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@BradB132

BradB132/AutoLayoutController.swift

Created May 28, 2015 22:20
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AutoLayoutRecipesPt1-1
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AutoLayoutController.swift
@IBOutlet weak var constraint1: NSLayoutConstraint!
@IBOutlet weak var constraint2: NSLayoutConstraint!
@IBAction func animateViews(sender: AnyObject) {
constraint1.constant = CGFloat(arc4random_uniform(200))
constraint2.constant = CGFloat(arc4random_uniform(200))
UIView.animateWithDuration(0.5, animations: {
self.view.setNeedsUpdateConstraints()
self.view.layoutIfNeeded()
})
}
@chrisortman
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@BradB132 I'm reading through your autolayout blog posts (they are extremely helpful, thank you!) and I don't understand why in some of your action outlets you are able to change the constraint.constant value and the UI will update accordingly but in this example you call setNeedsUpdateConstraints and layoutIfNeeded

Why doesn't the UI update immediately after executing line 5 and again after executing line 6 ?

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