ios - 捏和缩放 swift

我试图实现捏和放大传递到控制器的图片，该控制器还包含一个滚动视图，如此处的教程所示:

https://www.veasoftware.com/tutorials/2015/8/3/pinch-to-zoom-uiimageview-with-swift

我不确定自己在做什么错。我的代码:

import UIKit
import Haneke

class imageZoomedController : UIViewController, UIScrollViewDelegate {


    @IBOutlet weak var imageView: UIImageView!
    var imageViewUrl : String?

    @IBOutlet weak var scrollView: UIScrollView!
    override func viewDidLoad()
    {
        super.viewDidLoad()
        self.scrollView.minimumZoomScale = 1.0
        self.scrollView.maximumZoomScale = 6.0
        self.imageView.userInteractionEnabled = true
        if let url = NSURL(string: imageViewUrl!) {
            print("url is \(url)")
            self.imageView!.hnk_setImageFromURL(url)
        }
    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView?
    {
        return self.imageView!
    }


}

我可以在屏幕上看到图像，但是捏和缩放手势没有生效

更新

imageView的约束:

Align center X to superView = 0
Align center Y to superView = 0
Trailing to superView = 0
Leading to superView = 0
Bottom space to superView = 0
Top space to superView = 0

scrollView的约束:

Trailing space to superView = -20
Leading space to superView = -20
Top space to topLayoutGuide = 20
Bottom space to bottomLayoutGuide = 20
//also tried 0 for all these as per demo but same outcome

最佳答案

我使用了相同的视频。问题是您需要将scrollView设置为委托。转到IB并控制，将scrollView拖动到视图控制器，然后选择Delegate。这应该解决它。

关于ios - 捏和缩放 swift ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33649665/