How to change the layout margins programmatically

Question

I have very easy setup in viewDidLoad, just add a view and pin it to superview's margins by 'anchors' style:

let myView = UIView(frame: .zero)
myView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(myView)
myView.backgroundColor = UIColor.red
myView.leadingAnchor.constraint(equalTo: view.layoutMarginsGuide.leadingAnchor).isActive = true
myView.trailingAnchor.constraint(equalTo: view.layoutMarginsGuide.trailingAnchor).isActive = true
myView.bottomAnchor.constraint(equalTo: view.layoutMarginsGuide.bottomAnchor).isActive = true
myView.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor).isActive = true
view.layoutMargins = .zero

The problem is that there is still a margin when running this in simulator. Why layoutMargins zeroing is ignored?

if you want zero why don´t use `view.leadingAnchor`directly? — Reinier Melian, Aug 24 '17 at 13:01
I can't. This is very simplified case from some project. I am not building a red rectangle app :-) — Viktor Kucera, Aug 24 '17 at 13:12
OK, I was suspecting that, so there is my answer to your problem — Reinier Melian, Aug 24 '17 at 13:14
also I think the proper name for this answer is How change the margins size programatically since this is your main issue or I am wrong? — Reinier Melian, Aug 24 '17 at 13:18

Reinier Melian · Answer 1 · 2017-08-24T13:24:49.673

1

You need add this in your UIViewController viewWillLayoutSubviews() method

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    view.layoutMargins = .zero
    view.layoutMarginsDidChange()
}

but if you need .zero of margins you can as I said in my comments use view.leadingAnchor as well

edited Aug 24 '17 at 13:24

answered Aug 24 '17 at 13:12

Reinier Melian

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Hmmm, this will be called multiple times. It's working though. Isn't there any other place/way to do this just once? I don't want to change it dynamically during the view life cycle. – Viktor Kucera Aug 24 '17 at 13:23
@ViktorKucera check this question https://stackoverflow.com/questions/27421469/setting-layoutmargins-of-uiview-doesnt-work seems this is the best shot we have, but you can add an subview as alternative solution – Reinier Melian Aug 24 '17 at 13:46
yes, is ignored indeed for me is an Apple mistake but is what we have so... no much left to do about it @ViktorKucera – Reinier Melian Aug 24 '17 at 14:18
It's fixed in iOS11, I've just tried in Xcode beta. Thanks for help. – Viktor Kucera Aug 24 '17 at 14:37
I am glad to hear that seems Apple is fixing his bugs, @ViktorKucera – Reinier Melian Aug 24 '17 at 21:07

score 1 · Answer 2 · answered Sep 14 '17 at 07:22

1

Try this.

if #available(iOS 11, *) {
   viewRespectsSystemMinimumLayoutMargins = false
   view.layoutMargins = UIEdgeInsets(top: 0, left: 8, bottom: 0, right: 0)
}

Apple document for reference.

answered Sep 14 '17 at 07:22

Sunil Targe

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score 0 · Accepted Answer · answered Aug 24 '17 at 14:37

0

This seems to be fixed/changed for iOS 11. Lower versions are out of luck.

I've elaborated more in this question

answered Aug 24 '17 at 14:37

Viktor Kucera

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score 0 · Answer 4 · answered Feb 27 '19 at 16:29

0

Don't forget self.view.insetsLayoutMarginsFromSafeArea = false which will add on to whatever values you set to self.view.directionalLayoutMargins or self.view.layoutMargins

answered Feb 27 '19 at 16:29

Seivan

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How to change the layout margins programmatically

4 Answers4