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// https://medium.com/halcyon-mobile/view-decoration-in-swift-4023a68be5d3 | |
import UIKit | |
import PlaygroundSupport | |
protocol ViewDecorator { | |
associatedtype View: UIView | |
func decorate(view: View) | |
} | |
struct AnyViewDecorator<V> { | |
let _decorate: (V) -> Void | |
init<D: ViewDecorator>(decorator: D) where D.View == V { | |
_decorate = decorator.decorate | |
} | |
func decorate(view: V) { | |
_decorate(view) | |
} | |
} | |
extension UIView { | |
func decorate(with decorator: AnyViewDecorator<UIView>) { | |
decorator.decorate(view: self) | |
} | |
func decorate(with decorators: [AnyViewDecorator<UIView>]) { | |
decorators.forEach { $0.decorate(view: self) } | |
} | |
} | |
struct CornerRadiusViewDecorator: ViewDecorator { | |
let cornerRadius: CGFloat | |
func decorate(view: UIView) { | |
view.clipsToBounds = true | |
view.layer.cornerRadius = cornerRadius | |
} | |
} | |
struct ShadowViewDecorator: ViewDecorator { | |
let radius: CGFloat | |
func decorate(view: UIView) { | |
view.layer.shadowRadius = radius | |
view.layer.shadowOpacity = 0.3 | |
view.layer.shadowColor = UIColor.black.cgColor | |
view.layer.shadowOffset = CGSize(width: 0, height: radius / 2) | |
view.layer.masksToBounds = false | |
} | |
} | |
struct CardViewDecorator: ViewDecorator { | |
private let decorators: [AnyViewDecorator<UIView>] = [ | |
AnyViewDecorator(decorator: CornerRadiusViewDecorator(cornerRadius: 4)), | |
AnyViewDecorator(decorator: ShadowViewDecorator(radius: 2)) | |
] | |
func decorate(view: UIView) { | |
view.decorate(with: decorators) | |
} | |
} | |
struct ButtonViewDecorator: ViewDecorator { | |
typealias View = UIButton | |
func decorate(view: UIButton) { | |
view.setTitleColor(.white, for: .normal) | |
view.setTitleShadowColor(.black, for: .normal) | |
view.titleEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 50) | |
} | |
} | |
struct LabelViewDecorator: ViewDecorator { | |
typealias View = UILabel | |
func decorate(view: UILabel) { | |
view.tintColor = .red | |
} | |
} | |
class ViewController: UIViewController { | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
self.view.frame = CGRect(x: 0, y: 0, width: 320, height: 480) | |
self.view.backgroundColor = .white | |
let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 100)) | |
button.setTitle("OK", for: .normal) | |
button.backgroundColor = .blue | |
let cardDecorator = CardViewDecorator() | |
cardDecorator.decorate(view: button) | |
self.view.addSubview(button) | |
let button2 = UIButton(frame: CGRect(x: 100, y: 300, width: 100, height: 100)) | |
button2.setTitle("NG", for: .normal) | |
button2.backgroundColor = .red | |
button2.decorate(with: [ | |
AnyViewDecorator(decorator: CornerRadiusViewDecorator(cornerRadius: 10)), | |
AnyViewDecorator(decorator: ShadowViewDecorator(radius: 4)) | |
]) | |
self.view.addSubview(button2) | |
let button3 = UIButton(frame: CGRect(x: 100, y: 500, width: 100, height: 100)) | |
button3.setTitle("Not", for: .normal) | |
button3.backgroundColor = .green | |
let buttonDecorator = ButtonViewDecorator() | |
buttonDecorator.decorate(view: button3) | |
self.view.addSubview(button3) | |
} | |
} | |
let viewController = ViewController() | |
PlaygroundPage.current.liveView = viewController |
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