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This article mainly explains "how to call UIViewController". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to call UIViewController.

When we call the addChildViewController method, we must call the didMoveToParentViewController method. [child view controller didMoveToParentViewController: parent view controller] before calling the removeFromParentViewController method, the willMoveToParentViewController method must be called, and the parent parameter is nil: [view controller willMoveToParentViewController:nil to be deleted]; this method is called when viewController is added or removed from a view control container.

-(void) willMoveToParentViewController: (UIViewController *) parent- (void) didMoveToParentViewController: (UIViewController *) parent

Parent: parent view controller, parent is the parent view controller when added, parent is nil when deleted

After calling addChildViewController, you must call didMoveToParentViewController:parentViewController:parentVC (if you do not call this method, the didMoveToParent method in chileVC will not be called automatically). WillMoveToParentViewController is called by default.

# pragma mark-add sub-controller-(void) addContentController: (UIViewController*) newVC {[self addChildViewController:newVC]; [self.view addSubview:newVC.view]; [newVC didMoveToParentViewController:self]; / / required to call this willMove:self by the system call} # pragma mark-delete sub-controller-(void) deleteContentController: (UIViewController*) viewController {[viewController willMoveToParentViewController:nil] / / must be called before deletion. The system calls didMove:nil [viewController.view removeFromSuperview]; [viewController removeFromParentViewController] by default. } # pragma mark-switching Sub-Controller (switching)-(void) changeFromViewController: (UIViewController*) oldVC toViewController: (UIViewController*) newVC {[self transitionFromViewController: oldVC toViewController: newVC duration: 0.25 options:0 animations: Nil completion: Nil] } at this point, I believe you have a deeper understanding of "how to call UIViewController". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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