[EDIT: Warning: The entire ensuing discussion will be possibly outmoded or at least heavily mitigated by iOS 8, which may no longer make the mistake of triggering layout at the time that a view transform is applied.] Autolayout vs. View Transforms Autolayout does not play at all well with view transforms. The reason, as far … Read more
LOOK, NO SPACERS! Based on suggestions in the comments section of my original answer, especially @Rivera’s helpful suggestions, I’ve simplified my original answer. I’m using gifs to illustrate just how simple this is. I hope you find the gifs helpful. Just in case you have a problem with gifs, I’ve included the old answer below … Read more
This answer is outdated from iOS 14 with the addition of compositional layouts. Please consider updating the new API Updated for Swift 5 preferredLayoutAttributesFittingAttributes renamed to preferredLayoutAttributesFitting and use auto sizing Updated for Swift 4 systemLayoutSizeFittingSize renamed to systemLayoutSizeFitting Updated for iOS 9 After seeing my GitHub solution break under iOS 9 I finally got … Read more
Two important notes: You need to call layoutIfNeeded within the animation block. Apple actually recommends you call it once before the animation block to ensure that all pending layout operations have been completed You need to call it specifically on the parent view (e.g. self.view), not the child view that has the constraints attached to … Read more
Do you plan to have a squared UIView of width: 100 and Height: 100 centered inside the UIView of an UIViewController? If so, you may try one of the 6 following Auto Layout styles (Swift 5 / iOS 12.2): 1. Using NSLayoutConstraint initializer override func viewDidLoad() { let newView = UIView() newView.backgroundColor = UIColor.red view.addSubview(newView) … Read more
How do I size a UITextView to its content?
TL;DR: Don’t like reading? Jump straight to the sample projects on GitHub: iOS 8 Sample Project – Requires iOS 8 iOS 7 Sample Project – Works on iOS 7+ Conceptual Description The first 2 steps below are applicable regardless of which iOS versions you are developing for. 1. Set Up & Add Constraints In your … Read more