如何動態調整NSMenu的大小以適應其內容？

initial menu

此菜單與此代碼創建：

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單中的每個選項「重複」項目。當您按下選項（alt）鍵以顯示菜單時，會顯示該項目的副本。

的問題是，菜單尺寸的變化，而這是示出了替代的菜單項，因爲這個菜單的標題比原稿更大，它永遠不會恢復到原來的大小，從而產生這樣的：

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