Created
September 9, 2020 06:36
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SwiftUI - Conditional view modifiers
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struct SwiftUIView: View { | |
var condition1: Bool = true | |
var condition2: Bool = false | |
var customColor: Color? | |
var body: some View { | |
Text("Hello, World!") | |
.ifLet(customColor) { $0.foregroundColor($1) } | |
.if(condition1) { $0.padding(16) } | |
.if(condition2) { $0.hidden() } | |
.if(condition1, if: { $0.padding(8) }, else: { $0.padding(16) }) | |
} | |
} | |
struct SwiftUIView_Previews: PreviewProvider { | |
static var previews: some View { | |
SwiftUIView() | |
} | |
} | |
extension View { | |
@ViewBuilder | |
func `if`<Transform: View>( | |
_ condition: Bool, | |
transform: (Self) -> Transform | |
) -> some View { | |
if condition { | |
transform(self) | |
} else { | |
self | |
} | |
} | |
@ViewBuilder | |
func `if`<TrueContent: View, FalseContent: View>( | |
_ condition: Bool, | |
if ifTransform: (Self) -> TrueContent, | |
else elseTransform: (Self) -> FalseContent | |
) -> some View { | |
if condition { | |
ifTransform(self) | |
} else { | |
elseTransform(self) | |
} | |
} | |
@ViewBuilder | |
func ifLet<V, Transform: View>( | |
_ value: V?, | |
transform: (Self, V) -> Transform | |
) -> some View { | |
if let value = value { | |
transform(self, value) | |
} else { | |
self | |
} | |
} | |
@ViewBuilder | |
func ignoreKeyboard() -> some View { | |
if #available(iOS 14.0, *) { | |
ignoresSafeArea(.keyboard) | |
} else { | |
self // iOS 13 always ignores the keyboard | |
} | |
} | |
@ViewBuilder | |
func insetGroupedListStyle() -> some View { | |
if #available(iOS 14.0, *) { | |
self.listStyle(InsetGroupedListStyle()) | |
} else { | |
self | |
.listStyle(GroupedListStyle()) | |
.environment(\.horizontalSizeClass, .regular) | |
} | |
} | |
} |
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