作为我学习 SwiftUI 项目的一部分，我做了一些形状旋转，下面有代码。我想知道如何避免每个形状使用相同的三行修饰符。
func getShape(shape: Int, i: Int) -> AnyView {
switch shape {
case 0:
return AnyView(Rectangle()
.stroke(colors[Int(shapeColor)])
.frame(width: CGFloat(shapeWidth), height: CGFloat(shapeHeight))
.rotationEffect(Angle(degrees: Double(i) * Double(angleStep))))
case 1:
return AnyView(Capsule()
.stroke(colors[Int(shapeColor)])
.frame(width: CGFloat(shapeWidth), height: CGFloat(shapeHeight))
.rotationEffect(Angle(degrees: Double(i) * Double(angleStep))))
case 2:
return AnyView(Ellipse()
.stroke(colors[Int(shapeColor)])
.frame(width: CGFloat(shapeWidth), height: CGFloat(shapeHeight))
.rotationEffect(Angle(degrees: Double(i) * Double(angleStep))))
default:
return AnyView(Rectangle()
.stroke(colors[Int(shapeColor)])
.frame(width: CGFloat(shapeWidth), height: CGFloat(shapeHeight))
.rotationEffect(Angle(degrees: Double(i) * Double(angleStep))))
}
}
使用助手AnyShape类型橡皮擦
struct AnyShape: Shape {
private let builder: (CGRect) -> Path
init<S: Shape>(_ shape: S) {
builder = { rect in
let path = shape.path(in: rect)
return path
}
}
func path(in rect: CGRect) -> Path {
return builder(rect)
}
}
你的函数可以写成
func getShape(shape: Int, i: Int) -> some View {
let selectedShape: AnyShape = {
switch shape {
case 0:
return AnyShape(Rectangle())
case 1:
return AnyShape(Capsule())
case 2:
return AnyShape(Ellipse())
default:
return AnyShape(Rectangle())
}
}()
return selectedShape
.stroke(colors[Int(shapeColor)])
.frame(width: CGFloat(shapeWidth), height: CGFloat(shapeHeight))
.rotationEffect(Angle(degrees: Double(i) * Double(angleStep))))
}
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