印输出来测试代码，如果你想做一个动作，你可以做任何你想做的事情或者更多的练习和阅读