#OnlineImageView ######A category for UIImageView to show images from URLs and make cache.

• Usage
  

#import "UIImageView+OnlineImage.h"

/* code omiited */
[self.imageView setOnlineImage:IMAGE_URL];
[self.imageView1 setOnlineImage:IMAGE_URL1 placeholderImage:[UIImage imageNamed:@"question_mark"]];