将16进制颜色转换成UIColor-ios

-(UIColor *) hexStringToColor: (NSString *) stringToConvert
{
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    // String should be 6 or 8 characters

    if ([cString length] < ) return [UIColor blackColor];
    // strip 0X if it appears
    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:];
    if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:];
    if ([cString length] != ) return [UIColor blackColor];

    // Separate into r, g, b substrings

    NSRange range;
    range.location = ;
    range.length = ;
    NSString *rString = [cString substringWithRange:range];
    range.location = ;
    NSString *gString = [cString substringWithRange:range];
    range.location = ;
    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];
}