将窗口显示为模态的问题

Question

我正在尝试在mac应用程序的视图中显示NSWindowController类作为模态表 问题是默认模态来自向下滑动。

  SettingWindowController *obj=[[SettingWindowController alloc]      initWithWindowNibName:@"SettingWindowController"];
   [NSApp beginSheet:obj.window
   modalForWindow:[self.view window]
    modalDelegate: self
   didEndSelector: @selector(didEndSheet:returnCode:contextInfo:)
      contextInfo: nil];

当我执行上面的代码时，它只是在视图外打开第二个窗口控制器。

如何通过滑动获得默认行为，即视图从上到下。

Answer 1

 -(IBAction)showModel:(id)sender  {
    obj=[[SettingWindowController alloc] initWithWindowNibName:@"SettingWindowController"]; obj.delegate=self; [NSApp beginSheet:obj.window    modalForWindow:[self.view window]
    modalDelegate: self    didEndSelector: @selector(didEndSheet:returnCode:contextInfo:)
      contextInfo: nil];    }



- (void)didEndSheet:(NSWindow *)sheet returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo
  {
[obj.window orderOut:self];
    }
-(void)showModelEnd
 {
[NSApp endSheet:obj.window];

 }

Answer 2

 -(IBAction)showModel:(id)sender
 {
    obj=[[SettingWindowController alloc] initWithWindowNibName:@"SettingWindowController"];
obj.delegate=self;
[NSApp beginSheet:obj.window
   modalForWindow:[self.view window]
    modalDelegate: self
   didEndSelector: @selector(didEndSheet:returnCode:contextInfo:)
      contextInfo: nil];
   }
 - (void)didEndSheet:(NSWindow *)sheet returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo
  {
[obj.window orderOut:self];

    }
-(void)showModelEnd
 {
[NSApp endSheet:obj.window];

 }