extension UIColor {
convenience init(_ color: Any) {
switch color {
case let hex as Int: //16进制整型
let intr = (hex >> 16) & 0xFF
let intg = (hex >> 8) & 0xFF
let intb = (hex) & 0xFF
self.init(red: CGFloat(intr)/255, green: CGFloat(intg)/255, blue: CGFloat(intb)/255, alpha: 1)
case let hex as String: //字符串
var cString = hex.trimmingCharacters(in:CharacterSet.whitespacesAndNewlines).uppercased()
if (cString.hasPrefix("#")) {
let index = cString.index(cString.startIndex, offsetBy:1)
cString = cString.substring(from: index)
}
if (cString.characters.count != 6) {
self.init(red: 1, green: 0, blue: 0, alpha: 1)
}
else {
let rIndex = cString.index(cString.startIndex, offsetBy: 2)
let rString = cString.substring(to: rIndex)
let otherString = cString.substring(from: rIndex)
let gIndex = otherString.index(otherString.startIndex, offsetBy: 2)
let gString = otherString.substring(to: gIndex)
let bIndex = cString.index(cString.endIndex, offsetBy: -2)
let bString = cString.substring(from: bIndex)
var intr:UInt32 = 0, intg:UInt32 = 0, intb:UInt32 = 0;
Scanner(string: rString).scanHexInt32(&intr)
Scanner(string: gString).scanHexInt32(&intg)
Scanner(string: bString).scanHexInt32(&intb)
self.init(red: CGFloat(intr)/255.0, green: CGFloat(intg)/255.0, blue: CGFloat(intb)/255.0, alpha: 1)
}
default:
self.init(red: 1, green: 0, blue: 0, alpha: 1)
break
}
}
}
swift3.1 UIColor扩展
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