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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| // | ||
| // UIView+Sweeter.swift | ||
| // | ||
| // Created by Yonat Sharon on 2019-02-08. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
||
| extension UIView { | ||
| /// Sweeter: Set constant attribute. Example: `constrain(.width, to: 17)` | ||
| @discardableResult func constrain( | ||
| _ at: NSLayoutConstraint.Attribute, | ||
| to: CGFloat = 0, | ||
| ratio: CGFloat = 1, | ||
| relation: NSLayoutConstraint.Relation = .equal, | ||
| priority: UILayoutPriority = .required, | ||
| identifier: String? = nil | ||
| ) -> NSLayoutConstraint { | ||
| let constraint = NSLayoutConstraint( | ||
| item: self, attribute: at, relatedBy: relation, | ||
| toItem: nil, attribute: .notAnAttribute, multiplier: ratio, constant: to | ||
| ) | ||
| constraint.priority = priority | ||
| constraint.identifier = identifier | ||
| addConstraintWithoutConflict(constraint) | ||
| return constraint | ||
| } | ||
|
|
||
| /// Sweeter: Pin subview at a specific place. Example: `constrain(label, at: .top)` | ||
| @discardableResult func constrain( | ||
| _ subview: UIView, | ||
| at: NSLayoutConstraint.Attribute, | ||
| diff: CGFloat = 0, | ||
| ratio: CGFloat = 1, | ||
| relation: NSLayoutConstraint.Relation = .equal, | ||
| priority: UILayoutPriority = .required, | ||
| identifier: String? = nil | ||
| ) -> NSLayoutConstraint { | ||
| let constraint = NSLayoutConstraint( | ||
| item: subview, attribute: at, relatedBy: relation, | ||
| toItem: self, attribute: at, multiplier: ratio, constant: diff | ||
| ) | ||
| constraint.priority = priority | ||
| constraint.identifier = identifier | ||
| addConstraintWithoutConflict(constraint) | ||
| return constraint | ||
| } | ||
|
|
||
| /// Sweeter: Pin two subviews to each other. Example: | ||
| /// | ||
| /// `constrain(label, at: .leading, to: textField)` | ||
| /// | ||
| /// `constrain(textField, at: .top, to: label, at: .bottom, diff: 8)` | ||
| @discardableResult func constrain( | ||
| _ subview: UIView, | ||
| at: NSLayoutConstraint.Attribute, | ||
| to subview2: UIView, | ||
| at at2: NSLayoutConstraint.Attribute = .notAnAttribute, | ||
| diff: CGFloat = 0, | ||
| ratio: CGFloat = 1, | ||
| relation: NSLayoutConstraint.Relation = .equal, | ||
| priority: UILayoutPriority = .required, | ||
| identifier: String? = nil | ||
| ) -> NSLayoutConstraint { | ||
| let at2real = at2 == .notAnAttribute ? at : at2 | ||
| let constraint = NSLayoutConstraint( | ||
| item: subview, attribute: at, relatedBy: relation, | ||
| toItem: subview2, attribute: at2real, multiplier: ratio, constant: diff | ||
| ) | ||
| constraint.priority = priority | ||
| constraint.identifier = identifier | ||
| addConstraintWithoutConflict(constraint) | ||
| return constraint | ||
| } | ||
|
|
||
| /// Sweeter: Add subview pinned to specific places. Example: `addConstrainedSubview(button, constrain: .centerX, .centerY)` | ||
| @discardableResult func addConstrainedSubview(_ subview: UIView, constrain: NSLayoutConstraint.Attribute...) -> [NSLayoutConstraint] { | ||
| return addConstrainedSubview(subview, constrainedAttributes: constrain) | ||
| } | ||
|
|
||
| @discardableResult internal func addConstrainedSubview(_ subview: UIView, constrainedAttributes: [NSLayoutConstraint.Attribute]) -> [NSLayoutConstraint] { | ||
| subview.translatesAutoresizingMaskIntoConstraints = false | ||
| addSubview(subview) | ||
| return constrainedAttributes.map { self.constrain(subview, at: $0) } | ||
| } | ||
|
|
||
| internal func addConstraintWithoutConflict(_ constraint: NSLayoutConstraint) { | ||
| removeConstraints(constraints.filter { | ||
| constraint.firstItem === $0.firstItem | ||
| && constraint.secondItem === $0.secondItem | ||
| && constraint.firstAttribute == $0.firstAttribute | ||
| && constraint.secondAttribute == $0.secondAttribute | ||
| }) | ||
| addConstraint(constraint) | ||
| } | ||
|
|
||
| /// Sweeter: The color used to tint the view, as inherited from its superviews. | ||
| var actualTintColor: UIColor { | ||
| var tintedView: UIView? = self | ||
| while let currentView = tintedView, nil == currentView.tintColor { | ||
| tintedView = currentView.superview | ||
| } | ||
| return tintedView?.tintColor ?? UIColor(red: 0, green: 0.5, blue: 1, alpha: 1) // swiftlint:disable:this no_magic_numbers | ||
| } | ||
| } |