SwiftUI：如何通过颜色名称字符串设置背景颜色

Question

我有var color: String = "blue"。使用该变量，我想设置按钮的背景颜色。我试过.background(Color(color))，但这不起作用。 .background(Color.blue) 或 .background(Color(.blue)) 工作，但我想使用 String 变量。如何做到这一点？

Answer 1

您可以比较输入的字符串并从中获得正确的颜色。请参见以下示例：

struct ContentView: View {
    
    var body: some View {
        Color(wordName: "red")
    }
}


extension Color {
    
    init?(wordName: String) {
        switch wordName {
        case "clear":       self = .clear
        case "black":       self = .black
        case "white":       self = .white
        case "gray":        self = .gray
        case "red":         self = .red
        case "green":       self = .green
        case "blue":        self = .blue
        case "orange":      self = .orange
        case "yellow":      self = .yellow
        case "pink":        self = .pink
        case "purple":      self = .purple
        case "primary":     self = .primary
        case "secondary":   self = .secondary
        default:            return nil
        }
    }
}