我有一个带有菜单按钮的导航控制器。当按下菜单按钮时，当前视图（连同其导航栏）应该向右滑动，并且菜单应该同时并连续地从左侧滑入。详细信息在下面的代码中的注释中进行了解释。
除了一方面，它有效。当前视图（在本例中为“对话”），当添加回我实现的容器视图时，必须将其框架设置为“y.min”=-20，否则导航栏上方有 20 个像素。但是，当我将它的 y.min 设置为 -20 时，这会将其视图中的所有内容向上移动 20 个像素。因此，当按下菜单按钮时，当前视图中的所有内容都会突然向上跳跃 20 个像素。
我无法弄清楚为什么会发生这种情况或如何纠正这种情况。也有可能有一种更简单的方法可以解决所有这些问题，但我不知道有一个。*（*我对第三方文件不感兴趣。我想自己学做。）
这是代码：
- (IBAction) showMenu:(id)sender
{
// get pointer to app delegate, which contains property for menu pointer
AppDelegate *appDelegate = getAppDelegate;
//create container view so that current view, along with its navigation bar, can be displayed alongside menu
UIView *container = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 548.0f)];
[container setBackgroundColor:[UIColor blueColor]];
//before presenting menu, create pointer for current view, to be used in completion routine
UIView *presenter = self.navigationController.view;
//present menu's VC. it is necessary to present its (table) VC, not just add its view, to retain the functionality of its cells
[self presentViewController:appDelegate.menuVC animated:NO completion: ^{
//obtain a pointer to the menu VC's view
UIView *menuTemp = appDelegate.menuVC.view;
//replace menu VC's view with the empty container view
appDelegate.menuVC.view = container;
//add the menu view to the container view and set its frame off screen
[container addSubview:menuTemp];
menuTemp.frame = CGRectMake(-260.0f, 0.0f, 260.0f, 548.0f);
//add the the view that was displayed when the user pressed the menu button. set its frame to fill the screen as normal
[appDelegate.menuVC.view addSubview:presenter];
presenter.frame = CGRectMake(0.0f, 0.0f, 320.0f, 548.0f);
//animate the 2 subviews that were just added; "PRESENTER"'S FRAME IS THE ISSUE
[UIView animateWithDuration:25.3f delay:0.0f options:nil animations:^{
[menuTemp setFrame:CGRectMake(0.0f, 0.0f, 260.0f, 548.0f)];
[presenter setFrame:CGRectMake(260.0f, -20.0/* or 0 */f, 320.0f, 548.0f)];
} completion:nil];
}];
}
这是我的两个选项的说明（单击以获得更高的分辨率）：
屏幕 1) 第一个屏幕显示单击菜单按钮之前的视图。
接下来的两个屏幕显示菜单转换动画开始时的两种可能性。
屏幕 2) 这是我将 Presenter.frame.y.min 设置为 -20 时的过渡效果。如您所见，视图中的按钮已跳跃了 20 像素。
屏幕 3) 这是当我将 Presenter.frame.y.min 设置为 0 时的过渡效果。如您所见，顶部有一个 20 像素高的条形图。蓝色表示容器视图。
Now show Menu 