Forked from bizz84/UIViewAutoLayoutAnchors.swift
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September 26, 2018 22:58
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UIView extension for programmatic Auto Layout
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| import UIKit | |
| extension UIView { | |
| enum SALViewError : Error { | |
| case noSuperview | |
| } | |
| func anchorAllEdgesToSuperview() throws { | |
| guard let superview = superview else { throw SALViewError.noSuperview } | |
| self.translatesAutoresizingMaskIntoConstraints = false | |
| if #available(iOS 9.0, *) { | |
| addSuperviewConstraint(constraint: topAnchor.constraint(equalTo: superview.topAnchor)) | |
| addSuperviewConstraint(constraint: leftAnchor.constraint(equalTo: superview.leftAnchor)) | |
| addSuperviewConstraint(constraint: bottomAnchor.constraint(equalTo: superview.bottomAnchor)) | |
| addSuperviewConstraint(constraint: rightAnchor.constraint(equalTo: superview.rightAnchor)) | |
| } | |
| else { | |
| for attribute : NSLayoutConstraint.Attribute in [.left, .top, .right, .bottom] { | |
| anchorToSuperview(attribute: attribute) | |
| } | |
| } | |
| } | |
| func anchorToSuperview(attribute: NSLayoutConstraint.Attribute) { | |
| addSuperviewConstraint(constraint: NSLayoutConstraint(item: self, attribute: attribute, relatedBy: .equal, toItem: superview, attribute: attribute, multiplier: 1.0, constant: 0.0)) | |
| } | |
| func addSuperviewConstraint(constraint: NSLayoutConstraint) { | |
| superview?.addConstraint(constraint) | |
| } | |
| } |
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| class ViewController { | |
| @IBOutlet var offlineView: UIView! | |
| @IBAction func showView(sender: UIButton) { | |
| self.view.addSubview(offlineView) | |
| offlineView.anchorAllEdgesToSuperview() | |
| } | |
| } |
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Updated for XCode 10 Swift 4.2