Question

我正在以编程方式创建scrollView，但是由于某些原因，我可以看到scrollView的滚动条，但是subViews没有滚动。在下面添加了我的代码

//create a closure for scroll view
    let vcScrollView: UIScrollView = {
        let scrollView = UIScrollView()
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        scrollView.backgroundColor = UIColor.dark_background

        return scrollView
    }()

//create closure for dark view
    let darkView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor.black
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

//create a closure for offer label
    let offerLabel: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.textColor = UIColor.white
        return label
    }()

override func viewDidLoad() {
        super.viewDidLoad()
        modalPresentationCapturesStatusBarAppearance = true

        view.addSubview(vcScrollView)
        setUpViews()


    }

func setUpViews(){
        //scrollView
        vcScrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        vcScrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        vcScrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        vcScrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        vcScrollView.contentSize.height = 1500

        //Dark view
        vcScrollView.addSubview(darkView)
        darkView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        darkView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        darkView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        darkView.heightAnchor.constraint(equalToConstant: 130).isActive = true

        //Offer Label
        darkView.addSubview(offerLabel)
        offerLabel.text = selectedOffer
        offerLabel.font = UIFont(name: String.defaultFontR, size: 29)
        offerLabel.textAlignment = .center
        offerLabel.topAnchor.constraint(equalTo: darkView.topAnchor, constant: 95).isActive = true
        offerLabel.leadingAnchor.constraint(equalTo: darkView.leadingAnchor, constant: 20).isActive = true
        offerLabel.trailingAnchor.constraint(equalTo: darkView.trailingAnchor, constant: -20).isActive = true
    }

也已将滚动视图添加为该视图的子视图。预先感谢

Answer 1

我认为您应该使用scrollview提供暗视图的约束。当前，您正在从视图中提供约束。像这样-

darkView.leadingAnchor.constraint(equalTo: vcScrollView.leadingAnchor).isActive = true

darkView.topAnchor.constraint(equalTo: vcScollView.topAnchor).isActive = true
    darkView.trailingAnchor.constraint(equalTo: vcScollView.trailingAnchor).isActive = true
    darkView.heightAnchor.constraint(equalToConstant: 130).isActive = true

还提供了底部约束，以便scollview可以适当地调整内容大小。

Answer 2

问题是您的滚动视图的孩子正在使用int n1[]=new int[n];锚点。切换它们以使用for (i = 0; i < n; i++) { //create a NEW array int n1[]=new int[n]; //calculate n1, yada, yada, yada //create a new node with the new array nodes[i]=cluster1.new node(i+1,sum,n1); }锚点。另外，可以使用宽度约束代替尾随约束。这将允许它上下滚动。

ensureBufferingHasFinished(serviceProvider) {
 return new Promise(function (resolve, reject) {
  (function waitForBufferingComplete(){
       if (!serviceProvider.getBufferingStatus()) {
         alert("RESOLVED");
         return resolve();
       }
       setTimeout(waitForBufferingComplete, 250);
   })();
 });
}

如果要在darkView下包含视图，则需要提供子视图的底部锚点。

SubViews不滚动，但滚动条显示为快速滚动

2 个答案: