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May 8, 2020 20:20
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Making Programmatic Auto Layout Easy through Extensions
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| // | |
| // UIView+Layout.swift | |
| // Project X | |
| // | |
| // Created by Brian Voong on 2/10/19. | |
| // Copyright © 2019 Brian Voong. All rights reserved. | |
| // | |
| import UIKit | |
| // Reference Video: https://youtu.be/iqpAP7s3b-8 | |
| extension UIView { | |
| @discardableResult | |
| func anchor(top: NSLayoutYAxisAnchor?, leading: NSLayoutXAxisAnchor?, bottom: NSLayoutYAxisAnchor?, trailing: NSLayoutXAxisAnchor?, padding: UIEdgeInsets = .zero, size: CGSize = .zero) -> AnchoredConstraints { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| var anchoredConstraints = AnchoredConstraints() | |
| if let top = top { | |
| anchoredConstraints.top = topAnchor.constraint(equalTo: top, constant: padding.top) | |
| } | |
| if let leading = leading { | |
| anchoredConstraints.leading = leadingAnchor.constraint(equalTo: leading, constant: padding.left) | |
| } | |
| if let bottom = bottom { | |
| anchoredConstraints.bottom = bottomAnchor.constraint(equalTo: bottom, constant: -padding.bottom) | |
| } | |
| if let trailing = trailing { | |
| anchoredConstraints.trailing = trailingAnchor.constraint(equalTo: trailing, constant: -padding.right) | |
| } | |
| if size.width != 0 { | |
| anchoredConstraints.width = widthAnchor.constraint(equalToConstant: size.width) | |
| } | |
| if size.height != 0 { | |
| anchoredConstraints.height = heightAnchor.constraint(equalToConstant: size.height) | |
| } | |
| [anchoredConstraints.top, anchoredConstraints.leading, anchoredConstraints.bottom, anchoredConstraints.trailing, anchoredConstraints.width, anchoredConstraints.height].forEach{ $0?.isActive = true } | |
| return anchoredConstraints | |
| } | |
| func fillSuperview(padding: UIEdgeInsets = .zero) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| if let superviewTopAnchor = superview?.topAnchor { | |
| topAnchor.constraint(equalTo: superviewTopAnchor, constant: padding.top).isActive = true | |
| } | |
| if let superviewBottomAnchor = superview?.bottomAnchor { | |
| bottomAnchor.constraint(equalTo: superviewBottomAnchor, constant: -padding.bottom).isActive = true | |
| } | |
| if let superviewLeadingAnchor = superview?.leadingAnchor { | |
| leadingAnchor.constraint(equalTo: superviewLeadingAnchor, constant: padding.left).isActive = true | |
| } | |
| if let superviewTrailingAnchor = superview?.trailingAnchor { | |
| trailingAnchor.constraint(equalTo: superviewTrailingAnchor, constant: -padding.right).isActive = true | |
| } | |
| } | |
| func centerInSuperview(size: CGSize = .zero) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| if let superviewCenterXAnchor = superview?.centerXAnchor { | |
| centerXAnchor.constraint(equalTo: superviewCenterXAnchor).isActive = true | |
| } | |
| if let superviewCenterYAnchor = superview?.centerYAnchor { | |
| centerYAnchor.constraint(equalTo: superviewCenterYAnchor).isActive = true | |
| } | |
| if size.width != 0 { | |
| widthAnchor.constraint(equalToConstant: size.width).isActive = true | |
| } | |
| if size.height != 0 { | |
| heightAnchor.constraint(equalToConstant: size.height).isActive = true | |
| } | |
| } | |
| func centerXInSuperview() { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| if let superViewCenterXAnchor = superview?.centerXAnchor { | |
| centerXAnchor.constraint(equalTo: superViewCenterXAnchor).isActive = true | |
| } | |
| } | |
| func centerYInSuperview() { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| if let centerY = superview?.centerYAnchor { | |
| centerYAnchor.constraint(equalTo: centerY).isActive = true | |
| } | |
| } | |
| func constrainWidth(constant: CGFloat) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| widthAnchor.constraint(equalToConstant: constant).isActive = true | |
| } | |
| func constrainHeight(constant: CGFloat) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| heightAnchor.constraint(equalToConstant: constant).isActive = true | |
| } | |
| } | |
| struct AnchoredConstraints { | |
| var top, leading, bottom, trailing, width, height: NSLayoutConstraint? | |
| } |
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