您快到了，您使用了错误的初始化参数：
extension Color {
init(hex: String) {
let scanner = Scanner(string: hex)
scanner.scanLocation = 0
var rgbValue: UInt64 = 0
scanner.scanHexInt64(&rgbValue)
let r = (rgbValue & 0xff0000) >> 16
let g = (rgbValue & 0xff00) >> 8
let b = rgbValue & 0xff
self.init(red: Double(r) / 0xff, green: Double(g) / 0xff, blue: Double(b) / 0xff)
}
}
Another alternative below that uses Int for hex but of course, it can be changed to String if you prefer that.
extension Color {
init(hex: Int, alpha: Double = 1) {
let compOnents= (
R: Double((hex >> 16) & 0xff) / 255,
G: Double((hex >> 08) & 0xff) / 255,
B: Double((hex >> 00) & 0xff) / 255
)
self.init(
.sRGB,
red: components.R,
green: components.G,
blue: components.B,
opacity: alpha
)
}
}
Usage examples:
Color(hex: 0x000000) Color(hex: 0x000000, alpha: 0.2)
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