@propertyWrapper public struct UnitInterval<Value: FloatingPoint> { // 沒有私密屬性 // 統一的對外通道(wrappedValue)直接使用另一個 property wrapper @Clamped(in: 0...1) public var wrappedValue: Value = .zero public init(wrappedValue: Value = .zero) { self.wrappedValue = wrappedValue } }

struct RGB { @UnitInterval var red: Double = 0 @UnitInterval var green: Double = 0 @UnitInterval var blue: Double = 0 } let cornflowerBlue = RGB(red: 0.392, green: 0.584, blue: 0.929) let white = RGB(red: 1, green: 2, blue: 3) let black = RGB() print(cornflowerBlue.red, white.green, black.blue) // 0.392 1.0 0.0

UnitInterval

將變數限制在 0 ... 1 之間。

@propertyWrapper
public struct UnitInterval<Value: FloatingPoint> {
    
    // 沒有私密屬性
    // 統一的對外通道(wrappedValue)直接使用另一個 property wrapper
    @Clamped(in: 0...1) 
    public var wrappedValue: Value = .zero
    
    public init(wrappedValue: Value = .zero) {
        self.wrappedValue = wrappedValue
    }
}

struct RGB {
    @UnitInterval var   red: Double = 0
    @UnitInterval var green: Double = 0
    @UnitInterval var  blue: Double = 0
}

let cornflowerBlue = RGB(red: 0.392, green: 0.584, blue: 0.929)
let white = RGB(red: 1, green: 2, blue: 3)
let black = RGB()

print(cornflowerBlue.red, white.green, black.blue)  // 0.392 1.0 0.0

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Last updated 3 years ago

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