IOS根据十六进制字符串获得颜色带透明度

+ (UIColor *)GetColor:(NSString *)pColor alpha:(CGFloat) dAlpha
{
    NSString* pStr = [[pColor stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    // String should be 6 or 8 characters
    if ([pStr length] < 6) {
        return [UIColor clearColor];
    }
    
    // strip 0X if it appears
    if ([pStr hasPrefix:@"0X"])
        pStr = [pStr substringFromIndex:2];
    if ([pStr hasPrefix:@"#"])
        pStr = [pStr substringFromIndex:1];
    if ([pStr length] != 6)
        return [UIColor clearColor];
    
    // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
    
    //r
    NSString *rString = [pStr substringWithRange:range];
    
    //g
    range.location = 2;
    NSString *gString = [pStr substringWithRange:range];
    
    //b
    range.location = 4;
    NSString *bString = [pStr 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:dAlpha];
}