nslayoutconstraint
Enable + Disable Auto-Layout Constraints
Aha! Constraints become nil (and thus can’t be reactivated), once their active property is set to false. Making them strong references (thanks, Caleb, for clearing up the nomenclature) preserves them so they can be activated and deactivated as desired.
UITextView inside UIScrollView with AutoLayout
After a few days of research and getting my hands dirty with UIScrollView + UITextView + Auto Layout, I successfully got a fully working UIScrollView. I want to share my solution just in case someone might stuck on the same situation. Add UIScrollView inside the main view in Storyboard Add UIView inside the UIScrollView Add … Read more
Update the constant property of a constraint programmatically in Swift?
In order to declare an animation, you cannot re-define the constraint and call updateConstraints. You are supposed to change the constant of your constraint and follow the format below: self.view.layoutIfNeeded() UIView.animate(withDuration: 1) { self.sampleConstraint.constant = 20 self.view.layoutIfNeeded() }
With Auto Layout, how do I make a UIImageView’s size dynamic depending on the image?
The image view’s intrinsic size is already dependent on the size of the image. Your assumptions (and constraints are correct). However, if you’ve set up your image view in interface builder and have not provided it with an image, then the layout system (interface builder) won’t know how big your image view is supposed to … Read more
iOS: How does one animate to new autolayout constraint (height)
After updating your constraint: [UIView animateWithDuration:0.5 animations:^{[self.view layoutIfNeeded];}]; Replace self.view with a reference to the containing view.