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UIView Swift extension to add auto layout constraints to the view
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import UIKit | |
public extension UIView { | |
func addHeightConstraint(_ height: CGFloat) { | |
addConstraint(NSLayoutConstraint(item: self, | |
attribute: .height, | |
relatedBy: .equal, | |
toItem: nil, | |
attribute: .notAnAttribute, | |
multiplier: 1.0, | |
constant: height)) | |
} | |
func addHeightWidthRatio( _ ratio: CGFloat) { | |
addConstraint(NSLayoutConstraint(item: self, | |
attribute: .height, | |
relatedBy: .equal, | |
toItem: self, | |
attribute: .width, | |
multiplier: ratio, constant: 0)) | |
} | |
func addWidthConstraint(_ height: CGFloat) { | |
addConstraint(NSLayoutConstraint(item: self, | |
attribute: .width, | |
relatedBy: .equal, | |
toItem: nil, | |
attribute: .notAnAttribute, | |
multiplier: 1.0, | |
constant: height)) | |
} | |
func centerXAxisToSuperView() { | |
guard let superview = superview else { return } | |
superview.addConstraint(NSLayoutConstraint(item: self, | |
attribute: .centerX, | |
relatedBy: .equal, | |
toItem: superview, | |
attribute: .centerX, | |
multiplier: 1, | |
constant: 0)) | |
} | |
func centerYAxisToSuperView() { | |
guard let superview = superview else { return } | |
superview.addConstraint(NSLayoutConstraint(item: self, | |
attribute: .centerY, | |
relatedBy: .equal, | |
toItem: superview, | |
attribute: .centerY, | |
multiplier: 1, | |
constant: 0)) | |
} | |
func centerToSuperView() { | |
centerXAxisToSuperView() | |
centerYAxisToSuperView() | |
} | |
func stickEdgesToSuperView(edges: [NSLayoutAttribute] = [.leading, .trailing, .top, .bottom], spaces: [CGFloat] = [0.0, 0.0, 0.0, 0.0]) { | |
guard let superview = superview, edges.count == spaces.count else { return } | |
for (index, edge) in edges.enumerated() { | |
switch edge { | |
case .top, .leading: | |
superview.addConstraint(NSLayoutConstraint(item: self, | |
attribute: edge, | |
relatedBy: .equal, | |
toItem: superview, | |
attribute: edge, | |
multiplier: 1.0, | |
constant: spaces[index])) | |
case .bottom, .trailing: | |
superview.addConstraint(NSLayoutConstraint(item: superview, | |
attribute: edge, | |
relatedBy: .equal, | |
toItem: self, | |
attribute: edge, | |
multiplier: 1.0, | |
constant: spaces[index])) | |
default: | |
break | |
} | |
} | |
} | |
func stickToTopView(topView: UIView, _ space: CGFloat) { | |
guard let superview = superview else { return } | |
superview.addConstraint(NSLayoutConstraint( | |
item: self, | |
attribute: .top, | |
relatedBy: .equal, | |
toItem: topView, | |
attribute: topView == superview ? .top : .bottom, | |
multiplier: 1.0, | |
constant: space)) | |
} | |
func stickToBottomView(bottomView: UIView, _ space: CGFloat) { | |
guard let superview = superview else { return } | |
superview.addConstraint(NSLayoutConstraint( | |
item: bottomView, | |
attribute: bottomView == superview ? .bottom : .top, | |
relatedBy: .equal, | |
toItem: self, | |
attribute: .bottom, | |
multiplier: 1.0, | |
constant: space)) | |
} | |
func stickToLeftView(leftView: UIView, _ space: CGFloat) { | |
guard let superview = superview else { return } | |
superview.addConstraint(NSLayoutConstraint( | |
item: self, | |
attribute: .leading, | |
relatedBy: .equal, | |
toItem: leftView, | |
attribute: leftView == superview ? .leading : .trailing, | |
multiplier: 1.0, | |
constant: space)) | |
} | |
func stickToRightView(rightView: UIView, _ space: CGFloat) { | |
guard let superview = superview else { return } | |
superview.addConstraint(NSLayoutConstraint( | |
item: rightView, | |
attribute: rightView == superview ? .trailing : .leading, | |
relatedBy: .equal, | |
toItem: self, | |
attribute: .trailing, | |
multiplier: 1.0, | |
constant: space)) | |
} | |
} |
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