Скачать или смотреть Mastering UIViewController Dismiss and Pop Logic in Swift

Learn how to efficiently dismiss and pop a view controller in Swift with one action. This guide provides clear examples and step-by-step instructions for iOS developers.
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This video is based on the question https://stackoverflow.com/q/71419006/ asked by the user 'Poornima Mishra' ( https://stackoverflow.com/u/16841560/ ) and on the answer https://stackoverflow.com/a/71421274/ provided by the user 'Subramanian Mariappan' ( https://stackoverflow.com/u/12177617/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering UIViewController Dismiss and Pop Logic in Swift: A Complete Guide

Navigating between view controllers is a common task in iOS development, but it can sometimes become tricky, especially when it comes to dismissing and popping multiple views in a single action. In this guide, we’ll break down a scenario involving three view controllers and provide a clean solution to the issue of navigating back from a popup view controller to the initial view controller (MyDownloadsViewController).

The Problem

Let's set the scene: You have three view controllers set up in your iOS application:

MyDownloadsViewController - The initial view controller.

ImagePreviewViewController - The view controller that you navigate to from MyDownloadsViewController.

DeletePopupViewController - A modal popup presented from ImagePreviewViewController.

The goal is to seamlessly navigate back to MyDownloadsViewController after dismissing DeletePopupViewController. The current code setup attempts to accomplish this but fails, likely due to the dismissal process leaving the presenting view controller instance as nil.

Here's an overview of the existing code for clarity:

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

Despite this code, you experience no change when trying to dismiss and pop back, indicating that we need to revise the method for accessing the presenting view controller.

The Solution

To solve the problem, we need to retain a reference to the presenting view controller before the dismissal occurs. By doing this, we can ensure that we properly navigate back after the modal is dismissed. Here’s how you can implement this:

Step 1: Store the Presenting View Controller

Before dismissing the DeletePopupViewController, store a reference to the presenting view controller:

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

Step 2: Dismiss and Pop

Next, dismiss the popup and use the stored reference to pop back to the MyDownloadsViewController:

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

Full Implementation

Here’s the complete implementation for the DeletePopupViewController:

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

Conclusion

Navigating back through multiple levels of view controllers can be straightforward when you maintain the right references. By following the solution we outlined, you can ensure that your app behaves as expected, allowing you to dismiss a popup and pop back all in one smooth operation. This method provides solid control over the view controller stack for better user experience in your iOS application.

By mastering this approach, you can enhance your iOS app's navigation flow, making it more intuitive and efficient. Happy coding!