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September 29, 2020 07:30
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Autolayout UIKit
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| ///// Copyright (c) 2017 Razeware LLC | |
| /// | |
| /// Permission is hereby granted, free of charge, to any person obtaining a copy | |
| /// of this software and associated documentation files (the "Software"), to deal | |
| /// in the Software without restriction, including without limitation the rights | |
| /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| /// copies of the Software, and to permit persons to whom the Software is | |
| /// furnished to do so, subject to the following conditions: | |
| /// | |
| /// The above copyright notice and this permission notice shall be included in | |
| /// all copies or substantial portions of the Software. | |
| /// | |
| /// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish, | |
| /// distribute, sublicense, create a derivative work, and/or sell copies of the | |
| /// Software in any work that is designed, intended, or marketed for pedagogical or | |
| /// instructional purposes related to programming, coding, application development, | |
| /// or information technology. Permission for such use, copying, modification, | |
| /// merger, publication, distribution, sublicensing, creation of derivative works, | |
| /// or sale is expressly withheld. | |
| /// | |
| /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| /// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| /// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| /// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| /// THE SOFTWARE. | |
| import Foundation | |
| import UIKit | |
| // swiftlint:disable function_parameter_count | |
| // MARK: NSLayoutConstraint Convenience methods | |
| extension NSLayoutConstraint { | |
| // Pins an attribute of a view to an attribute of another view | |
| static func pinning(view: UIView, attribute: NSLayoutConstraint.Attribute, toView: UIView?, toAttribute: NSLayoutConstraint.Attribute, multiplier: CGFloat, constant: CGFloat) -> NSLayoutConstraint { | |
| return NSLayoutConstraint(item: view, attribute: attribute, relatedBy: .equal, toItem: toView, attribute: toAttribute, multiplier: multiplier, constant: constant) | |
| } | |
| // Pins an array of NSLayoutAttributes of a view to a specific view (has to respect view tree hierarchy) | |
| static func pinning(view: UIView, toView: UIView?, attributes: [NSLayoutConstraint.Attribute], multiplier: CGFloat, constant: CGFloat) -> [NSLayoutConstraint] { | |
| return attributes.compactMap({ (attribute) -> NSLayoutConstraint in | |
| return NSLayoutConstraint(item: view, attribute: attribute, relatedBy: .equal, toItem: toView, attribute: attribute, multiplier: multiplier, constant: constant) | |
| }) | |
| } | |
| // Pins bottom, top, leading and trailing of a view to a specific view (has to respect view tree hierarchy) | |
| static func pinningEdges(view: UIView, toView: UIView?) -> [NSLayoutConstraint] { | |
| let attributes: [NSLayoutConstraint.Attribute] = [.top, .bottom, .leading, .trailing] | |
| return NSLayoutConstraint.pinning(view: view, toView: toView, attributes: attributes, multiplier: 1.0, constant: 1.0) | |
| } | |
| // Pins bottom, top, leading and trailing of a view to its superview | |
| static func pinningEdgesToSuperview(view: UIView) -> [NSLayoutConstraint] { | |
| return NSLayoutConstraint.pinningEdges(view: view, toView: view.superview) | |
| } | |
| // Pins specified attribute to superview with specified or default multiplier and constant | |
| static func pinningToSuperview(view: UIView, attributes: [NSLayoutConstraint.Attribute], multiplier: CGFloat, constant: CGFloat) -> [NSLayoutConstraint] { | |
| return NSLayoutConstraint.pinning(view: view, toView: view.superview, attributes: attributes, multiplier: multiplier, constant: constant) | |
| } | |
| } | |
| // MARK: UIView Convenience methods | |
| extension UIView { | |
| /// Pin Edges of View to it's Superview | |
| func pinEdgesToSuperview() { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| guard let superview = self.superview else { return } | |
| let attributes: [NSLayoutConstraint.Attribute] = [.top, .bottom, .leading, .trailing] | |
| let constraints = NSLayoutConstraint.pinningToSuperview(view: self, attributes: attributes, multiplier: 1, constant: 0) | |
| superview.addConstraints(constraints) | |
| } | |
| /// Pin certain attributes to superView | |
| /// - Parameters: | |
| /// - attributes: Layout Attributes | |
| /// - multiplier: Multiplier | |
| /// - constant: Constant | |
| func pinToSuperview(forAtrributes attributes: [NSLayoutConstraint.Attribute], multiplier: CGFloat = 1.0, constant: CGFloat = 0.0) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| guard let superview = self.superview else { return } | |
| let constraints = NSLayoutConstraint.pinningToSuperview(view: self, attributes: attributes, multiplier: multiplier, constant: constant) | |
| superview.addConstraints(constraints) | |
| } | |
| /// Pin certain layout properties to particular view | |
| /// - Parameters: | |
| /// - toView: The View to pin to | |
| /// - attributes: Attributes | |
| /// - multiplier: Multiplier | |
| /// - constant: Constant | |
| func pin(toView: UIView, attributes: [NSLayoutConstraint.Attribute], multiplier: CGFloat = 1.0, constant: CGFloat = 0.0) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| guard let superview = self.superview else { return } | |
| let constraints = NSLayoutConstraint.pinning(view: self, toView: toView, attributes: attributes, multiplier: multiplier, constant: constant) | |
| superview.addConstraints(constraints) | |
| } | |
| /// Pin certain attributes to a View | |
| /// - Parameters: | |
| /// - attribute: Attributes | |
| /// - toView: View to pin to | |
| /// - toAttribute: that View's attribute | |
| /// - multiplier: Multiplier | |
| /// - constant: Constant | |
| func pin(attribute: NSLayoutConstraint.Attribute, toView: UIView?, toAttribute: NSLayoutConstraint.Attribute, multiplier: CGFloat = 1.0, constant: CGFloat = 0.0) { | |
| translatesAutoresizingMaskIntoConstraints = false | |
| guard let superview = self.superview else { return } | |
| let constraint = NSLayoutConstraint.pinning(view: self, attribute: attribute, toView: toView, toAttribute: toAttribute, multiplier: multiplier, constant: constant) | |
| superview.addConstraint(constraint) | |
| } | |
| } |
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