Change UIScrollView Content size

Question

I have ViewController with UIScrollView, some UIImages and UIButtons. In the Storyboard I set the size of UIScrollView to: width: 320, height: 570

I want to change Contentsize of my UIScrollView when the ViewController was loaded.

I added side in the viewDidLoad:

        scrlMain.contentSize = CGSize(width: 320,height: 790)

And also I added code in the viewDidLayoutSubviews:

        self.scrlMain.translatesAutoresizingMaskIntoConstraints = true

But my UIScrollView is still the last size = 570. I can't use viewDidAppear because, when I press the button, it need it to change color. When it has changed color, my UIScrollView moves to up.

What did I do wrong?

All code:

    override func viewDidLoad() {
    super.viewDidLoad()
    scrlMain.delegate = self
    scrlMain.contentSize = CGSizeMake(320, 790)
    }
override func viewDidLayoutSubviews() {
    self.scrlMain.translatesAutoresizingMaskIntoConstraints = true
    self.scrlMain.contentSize = CGSize(width: self.scrlMain.frame.width, height: 60.0 + 5 * (self.scrlMain.frame.width / 16.0 * 5.0));
}

Photoplay

Answer 1

there was an error in the this function:

override func viewDidLayoutSubviews() {
self.scrlMain.translatesAutoresizingMaskIntoConstraints = true
self.scrlMain.contentSize = CGSize(width: self.scrlMain.frame.width, height: 60.0 + 5 * (self.scrlMain.frame.width / 16.0 * 5.0));
}

I delete this code:

self.scrlMain.contentSize = CGSize(width: self.scrlMain.frame.width, height: 60.0 + 5 * (self.scrlMain.frame.width / 16.0 * 5.0));

And all was right

Photoplay

Answer 2

Hey @Dim you can try this-

yourScrollView.contentSize = CGSizeMake(320, 568)

And you can change size 568 to whatever you want.

Aubree

Hey @Mohd, I tried added scrlMain.contentSize = CGSizeMake(320, 790) and in the viewDidLoad. But I have the same problem. – Photoplay

For me not. I move UIScrollView to down, but it does not fix. It moves back. If add this code in viewDidAppear, UIScrollView can fix. But I can't use viewDidAppear. – Photoplay

Can you share your screen using <Skype or TeamViewer> – Aubree

Yes, I can. How I can do it? – Photoplay

I wrote you in the Skype. If you didn't get my request, write me your login please. – Photoplay

Answer 3

Try this:

yourScrollView.userInteractionEnabled = YES

and you please maintain the difference between your screen size and your scrollview content size... so that it can be visible properly

suppose yourScrollViewSize greatertThan yourScreenSize

Skite

I added code: scrlMain.userInteractionEnabled = true; in the viewDidLoad. But I have the same problem. In the Storyboard ViewController has 570, UIScrollController has 570. – Photoplay

Answer 4

override func viewDidLayoutSubviews() {

    DispatchQueue.main.async {
    self.scrollview.translatesAutoresizingMaskIntoConstraints = true
    self.scrollview.contentSize = CGSize(width:0, height:self.scrollview.frame.height*2) // whatever hight you want
    }
}

Bazemore

viewDidLayoutSubviews is always called on the main thread - passing this work to the main thread from the main thread is redundant. – Accouter

Answer 5

It is also possible to change the content size from within the page without running ViewDidLoad again.

Just add

scrollView.layoutIfNeeded()

after you set the new contentSize

Example when you change the content size (viewImages) within the UIscrollView (scrollViewImages)

viewImages.frame.size = CGSize(width: width, height: 128)
viewImages.translatesAutoresizingMaskIntoConstraints = true
viewImages.setNeedsLayout()
scrollViewImages.setNeedsLayout()
scrollViewImages.layoutIfNeeded()

Rein