swift - UIImageView 捏缩放 swift

Question

我希望有人能帮助我。我试图让用户在 UIImageView 上捏缩放(允许最大和最小级别)。但由于某种原因，它不能正常工作。图像放大一点然后反弹回来。谢谢。

这是缩放功能

func zoom(sender:UIPinchGestureRecognizer) {


    if sender.state == .Ended || sender.state == .Changed {

        let currentScale = self.view.frame.size.width / self.view.bounds.size.width
        var newScale = currentScale*sender.scale

        if newScale < 1 {
            newScale = 1
        }
        if newScale > 9 {
            newScale = 9
        }

        let transform = CGAffineTransformMakeScale(newScale, newScale)

        self.imageView?.transform = transform
        sender.scale = 1

    }

}

Answer 1

用 UIScrollView 缩放 UIImageView || swift 3 和 Xcode 8 字母中的图像缩放 ios Youtube video URL

在 storyboard 中设置 uiscrollview Delegate

 class PhotoDetailViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var imgPhoto: UIImageView!
      
    override func viewDidLoad() {
        
        super.viewDidLoad()
    
        scrollView.minimumZoomScale = 1.0
        scrollView.maximumZoomScale = 6.0        
        // scrollView.delegate = self - it is set on the storyboard.
    }  
        
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
       
        return imgPhoto
    }