Article directory
Preface
There are two ways to launch and exit the interface in iOS - push and present. Next, the author will introduce these two methods respectively.
1. push method
SecondViewController *second = [[SecondViewController alloc] init];
[self.navigationController pushViewController:second animated:YES];
2. pop method
//返回上一级
[self.navigationController popViewControllerAnimated:YES];
//返回根视图
[self.navigationController popToRootViewControllerAnimated:YES];
//返回指定级数 （objectAtIndex:参数为想要返回的级数）
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];
3. present method
SecondViewController *second = [[SecondViewController alloc] init];
[self presentViewController:second animated:YES completion:nil];
4. Dismiss method
[self dismissViewControllerAnimated:YES completion:nil];
5. Dismiss multi-level method
presentedViewController and presentingViewController are two properties in UIViewController.
The difference between PresentedViewController and PresentingViewController
presentedViewController: The view controller that was presented by this
view controller or its nearest ancestor.
presentingViewController: The view controller that presented this view
controller (or its farthest ancestor.) The view controller for this view controller (or its most distant ancestor).
Assume that controller A jumps to controller B through presentation, then A.presentedViewController is controller B;
B.presentingViewController is controller A;
Example
Create four pages ABCD. For example, if we want to go from D->A, we can use the following method:
UIViewController *rootVC = self.presentingViewController;
while (rootVC. presentingViewController ) {
rootVC = rootVC.presentingViewController ;
}
[rootVC dismissViewControllerAnimated:YES completion:nil];
For example, if we want to go from D->B, we can use presenting to jump to the page.
[self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:nil];
The following code can also implement D->B
UIViewController *rootVC = self.presentingViewController;
while (![rootVC isKindOfClass:[SecondViewController class]]) {
rootVC = rootVC.presentingViewController;
}
[rootVC dismissViewControllerAnimated:YES completion:nil];
animation
