快速捏缩放

Question

我正在尝试以编程方式将图像和 ScrollView 添加到 swift，然后将它们捏合以进行缩放。

我已按照 UIImageView pinch zoom swift 中的说明进行操作但我仍然无法缩放，我不确定我错过了什么

class mapViewController: UIViewController, UIScrollViewDelegate, IALocationManagerDelegate {

    var imageViewBackground: UIImageView!

    override func viewDidLoad() {


        super.viewDidLoad()

        let width = UIScreen.main.bounds.size.width
        let height = UIScreen.main.bounds.size.height

        let imageViewBackground = UIImageView(frame: CGRect(x:0, y:0, width:width-70, height:height-60))
        var image: UIImage?
        let urlString = "https://firebasestorage.googleapis.com/v0/b/coxur-59760.appspot.com/o/Maps%2FCapture.png?alt=media&token=741b1425-cb01-453b-8c40-47f6e5fd528d"

        let url = NSURL(string: urlString)! as URL
        if let imageData: NSData = NSData(contentsOf: url) {
            image = UIImage(data: imageData as Data)
        }
        imageViewBackground.image = image

        // you can change the content mode:
        imageViewBackground.contentMode = UIView.ContentMode.scaleAspectFill

        var scrollView: UIScrollView!
        scrollView = UIScrollView(frame: CGRect(x: 0, y: 120, width: width, height: height))
        scrollView.contentSize = CGSize(width: width, height: 2000)
        scrollView.delegate = self
        scrollView.minimumZoomScale = 1.0
        scrollView.maximumZoomScale = 6.0

        scrollView.addSubview(imageViewBackground)
        self.view.addSubview(scrollView)
        //self.view.sendSubviewToBack(imageViewBackground)
    }
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {

        return imageViewBackground
    }


}

我在这里做错了什么？

Answer 1

问题是这一行:

let imageViewBackground = UIImageView(frame: CGRect(x:0, y:0, width:width-70, height:height-60))

删除让。问题解决了。