将16进制转为 UIColor

+ (UIColor *) colorFromHexCode:(NSString *)hexString {

    NSString *cleanString = [hexString
stringByReplacingOccurrencesOfString:@"#"
withString:@""];

    if([cleanString
length] == 3) {

        cleanString = [NSString
stringWithFormat:@"%@%@%@%@%@%@",

                       [cleanString substringWithRange:NSMakeRange(0,
1)],[cleanString substringWithRange:NSMakeRange(0,
1)],

                       [cleanString substringWithRange:NSMakeRange(1,
1)],[cleanString substringWithRange:NSMakeRange(1,
1)],

                       [cleanString substringWithRange:NSMakeRange(2,
1)],[cleanString substringWithRange:NSMakeRange(2,
1)]];

    }

    if([cleanString
length] == 6) {

        cleanString = [cleanString stringByAppendingString:@"ff"];

    }

    

    unsigned int baseValue;

    [[NSScanner scannerWithString:cleanString]
scanHexInt:&baseValue];

    

    float red = ((baseValue >>
24) & 0xFF)/255.0f;

    float green = ((baseValue >>
16) & 0xFF)/255.0f;

    float blue = ((baseValue >>
8) & 0xFF)/255.0f;

    float alpha = ((baseValue >>
0) & 0xFF)/255.0f;

    

    return [UIColor
colorWithRed:red green:green
blue:blue alpha:alpha];

}