Скачать или смотреть How to Dismiss Presented View Controllers in your iOS App using Swift

Learn how to effectively dismiss presented view controllers in your iOS app. Discover why using `popToRootViewController` might not work and the correct approach to solve the issue.
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This video is based on the question https://stackoverflow.com/q/63013637/ asked by the user 'Unterbelichtet' ( https://stackoverflow.com/u/13693395/ ) and on the answer https://stackoverflow.com/a/63013757/ provided by the user 'Jawad Ali' ( https://stackoverflow.com/u/1780632/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dismiss Presented View Controllers in your iOS App using Swift

When developing an iOS application in Swift, particularly when utilizing Storyboards, you might find yourself wrestling with view controller management. A common scenario arises when you have multiple view controllers presented on top of one another, and you'd like to dismiss them with a button press.

One effective way to navigate between these controllers is by using self.navigationController?.popToRootViewController(animated: true). However, some developers discover that this command does not dismiss the presented view controllers as they expected. Let’s dive into this issue and explore a proper solution.

Understanding the Problem

In your app, you might have two or more view controllers presented modally (i.e., appearing on top of others). The goal is to dismiss these controllers and return to the root controller or main interface.

When you use:

[[See Video to Reveal this Text or Code Snippet]]

You may notice that it does not dismiss the presented controllers correctly. This can be confusing, especially if you've come across it while searching for a solution in forums like StackOverflow.

Why popToRootViewController Might Not Work

The issue stems from the nature of how presented view controllers function in iOS. The popToRootViewController method is designed for use in navigation controllers, and may not handle dismissed presented view controllers properly, especially if they have been added on top of the navigation stack.

Check Navigation Controller

Before delving into the solution, it's critical to ensure that your navigation controller is not nil. You can verify this with the following piece of code:

[[See Video to Reveal this Text or Code Snippet]]

If your navigation controller is indeed nil, the pop function will not perform as intended.

The Solution

Instead of using popToRootViewController, a different approach is needed to dismiss those presented view controllers effectively. Here is the work-around that can be employed:

Dismiss Directly From Root View Controller

You can directly dismiss the presented view controllers by accessing the root view controller. Try this piece of code:

[[See Video to Reveal this Text or Code Snippet]]

How it Works:

This line of code will target the root view controller (the one that started the presentation of other view controllers).

By invoking dismiss(animated: true), it effectively dismisses all presented view controllers, providing a smooth return to the main interface.

Practical Use

Place this code in the action of the button you want to use for dismissing the view controllers.

Test the functionality to ensure that all presented controllers are dismissed appropriately.

Conclusion

When managing multiple view controllers in an iOS application, it's essential to understand the limitations of the navigation controller methods. By employing the direct dismissal technique shown above, you can effectively handle multiple view controller presentations in a straightforward manner.

Feel free to test out the solution in your application, and don’t hesitate to reach out with further questions or experiences related to Swift iOS development!