Change UIViewController self.view frame

问题:

I am trying to display a viewController xib view with its view displayed under a fixed header banner (0,0,320,44) which is an imageView added on Application window.

This is because I need it to stick on the screen while I navigate multiple view controllers. Its a requirement of the project I am doing.

So far I have tried:

• Resizing the XIB view to the appropriate frame size (0,0,320,416), both with dot notation and setter.

• Changing the frame in viewDidLoad with self.view.frame = CGRectMake(0, 44, 320, 416);

but it is not working. Any suggestion?

回答1:

Set the frame in viewWillAppear

- (void)viewWillAppear:(BOOL)animated
{
     self.view.frame = CGRectMake(0, 44, 320, 416);
    [super viewWillAppear:animated];
}

回答2:

Just want to add a bit more. The reason for changing view of a UIViewController does not work in viewDidLoad is because of the call [window makeKeyAndVisible], which is usually called after your viewDidLoad. This call will change the frame of the window.rootViewController to equal the window's frame. You can test this by changing the UIViewController's view.frame AFTER [window makeKeyAndVisible], and the changes will stick.

viewWillAppear and viewDidAppear are called within [window makeKeyAndVisible] but after the view's frame got resized.

The caveat is that only the top most controller which is the rootViewController has its view's frame changed automatically. This DOES NOT affect any childViewControllers attached to the rootViewController.