ios开发之16进制颜色(html颜色值)字符串转为UIColor

+ (UIColor *) colorWithHexString: (NSString *)color

{

    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    

    // String should be 6 or 8 characters

    if ([cString length] < 6) {

        return [UIColor clearColor];

    }

    

    // 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 clearColor];

    

    // Separate into r, g, b substrings

    NSRange range;

    range.location = 0;

    range.length = 2;

    

    //r

    NSString *rString = [cString substringWithRange:range];

    

    //g

    range.location = 2;

    NSString *gString = [cString substringWithRange:range];

    

    //b

    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];

}