ios 十六进制转换为十进制的

最新推荐文章于 2021-05-28 11:45:36 发布

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本文介绍了一个将十六进制颜色字符串转换为UIColor对象的方法。该方法首先清理输入字符串中的空白和特殊字符，然后检查其长度并按红绿蓝三部分进行拆分，最后通过扫描这些子串得到对应的整数值，并转换为UIColor。

-(UIColor *)intStringToColor:(NSString *)colorStrig
{
    
    NSString *cString = [[colorStrig stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    // String should be 6 or 8 characters
    
    if ([cString length] < 6) return [UIColor blackColor];
    // strip 0X if it appears
    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];
    if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];
    if ([cString length] != 6) return [UIColor blackColor];
    
    // Separate into r, g, b substrings
    
    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    // Scan values
    unsigned int r, g, b;
    
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    return [UIColor colorWithRed:((float) r / 255.0f)
                           green:((float) g / 255.0f)
                            blue:((float) b / 255.0f)
                           alpha:1.0f];
    
}

传过来你的十六进制数。返回给你一个UIColor