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December 23, 2022 09:37
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Lightweight DSL for defining UIView hierarchy using Swift 5.1's function builders.
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protocol UIViewArrayConvertible { | |
func items() -> [UIView] | |
} | |
extension UIView: UIViewArrayConvertible { | |
func items() -> [UIView] { [self] } | |
} | |
extension Array: UIViewArrayConvertible where Element: UIView { | |
func items() -> [UIView] { self } | |
} | |
@_functionBuilder | |
struct UIViewBuilder { | |
static func buildBlock(_ components: UIViewArrayConvertible ...) -> UIViewArrayConvertible { components.flatMap { $0.items() } } | |
static func buildIf(_ component: UIViewArrayConvertible?) -> UIViewArrayConvertible { component ?? [UIView]() } | |
static func buildEither(first: UIViewArrayConvertible) -> UIViewArrayConvertible { first } | |
static func buildEither(second: UIViewArrayConvertible) -> UIViewArrayConvertible { second } | |
} | |
extension UIView { | |
@discardableResult | |
func addSubviews(@UIViewBuilder _ viewBuilder: () -> UIViewArrayConvertible) -> UIView { | |
for view in viewBuilder().items() { | |
self.addSubview(view) | |
} | |
return self | |
} | |
} | |
extension UIViewController { | |
@discardableResult | |
func addSubviews(@UIViewBuilder _ viewBuilder: () -> UIViewArrayConvertible) -> UIView { | |
for view in viewBuilder().items() { | |
self.view.addSubview(view) | |
} | |
return self.view | |
} | |
} |
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Usage example: