iphone - imageNamed是邪恶的-如何使用该功能

Question

- (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.alexcurylo.com/blog/2009/01/13/imagenamed-is-evil/获得了这段代码。有人可以告诉我如何使用此代码。我只需要一点帮助，如何使用它代替imageNamed。

Answer 1

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放在那里

- (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;
}

例

将foo.png添加到资源文件夹
//在这里创建UIImageView对象

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