swift—UIColor十六进制

最新推荐文章于 2025-03-10 17:13:42 发布

马小撂

最新推荐文章于 2025-03-10 17:13:42 发布

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分类专栏： Swift 文章标签： swift UIColor 十六进制 RGB

本文链接：https://blog.youkuaiyun.com/weixin_43864837/article/details/88619823

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1：新建一个文件
在这里插入图片描述
2.代码

import Foundation
import UIKit

extension UIColor{
    class func colorWithHex(hexStr:String) -> UIColor{
        return UIColor.colorWithHex(hexStr: hexStr, alpha: 1)
    }
}

extension UIColor{
    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: "#2D2D38")
UIColor.colorWithHex(hexStr: "#2D2D38", alpha: 1)

UIColor+hex.swift