如何动态调整NSMenu的大小以适应其内容？

initial menu

此菜单与此代码创建：

NSMenu *menu = [[NSMenu alloc] init]; 

    NSMenuItem *addMenuItem = [[NSMenuItem alloc] init]; 
    [addMenuItem setTitle:[NSString stringWithFormat:@"Upload"]]; 
    [addMenuItem setHidden:NO]; 
    [addMenuItem setRepresentedObject:contentType]; 
    [addMenuItem setTarget:self]; 
    [addMenuItem setAction:@selector(performSelectedDragOperation:)]; 
    [addMenuItem setTag:operation]; 
    [addMenuItem setEnabled:YES]; 

    [menu addItem:addMenuItem]; 

    NSMenuItem *alterMenuItem = [addMenuItem copy]; 
    [alterMenuItem setTitle:@"Upload in Folder"]; 
    [alterMenuItem setKeyEquivalentModifierMask:NSAlternateKeyMask]; 
    [alterMenuItem setAlternate:YES]; 
    [menu addItem:alterMenuItem]; 
    [alterMenuItem release]; 

    [addMenuItem release]; 

    NSMenuItem *addMenuItem2 = [[NSMenuItem alloc] init]; 
    [addMenuItem2 setTitle:[NSString stringWithFormat:@"EditNewAndUpload"]]; 
    [addMenuItem2 setHidden:NO]; 
    [addMenuItem2 setRepresentedObject:contentType]; 
    [addMenuItem2 setTarget:self]; 
    [addMenuItem2 setAction:@selector(performSelectedDragOperation:)]; 
    [addMenuItem2 setTag:operation]; 
    [addMenuItem2 setEnabled:YES]; 

    [menu addItem:addMenuItem2]; 

    NSMenuItem *alterMenuItem2 = [addMenuItem2 copy]; 
    [alterMenuItem2 setTitle:@"EditNewAndUpload in Folder"]; 
    [alterMenuItem2 setKeyEquivalentModifierMask:NSAlternateKeyMask]; 
    [alterMenuItem2 setAlternate:YES]; 
    [menu addItem:alterMenuItem2]; 
    [alterMenuItem2 release]; 

    [addMenuItem2 release];

正如你可以看到有在菜单中的每个选项“重复”项目。当您按下选项（alt）键以显示菜单时，会显示该项目的副本。

的问题是，菜单尺寸的变化，而这是示出了替代的菜单项，因为这个菜单的标题比原稿更大，它永远不会恢复到原来的大小，从而产生这样的：

enter image description here