Hex转为UIColor

// 如hex为0xEEEEEE
+ (UIColor *) colorWithHex:(int)hex {
  return [UIColor colorWithRed:((float)((hex & 0xFF0000) >> 16))/255.0
                            green:((float)((hex & 0xFF00) >> 8))/255.0
                              blue:((float)(hex & 0xFF))/255.0 alpha:1.0];
}

// hex为#EEEEEE
+ (UIColor *)colorWithHexString:(NSString *)stringToConvert {
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return [UIColor whiteColor];
    
    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];
    
    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];
}