在Swift中获取滚动视图中触摸位置（坐标）

Question

我正在处理UIScrollView中的UIImageView，通过UIScrollView使UIImageView可缩放，但我的目标是获取一个点的坐标，这样每当用户在缩放时触摸UIImageView时，该点就会“粘”到UIImageView上，然后在取消缩放（即缩放比例为1.0时），坐标将被保存。

我已经能够获取图片，将其放入ScrollView中的ImageView中，并使图片可缩放，但无论何时我触摸scrollView，都不会显示任何坐标。

以下是我的代码：

    override func viewDidLoad() {
    super.viewDidLoad()

    self.scrollview.minimumZoomScale = 0.5
    self.scrollview.maximumZoomScale = 6.0
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

@IBAction func ChooseExisting(sender: AnyObject) {

    let picker = UIImagePickerController()

    picker.delegate = self
    picker.sourceType = .PhotoLibrary

    presentViewController(picker, animated: true, completion: nil)


}

@IBAction func Camera(sender: AnyObject) {
    let picker = UIImagePickerController()

    picker.delegate = self
    picker.sourceType = .Camera

    presentViewController(picker, animated: true, completion: nil)



}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
    ChosenImage.image = info[UIImagePickerControllerOriginalImage] as? UIImage
    dismissViewControllerAnimated(true, completion: nil)
}
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
    return self.ChosenImage
}
override func touchesEnded(touches: Set<NSObject>, withEvent event: (UIEvent!)) {
    if let touch = touches.first as? UITouch {
        let location = touch.locationInView(self.ChosenImage)

        println("\(location)")
    }
}

println 只返回除了在 ScrollView 内触摸位置以外的值。

- Marc

---

请确保将UIImageview的userInteractionEnabled属性设置为true。 - user523234

你应该使用手势。为UIImageView添加手势。 - tuledev

Answer 1

给你的 UIImageView 添加一个 UIGestureRecognizer，并将 userInteractionEnabled 设置为 true。

let tapGestureRecognizer = UITapGestureRecognizer(target:self, action:Selector("imageTapped:"))
imgViewClickTest.addGestureRecognizer(tapGestureRecognizer)
imgViewClickTest.userInteractionEnabled = true

然后处理点击事件

func imageTapped(recognizer : UIGestureRecognizer) {
    let tappedPoint: CGPoint = recognizer.locationInView(self.view!)
    let x: CGFloat = tappedPoint.x
    let y: CGFloat = tappedPoint.y

    print(tappedPoint)
    print(x)
    print(y)
}

- Rashwan L

Answer 2

将 UIGestureRecognizer 添加到您的 UIImageView 应该可以解决您的问题。

- Sabrican Ozan