swift—UIColor十六进制

Posted 2022-03-16 st646889325

1. 新建一个文件UIColor+hex.swift

2.代码

import Foundation
import UIKit

extension UIColor
    
    class func colorWithHex(hexStr:String) -> UIColor
        return UIColor.colorWithHex(hexStr : hexStr, alpha:1)
    
    
    class func colorWithHex(hexStr:String, alpha:Float) -> UIColor
        
        var cStr = hexStr.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines).uppercased() as NSString;
        
        if(cStr.length < 6)
            return UIColor.clear;
        
        
        if(cStr.hasPrefix("0x"))
            cStr = cStr.substring(from: 2) as NSString
        
        
        if(cStr.hasPrefix("#"))
            cStr = cStr.substring(from: 1) as NSString
        
        
        if(cStr.length != 6)
            return UIColor.clear
        
        
        let rStr = (cStr as NSString).substring(to: 2)
        let gStr = ((cStr as NSString).substring(from: 2) as NSString).substring(to: 2)
        let bStr = ((cStr as NSString).substring(from: 4) as NSString).substring(to: 2)
        
        var r: UInt32 = 0x0
        var g: UInt32 = 0x0
        var b: UInt32 = 0x0
        
        Scanner.init(string: rStr).scanHexInt32(&r)
        Scanner.init(string: gStr).scanHexInt32(&g)
        Scanner.init(string: bStr).scanHexInt32(&b)
        
        return UIColor.init(red: CGFloat(r)/255.0, green: CGFloat(g)/255.0, blue: CGFloat(b)/255.0, alpha: CGFloat(alpha));
        
    

3. 调用

 UIColor.colorWithHex(hexStr: "#e36464")
  UIColor.colorWithHex(hexStr: "#e36464",alpha:1)