objective-c - 应用程序终止期间 NSDocument saveDocumentWithDelegate 死锁

Question

NSDocument 仍然是软件维护的噩梦。

其他任何人都希望同步处理某些阻塞对话框的问题吗？

开始编辑:我可能已经找到了一个允许我同步等待的解决方案

任何人都可以验证这将是“Apple 批准”的解决方案吗？

static BOOL sWaitingForDidSaveModally = NO;
BOOL gWaitingForDidSaveCallback = NO; // NSDocument dialog calls didSave: when done



...
  gWaitingForDidSaveCallback = true;
  [toDocument saveDocumentWithDelegate:self 
                       didSaveSelector:@selector(document:didSave:contextInfo:)  
                           contextInfo:nil];
   if ( gWaitingForDidSaveCallback )
   {
      // first, dispatch any other potential alerts synchronously
      while ( gWaitingForDidSaveCallback && [NSApp modalWindow] )
         [NSApp runModalForWindow: [NSApp modalWindow]];

      if ( gWaitingForDidSaveCallback )
      {
         sWaitingForDidSaveModally = YES;
         [NSApp runModalForWindow: [NSApp mbWindow]]; // mbWindow is our big (singleton) window
         sWaitingForDidSaveModally = NO;
      }
   }
...


- (void)document:(NSDocument *)doc didSave:(BOOL)didSave contextInfo:(void  *)contextInfo
{
   [self recordLastSaveURL];
   gWaitingForDidSaveCallback = NO;
   if ( sWaitingForDidSaveModally )
      [NSApp stopModal];

}

结束编辑

我要支持雪豹/狮子/ML

应用程序终止是一个丑陋的过程。
当用户决定退出，并且文档有需要保存的更改时，我称之为:

  gWaitingForDidSaveCallback = true;
  [toDocument saveDocumentWithDelegate:self 
                       didSaveSelector:@selector(document:didSave:contextInfo:)  
                           contextInfo:nil];

我真的真的很希望这个调用是同步的，但是在最新的 Lion 中，这会挂起我的应用程序:

   while ( gWaitingForDidSaveCallback )
   {
      // didSave: callback clears sWaitingForDidSaveCallback
      // do my own synchronous wait for now
      [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceReferenceDate:0.05]];
   }

我对挂起的最佳猜测是 mouseDown: 窗口关闭按钮
正在混淆 NSDocument。

所以现在，我必须返回，并在我的应用程序主循环中添加不可维护的状态机逻辑，以防止用户执行各种危险的热键。

好吧，所以我笑着忍受它，然后又遇到了另一个障碍!

在以前的操作系统版本/SDK 中，[NSApp modalWindow] 会在它出现时返回一个窗口
处于这种状态。现在不行了!咕噜噜...
NSDocument 处于这种状态时没有 API 可以测试!

所以，现在没有机制来全局检查这个状态!
我必须向我的状态机添加另一个状态变量。

任何人都有针对此问题的更清晰的解决方案，适用于所有操作系统版本和所有当前(和 future )SDK？

Answer 1

更好的方法是将未保存的文档保存在链中。这很容易:

// Catch application terminate event
-(NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
  NSDocumentController *dc = [NSDocumentController sharedDocumentController];
  for (NSInteger i = 0; i < [[dc documents] count]; i++)
  {
    Document *doc = [[dc documents] objectAtIndex:i];
    if ([doc isDocumentEdited])
    {
      // Save first unsaved document
      [doc saveDocumentWithDelegate:self
                    didSaveSelector:@selector(document:didSave:contextInfo:)
                        contextInfo:(__bridge void *)([NSNumber numberWithInteger:i + 1])]; // Next document
      return NSTerminateLater;  // Wait until last document in chain will be saved
    }
  }
  return NSTerminateNow;  // All documents are saved or there are no open documents. Terminate.
}

...

// Document saving finished
-(void)document:(NSDocument *)doc didSave:(BOOL)didSave contextInfo:(void  *)contextInfo
{
  if (didSave)  // Save button pressed
  {
    NSDocumentController *dc = [NSDocumentController sharedDocumentController];
    NSInteger nextIndex = [(__bridge NSNumber *)contextInfo integerValue];
    for (NSInteger i = nextIndex; i < [[dc documents] count]; i++)
    {
      Document *doc = [[dc documents] objectAtIndex:nextIndex];
      if ([doc isDocumentEdited])
      {
        // Save next unsaved document
        [doc saveDocumentWithDelegate:self
                      didSaveSelector:@selector(document:didSave:contextInfo:)
                          contextInfo:(__bridge void *)([NSNumber numberWithInteger:nextIndex + 1])]; // Next document
        return;
      }
    }
    [NSApp replyToApplicationShouldTerminate:YES];    // All documents saved. Terminate.
  }
  else [NSApp replyToApplicationShouldTerminate:NO];  // Saving canceled. Terminate canceled.

}