Скачать или смотреть Resolving the UIPickerView Update Issue in iOS Apps

Learn how to fix the issue with `UIPickerView` not getting updated values from an array in your Swift-based iOS application.
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This video is based on the question https://stackoverflow.com/q/66227668/ asked by the user 'Let.Simoo' ( https://stackoverflow.com/u/9546846/ ) and on the answer https://stackoverflow.com/a/66227833/ provided by the user 'Shehata Gamal' ( https://stackoverflow.com/u/5820010/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the UIPickerView Update Issue in iOS Apps

When developing an iOS app, you may occasionally find yourself facing frustrating hurdles. If you’re working on a store app with a UIPickerView and notice that it's not reflecting the updated values from your data array, you’re not alone. This guide will help you understand the problem and implement a straightforward solution.

The Problem

In your store app, the UIPickerView is designed to display a list of product types based on the selected section. However, after selecting a new section, the UIPickerView does not update to display the corresponding products. You’ve verified through debugging that the data in your array (generatedTypes) is correct, but for some reason, the UIPickerView does not reload with the new values.

This issue typically arises because the UIPickerView needs to be informed when data has changed, and it needs to refresh its content based on the latest data changes.

The Solution: Reloading the Picker

To resolve this issue, you need to ensure that the UIPickerView reloads its data after the generatedTypes array has been updated. You can achieve this by modifying the updateTypesarray() function, so it calls the reloadAllComponents() method on the UIPickerView. Below are the steps to implement this fix.

Step 1: Update the updateTypesarray() function

You will add a line of code to reload the UIPickerView after the array assignment in your updateTypesarray() function. Here’s how to do it:

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

Step 2: Test the Changes

Once you’ve made this change, test your app again. You should now observe that selecting a different section updates the UIPickerView with the appropriate product types without any issues.

Conclusion

This fix should resolve the problem of the UIPickerView not showing updated values from the generatedTypes array. By calling reloadAllComponents() after updating your data, you ensure that the UIPickerView stays in sync with your data model.

If you run into further issues or have any questions, don’t hesitate to reach out to the developer community for help. Happy coding!