I added some constraints but it scrolls horizontally, Where is the problem how can I manage it to scroll vertically? I tried to add some extra points to the width and height of contentSize separately but no results it keeps scrolling horizontally.

2. And I just realized second problem my fav button inside UIView started not working after I added ScrollView, however, button added to the UIView that subview of ContentView which inside of ScrollView. Thanks in Advance!

private func setupScrollView() {
      self.view.addSubview(scrollView)
      scrollView.addSubview(contentView)
      scrollView.translatesAutoresizingMaskIntoConstraints = false
      contentView.translatesAutoresizingMaskIntoConstraints = false
      
      scrollView.contentSize = CGSize(width: self.view.frame.width, height: self.view.frame.height   1000)
      
      NSLayoutConstraint.activate([
          scrollView.topAnchor.constraint(equalTo: self.view.topAnchor),
          scrollView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
          scrollView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
          scrollView.leadingAnchor.constraint(equalTo:self.view.leadingAnchor)
      ])
          NSLayoutConstraint.activate([
              contentView.topAnchor.constraint(equalTo: scrollView.topAnchor),
              contentView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),
              contentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
              contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
      ])

CodePudding user response：

You need to set the height of the content for the UIScrollView in the viewWillLayoutSubviews:

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    self.scrollView.contentSize.height = self.view.frame.height   1000
}

And remove this line: scrollView.contentSize = CGSize(width: self.view.frame.width, height: self.view.frame.height 1000)

CodePudding user response：

You can try

Key of solving

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    scrollView.contentSize = CGSize(width: self.view.frame.width, height: self.view.frame.height   1000)
}

class ViewController: UIViewController {

    let scrollView = UIScrollView()
    let contentView = UIView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        setupScrollView()
    }

    private func setupScrollView() {
        scrollView.backgroundColor = .orange
        contentView.backgroundColor = .red
        self.view.addSubview(scrollView)
        scrollView.addSubview(contentView)
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        contentView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            scrollView.topAnchor.constraint(equalTo: self.view.topAnchor),
            scrollView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor),
            scrollView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
            scrollView.leadingAnchor.constraint(equalTo:self.view.leadingAnchor),
            
            contentView.widthAnchor.constraint(equalTo: view.widthAnchor),
            contentView.topAnchor.constraint(equalTo: scrollView.topAnchor),
            contentView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),
            contentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
            contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
            contentView.heightAnchor.constraint(equalToConstant: 300)
        ])
         
    }
   
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        scrollView.contentSize = CGSize(width: self.view.frame.width, height: self.view.frame.height   1000)
    }


}

CodePudding user response：

Not able to comment as i dont have enought points so i share link in answer

Create a vertical UIScrollView programmatically in Swift