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DSL for building UIView hierarchies
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| precedencegroup HierarchyPrecedence { | |
| lowerThan: AssignmentPrecedence | |
| associativity: left | |
| } | |
| infix operator |--: HierarchyPrecedence | |
| public protocol UIViewHierarchyProvider { | |
| associatedtype View: UIView | |
| var view: View { get } | |
| var viewController: UIViewController? { get } | |
| func append(_ view: UIView) | |
| } | |
| extension UIViewHierarchyProvider { | |
| @discardableResult | |
| public static func |-- <V:UIView> (lpred: Self, rpred: V) -> Self { | |
| lpred.append(rpred) | |
| return lpred | |
| } | |
| @discardableResult | |
| public static func |-- <V:UIView> (lpred: Self, rpred: V?) -> Self { | |
| guard let view = rpred else { return lpred } | |
| lpred.append(view) | |
| return lpred | |
| } | |
| @discardableResult | |
| public static func |-- <V:UIView> (lpred: Self, rpred: [V]) -> Self { | |
| for view in rpred { lpred.append(view) } | |
| return lpred | |
| } | |
| @discardableResult | |
| public static func |-- (lpred: Self, rpred: UIViewController) -> Self { | |
| guard let parent = lpred.viewController else { return lpred } | |
| parent.addChild(rpred) | |
| lpred.append(rpred.view) | |
| rpred.didMove(toParent: parent) | |
| return lpred | |
| } | |
| } | |
| public class UIViewHierarchy: UIViewHierarchyProvider { | |
| public let view:UIView | |
| public let viewController: UIViewController? | |
| init(_ view:UIView, viewController: UIViewController?) { | |
| self.view = view | |
| self.viewController = viewController | |
| } | |
| public func append(_ view: UIView) { | |
| self.view.addSubview(view) | |
| } | |
| } | |
| public class UIStackViewHierarchy: UIViewHierarchyProvider { | |
| public let view:UIStackView | |
| public let viewController: UIViewController? | |
| init(_ view:UIStackView, viewController: UIViewController?) { | |
| self.view = view | |
| self.viewController = viewController | |
| } | |
| public func append(_ view: UIView) { | |
| self.view.addArrangedSubview(view) | |
| } | |
| } | |
| extension UIView { | |
| @discardableResult | |
| public func hierarchy(in viewController: UIViewController? = nil, _ processer:(UIViewHierarchy)->Void) -> Self { | |
| let h = UIViewHierarchy(self, viewController: viewController) | |
| processer(h) | |
| return self | |
| } | |
| } | |
| extension UIStackView { | |
| @discardableResult | |
| public func arrangedHierarchy(in viewController: UIViewController? = nil, skipCleaning: Bool = false, _ processer:(UIStackViewHierarchy)->Void) -> Self { | |
| if !skipCleaning { | |
| while let view = self.subviews.first { | |
| view.removeFromSuperview() | |
| } | |
| } | |
| let h = UIStackViewHierarchy(self, viewController: viewController) | |
| processer(h) | |
| return self | |
| } | |
| } | |
| extension UIViewController { | |
| @discardableResult | |
| public func hierarchy(_ processer:(UIViewHierarchy)->Void) -> Self { | |
| let h = UIViewHierarchy(self.view, viewController: self) | |
| processer(h) | |
| return self | |
| } | |
| } |
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