滚动视图内的多个imageview上的轻击手势不触发事件，只有第一个imageview轻击手势有效吗？

Question

方案是我有一个imageview，它已添加到一个滚动视图中，然后在每个imageview上添加了手势，但只有第一个imageview触发事件。

尝试过以下方法：

1.创建imageview扩展

extension UIImageView {
  public func openMenu() {
    let tapGestureRecognizer = UITapGestureRecognizer(target:self, action:Selector("handleTapGesture:"))
    //mImg.addGestureRecognizer()
    self.addGestureRecognizer(tapGestureRecognizer)
    print("open")
  }
}

2.在循环中添加了轻按手势（在滚动视图中添加了imageview的方式与添加tapgesture的方式相同）

//the loop go till all images will load
for var index = 0; index < imagesName.count; index++ {
  let mImg: UIImageView = UIImageView()          
  let pDict = homePageProductArr[index] as NSDictionary

  //Create a UIVIEW 
  let containerView:UIView = UIView(frame: CGRect(x: 0, y: 0, width: 80, height: 100))
  let nameLabel:UILabel = UILabel(frame:CGRect(x: xOffset+20, y: 85, width: 100, height: 20))
  nameLabel.text = (pDict.objectForKey("CategoryName") as! String)
  nameLabel.font = UIFont(name: "Helvetica Neue", size: 10.0)
  containerView.addSubview(nameLabel)

  let tapMenuCategoryImageTGR = UITapGestureRecognizer(target: self, action: Selector("handleTapGesture:"))
  containerView.addGestureRecognizer(tapMenuCategoryImageTGR)

  // make the imageview object because in scrollview we need image
  mImg.frame = CGRectMake(5 + xOffset, 0, 80, 80)
  // the offset represent the values, used so that topleft for each image will
  // change with(5+xOffset, 0)and the bottomright(160, 110)
  //mImg.image = UIImage(named: imagesName[index])
  mImg.imageFromUrl(imagesName[index])
  //mImg.imageFromServerURL(imagesName[index])
  //Creating Circular Image
  //mImg.layer.borderWidth = 1
  mImg.layer.masksToBounds = true
  mImg.layer.borderColor = UIColor.whiteColor().CGColor
  mImg.layer.cornerRadius = mImg.frame.height/2
  mImg.clipsToBounds = false
  mImg.openMenu()
  mImg.userInteractionEnabled = true
  mImg.addGestureRecognizer = tapMenuCategoryImageTGR

  // The image will put on the img object
  images.insert(mImg, atIndex: index)
  //Put the img object at the images array which is mutable array
  scrollview.contentSize = CGSizeMake(120 + xOffset, 110)
  //scroll view size show after 125 width the scroll view enabled 
  scrollview.addSubview(images[index] as! UIView)
  //set images on scroll view
  xOffset += 100
}

请就此分享您的建议。

Answer 1

最后通过在imageview上添加按钮并使其背景颜色清晰且标题为“”来解决：

这是代码片段：

 //print(mDict.objectForKey("ImageURL"))
    //var scrollWidth: Int = 120
    scrollview.contentSize = CGSizeMake(120.0, 80.0)
    var xOffset: CGFloat = 5
    //the loop go till all images will load
    for index in 0 ..< imagesName.count {

        let mImg: UIImageView = UIImageView()
        //set placeholder image
        mImg.image = UIImage(named: "lazyload_icon.png")
        let pDict = homePageProductArr[index] as NSDictionary

        //Create a UIVIEW 
        let containerView:UIView = UIView(frame: CGRect(x: 0, y: 0, width: 80, height: 120))
        let nameLabel:UILabel    = UILabel(frame:CGRect(x: xOffset+20, y: 95, width: 100, height: 20))
        nameLabel.text = (pDict.objectForKey("CategoryName") as! String)
        nameLabel.font = UIFont(name: "Helvetica Neue", size: Constant().HomeLabelFontSize)
        nameLabel.textColor = UIColor.colorWithHexString(Constant().HomeLabelHexColorCode)
        //set line and wrap text
        nameLabel.numberOfLines = 0
        nameLabel.sizeToFit()
        containerView.addSubview(nameLabel)
        containerView.userInteractionEnabled = false

        // make the imageview object because in scrollview we need image
        mImg.frame = CGRectMake(xOffset , 0, 90, 90)
        // the offset represent the values, used so that topleft for each image will
        // change with(5+xOffset, 0)and the bottomright(160, 110)
        //mImg.image = UIImage(named: imagesName[index])
        mImg.imageFromUrl(imagesName[index])
        //mImg.imageFromServerURL(imagesName[index])
        //Creating Circular Image
        mImg.layer.masksToBounds = true
        mImg.layer.borderColor = UIColor.whiteColor().CGColor
        mImg.layer.cornerRadius = mImg.frame.height/2
        mImg.clipsToBounds = false
        mImg.userInteractionEnabled = false


        // The image will put on the img object
        images.insert(mImg, atIndex: index)
        // Put the img object at the images array which is mutable array
        scrollview.contentSize = CGSizeMake(120 + xOffset, 110)
        //scroll view size show after 125 width the scroll view enabled
        containerView.addSubview(images[index] as! UIView)
        scrollview.addSubview(containerView)//images[index] as! UIView)
        // set images on scroll view
        xOffset += 100

        //Adding button to fire event
        let touchButton:UIButton = UIButton()
        touchButton.frame = mImg.frame
        touchButton.backgroundColor = UIColor.clearColor()
        touchButton.tag = index
        touchButton.addTarget(self, action: Selector("touchCategoryAction:"), forControlEvents: UIControlEvents.TouchUpInside)
        touchButton.setTitle("", forState: UIControlState.Normal)
        scrollview.addSubview(touchButton)
        scrollview.bringSubviewToFront(touchButton)

Answer 2

代替使用UIImageView，可以使用UIButton并将背景图像设置为按钮并设置标题“”。 然后，您无需同时添加UIImageView和UIButton。 UIButton可以通过UIScrollView轻松获取Tapped事件。

Answer 3

这不是UIScrollView的问题。 我们可以将手势用于单个视图。 下面是您问题的另一种解决方案-

1. 您必须全局声明轻击手势。

    var singleTap:UITapGestureRecognizer! 

2. 在此步骤中，我们创建一个函数，该函数采用UIimageView并将手势添加到其顶部。

     func setGesture(img_View:UIImageView) { singleTap = UITapGestureRecognizer.init(target: self, action: Selector("resignResponder")) singleTap.numberOfTapsRequired = 1 view.addGestureRecognizer(singleTap) 

   }

3. 现在创建手势动作。

    func resignResponder() { } 

这是解决问题的三个步骤。 为每个imageView调用“ setGesture”。 您可以成功识别每个imageView的拍子。