UI刷新、NSOutlineView reloadData和递归方法

发布于 2024-12-07 04:20:31 字数 878 浏览 3 评论 0原文

我填充 NSOutlineView 递归读取目录。读取目录及其子目录后，我刷新大纲，在调度内调用 reloadData ，如下所示

-(void)readDir:(NSString*)path {
   dispatch_async(dispatch_get_main_queue(), ^{ \
      [outlineView reloadData];
   });

 //////////
 //// some internal stuff
 //////////

  NSArray* subs = [self getSubDirs:path];
  for (NSString* p in subs) {
      [self readDir:p];
  }
}

从调度内部调用上面的方法以使 UI 响应

   - (void)startAll {
        dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
        dispatch_async(queue, ^{
           [self readDir:@"/"];
        });
   }

问题是有时 dispatch_async(dispatch_get_main_queue(), ...) 是在子目录正在读取时调用（它根本是异步的！）并且应用程序崩溃

如果我使用dispatch_sync（dispatch_get_main_queue（），...）（注意同步版本）轮廓绘制总是正确的，但它非常非常慢，所以问题是：

我如何才能尽可能快地重新排列代码并等待dispatch_[a]sync(dispatch_get_main_queue(), ...)完成？

原文

I populate a NSOutlineView reading a directory recursively.
After a directory and its subdirectories are read I refresh the outline calling reloadData inside a dispatch like shown below

-(void)readDir:(NSString*)path {
   dispatch_async(dispatch_get_main_queue(), ^{ \
      [outlineView reloadData];
   });

 //////////
 //// some internal stuff
 //////////

  NSArray* subs = [self getSubDirs:path];
  for (NSString* p in subs) {
      [self readDir:p];
  }
}

The method above is called from inside a dispatch to have the UI reactive

   - (void)startAll {
        dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
        dispatch_async(queue, ^{
           [self readDir:@"/"];
        });
   }

The problem is that sometimes dispatch_async(dispatch_get_main_queue(), ...) is called while subdirectories is reading (it's async at all!) and app crashes

If I use dispatch_sync(dispatch_get_main_queue(), ...) (note the sync version) the outline is drawn always correctly but it is very very slooooow so the question is:

how can I rearrange the code to be as fast as possible and wait that dispatch_[a]sync(dispatch_get_main_queue(), ...) has finished?

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水波映月 2024-12-14 04:20:31

听起来问题在于，虽然一些内部内容在一个线程中执行，但您的模型处于不一致的状态，reloadData无法正确处理。

您是否在充分设置目录条目之前将其添加到其父目录中？

回复收藏 0 原文

幻想少年梦 2024-12-14 04:20:31

虽然已经晚了，但看起来像这样编写 readDir: 会更有意义：

-(void)readDir:(NSString*)path {
   //////////
   //// some internal stuff
   //////////

    NSArray* subs = [self getSubDirs:path];
    for (NSString* p in subs) {
        [self readDir:p];
        // now refresh outline with newly acquired info and current data
        dispatch_sync(dispatch_get_main_queue(), ^{ \
          [outlineView reloadData];
        });
    }
}

Late to this one, but it seems like it would make a lot more sense to write your readDir: like this:

-(void)readDir:(NSString*)path {
   //////////
   //// some internal stuff
   //////////

    NSArray* subs = [self getSubDirs:path];
    for (NSString* p in subs) {
        [self readDir:p];
        // now refresh outline with newly acquired info and current data
        dispatch_sync(dispatch_get_main_queue(), ^{ \
          [outlineView reloadData];
        });
    }
}

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