Swift String to UIColor (支持3,4,6,8长度的16进制颜色值)

概述import UIKit       extension UIColor {   public convenience init(rgba: String) {   var red: CGFloat = 0.0   var green: CGFloat = 0.0   var blue: CGFloat = 0.0   var alpha: CGFloat = 1.0       if rgba. @H_502_204@ blue = CGfloat(hexValue & 0x00F) 0

import UIKit
	extension UIcolor {
	public convenIEnce init(rgba: String) {
	var red: CGfloat = 0.0
	var green: CGfloat 0
	var blue: CGfloat 0
	var Alpha: CGfloat 10
	if rgba.hasPrefix("#") {
	let index = advance(rgba.startIndex,1)
	let hex = rgba.substringFromIndex(index)
	let scanner = NSScanner(string: hex)
	var hexValue: CUnsignedLongLong = 0
	if scanner.scanHexLongLong(&hexValue) {
	switch (count(hex)) {
	case 3:
	red = CGfloat((hexValue & 0xF00) >> 8) / 150
	green & 0x0F0) 4) 0
	4:
	& 0xF000) 12) 0
	& 0x0F00) 0
	& 0x00F0) 0
	Alpha & 0x000F) 0
	6:
	& 0xFF0000) 16) 2550
	& 0x00FF00) 0
	& 0x0000FF) 0
	8:
	& 0xFF000000) 24) 0
	& 0x00FF0000) 0
	& 0x0000FF00) 0
	& 0x000000FF) 0
	default:
	print("InvalID RGB string,number of characters after '#' should be either 3,4,6 or 8")
	}
	} else {
	println("Scan hex error")
	}
	else {
	")
	}
	self.init(red:red,green:green,blue:blue,Alpha:Alpha)
	}
	}

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