Скачать или смотреть Solving Navigation Bar Crashes in iOS Development: A Guide to Fix Common Issues

Are you experiencing crashes when navigating using a navigation bar in your iOS app? This guide addresses common issues with navigation controllers in Swift and provides clear solutions.
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Solving Navigation Bar Crashes in iOS Development: A Guide to Fix Common Issues

Creating a robust navigation system is vital when building iOS applications, especially when using Swift. However, many developers encounter issues like an improperly displayed second view controller and crashes upon navigating back. This guide will help you identify common pitfalls and provide clear solutions.

The Problem: Crashes and Unresponsive Navigation

In your application, you might face two significant problems:

Floating View Controller: The second view controller does not appear at full screen, instead floating above the first view.

Crashing on Back Navigation: Pressing the back button, which you have labeled "Volver", leads to an application crash.

The crash you are facing is a common issue caused by incorrect selector references in your code. Let’s look at how to resolve these problems step-by-step.

Solution Overview

Step 1: Display the Second View Controller in Full Screen

To ensure your second view controller (in this case, RegistroViewController) appears in full screen, you need to set the modalPresentationStyle property of your navigation controller. By default, Swift does not always display it in a full-screen format.

Here’s how to fix this:

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

Additional Note:

If you prefer a different transition effect, you can modify the transition style with the following line:

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

Step 2: Fixing the Selector for the Back Button

The crash due to unrecognized selector is a common error. This typically happens when the target for your button action is misconfigured.

In your code, you set the back button's selector to point to a method goBack within UIWebView, which is incorrect. Instead, this method needs to be defined in the RegistroViewController.

Here's an example of how to correctly point your button to the goBack method:

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

Make sure to implement the goBack method appropriately in the RegistroViewController:

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

Summary

Navigating through Swift apps needs attention to detail, especially regarding view controllers and their presentation styles. By following the steps outlined above:

Set modalPresentationStyle to .fullScreen to ensure full screen display.

Ensure that the back button correctly references the goBack function in the appropriate view controller.

With these adjustments, your navigation issues and app crashes should be resolved, offering a smoother user experience. Happy coding!