`Color.init(hue:saturation:brightness:opacity:)`？中的色调值范围是多少

Question

The Color initializer init(hue:saturation:brightness:opacity:) is undocumented。

我想我可以放心地假设saturation、brightness和opacity归一化为0...1的范围，该范围之外的值仅对宽域显示有效。

但我不能对hue做出这样的猜测。Is是0...1、0...τ还是0...360

Answer 1

令人高兴的是，这很容易快速测试。

我把这段代码放到了一个新的SwiftUI应用程序中，只看了一下预览就能看到结果。原来，it's 0...1**!**

import SwiftUI

struct ContentView: View {
    var body: some View {
        VStack(spacing: 0) {
            Color(hue: 0/6, saturation: 1, brightness: 1)
            Color(hue: 1/6, saturation: 1, brightness: 1)
            Color(hue: 2/6, saturation: 1, brightness: 1)
            Color(hue: 3/6, saturation: 1, brightness: 1)
            Color(hue: 4/6, saturation: 1, brightness: 1)
            Color(hue: 5/6, saturation: 1, brightness: 1)
            Color(hue: 6/6, saturation: 1, brightness: 1)
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

​

​