imageNamed是邪恶的-如何使用该功能 [英] imageNamed is evil - How to use the function

问题描述

- (UIImage*)thumbnailImage:(NSString*)fileName
{
   UIImage *thumbnail = [thumbnailCache objectForKey:fileName];

   if (nil == thumbnail)
   {
      NSString *thumbnailFile = [NSString stringWithFormat:@"%@/thumbnails/%@.jpg", [[NSBundle mainBundle] resourcePath], fileName];
      thumbnail = [UIImage imageWithContentsOfFile:thumbnailFile];
      [thumbnailCache setObject:thumbnail forKey:fileName];
   }
   return thumbnail;
}

我从 http://www获得了此代码.alexcurylo.com/blog/2009/01/13/imagenamed-is-evil/.有人可以告诉我如何使用此代码.我只需要一点帮助，即可代替imageNamed来使用它.

I got this code from http://www.alexcurylo.com/blog/2009/01/13/imagenamed-is-evil/ . Can someone tell me how to use this code. I need just a little help how to use this in place of imageNamed.

推荐答案

NSMutableDictionary *thumbnailCache=[[NSMutableDictionary alloc]init];

然后将"thumbnails"文件夹添加到您的资源文件夹中，然后将ur png放在此处

then add "thumbnails" folder to ur resource folder then put ur png there

- (UIImage*)thumbnailImage:(NSString*)fileName
{
   UIImage *thumbnail = [thumbnailCache objectForKey:fileName];

   if (nil == thumbnail)
   {
      NSString *thumbnailFile = [NSString stringWithFormat:@"%@/thumbnails/%@.jpg", [[NSBundle mainBundle] resourcePath], fileName];
      thumbnail = [UIImage imageWithContentsOfFile:thumbnailFile];
      [thumbnailCache setObject:thumbnail forKey:fileName];
   }
   return thumbnail;
}

示例

将foo.png添加到资源文件夹//然后在此处创建UIImageView对象

add foo.png to resource folder //here create UIImageView object then

UIImageviewObject.image=[self thumbnailImage:@"foo.png"];

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