+ (UIImage *)clearImageView {

    UIColor *color=[UIColor clearColor];

    CGRect rect =CGRectMake(,,,);

    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context =UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [color CGColor]);

    CGContextFillRect(context, rect);

    UIImage *image =UIGraphicsGetImageFromCurrentImageContext();

    return image;

}