例子: 用这个16色的做的蒙版效果,附带透明度20%的需求
// mengbanView.backgroundColor = UIColor.ZNColor_16RGB_alpha(hex: "#000000", alpha: 0.2)
import UIKit
extension UIColor {
static func ZNColor_16RGB (hex:String) -> UIColor {
var cString:String = hex.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)
if (cString.hasPrefix("#")) {
cString = (cString as NSString).substring(from: 1)
}
let rString = (cString as NSString).substring(to: 2)
let gString = ((cString as NSString).substring(from: 2) as NSString).substring(to: 2)
let bString = ((cString as NSString).substring(from: 4) as NSString).substring(to: 2)
var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;
Scanner(string: rString).scanHexInt32(&r)
Scanner(string: gString).scanHexInt32(&g)
Scanner(string: bString).scanHexInt32(&b)
return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))
}
static func ZNColor_16RGB_alpha (hex:String, alpha:CGFloat) -> UIColor {
var cString:String = hex.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)
if (cString.hasPrefix("#")) {
cString = (cString as NSString).substring(from: 1)
}
let rString = (cString as NSString).substring(to: 2)
let gString = ((cString as NSString).substring(from: 2) as NSString).substring(to: 2)
let bString = ((cString as NSString).substring(from: 4) as NSString).substring(to: 2)
var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;
Scanner(string: rString).scanHexInt32(&r)
Scanner(string: gString).scanHexInt32(&g)
Scanner(string: bString).scanHexInt32(&b)
return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: alpha)
}
}
UIColor16进制颜色
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