Question

这让我疯了！

我将UIScrollView基于http://koreyhinton.com/blog/uiscrollview-crud.html以使其成为程序设计，因此在我的滚动视图中设置了容器视图。但它平移，但不会放大。

BinaryTreeViewController类：UIViewController，UIScrollViewDelegate {

var scrollView: UIScrollView!
var containerView : UIView!

override func viewDidLoad() {
    super.viewDidLoad()

    let width:CGFloat  = self.view.bounds.width
    let height:CGFloat = self.view.bounds.height

    scrollView = UIScrollView()
    scrollView.delegate = self
    scrollView.minimumZoomScale = 0.5
    scrollView.maximumZoomScale = 2.0
    scrollView.contentSize = CGSize(width: width*2, height: 2000)

    scrollView.backgroundColor = .red
    containerView = UIView()

    scrollView.addSubview(containerView)
    view.addSubview(scrollView)

    containerView.isUserInteractionEnabled = true
    scrollView.isUserInteractionEnabled = true
}

override func viewDidLayoutSubviews() {

    super.viewDidLayoutSubviews()

    scrollView.frame = view.bounds
    containerView.frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height)
}



override func viewWillLayoutSubviews() {
        //I create a view called "theView"
        containerView.addSubview(theView)
 }

以下功能不会在任何时候触发

func update(zoomScale: CGFloat, offSet: CGPoint) {
    scrollView.zoomScale = zoomScale
}

func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
    return containerView
}

func scrollViewDidZoom(_ scrollView: UIScrollView) {
    NSLog("scroll")
}

Answer 1

你真的不需要为此目的做那么多代码。您可以在故事板中设置scrollView所需的全部内容，并且只需要要放大的视图的插座。设置控制器，添加scrollview，将delegate属性连接到视图控制器，在IB中添加缩放视图作为子视图。

在类中，将控制器符合UIScrollViewDelegate，并使用viewForZooming，一种scrollView委托方法。

class ViewController: UIViewController, UIScrollViewDelegate {

@IBOutlet weak var zoomer: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a   nib.
    }

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

    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        return zoomer
    }
}

P.S。使用更新的学习资源，Ray Wenderlich，AppCoda等 - 这是一个充满良好资源的大型网站，Swift正在不断变化。

Swift 3 UIScrollview不要求缩放

1 个答案: