Intercept the change from portrait to landscape mode during app execution

Hi I don't understand how to intercept if the user rotate the phone in from portarait to landscape or from landscape to portrait. I know that there are few methods:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInte开发者_如何学运维rfaceOrientation)interfaceOrientation

but If I put this method in AppDelegate.

Anyone can help me?

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Those are not UIApplicationDelegate methods, so your AppDelegate won't receive them.

They're implemented in UIViewController and you can override them in one of your view controllers (subclasses of UIViewController)

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You need to implement these delegate methods into your viewcontroller then whenever your view controller rotates. You will get response in respective delegtes.

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You can use this in any or all of the view controllers that u are using. That will intercept the change for that particular view controller. Those are UIViewController delegates and are not accessible by appDelegate

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Andrea you can implement those methods in your viewcontroller and your view controller is responsible to call those delegate methods

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if (interfaceOrientation == UIInterfaceOrientationPortrait) {}
    else {}
}