Скачать или смотреть How to Detect if UIImagePickerController or UIDocumentPickerController is Opened in iOS

Learn how to effectively manage overlay views in your iOS app by detecting when the `UIImagePickerController` or `UIDocumentPickerViewController` is presented.
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This video is based on the question https://stackoverflow.com/q/68268802/ asked by the user '이재빈' ( https://stackoverflow.com/u/10794086/ ) and on the answer https://stackoverflow.com/a/68338166/ provided by the user 'Manish Punia' ( https://stackoverflow.com/u/3283081/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Detect if UIImagePickerController or UIDocumentPickerController is Opened in iOS

When building iOS applications, managing the presentation of view controllers can pose certain challenges, especially when dealing with modal controllers like UIImagePickerController and UIDocumentPickerViewController. These controllers allow users to pick images and documents, respectively, but can sometimes interfere with custom overlays or views you might have on screen. If you're using an overlay view in your app, it can be frustrating to find that it obstructs interaction with the modal controllers—effectively blocking users from accessing important features like cancel buttons. So, how can you detect when these controllers are opened? Let’s explore.

The Problem Explained

You have a custom overlay view that covers the entire screen while an operation is ongoing. When you are presenting UIImagePickerController or UIDocumentPickerViewController, this overlay seems to block interaction with these controllers—meaning users can’t access the options provided by the picker or even close it. To tackle this, you'll want to adjust the z-position of your overlay view behind the modal controllers when they are presented.

Solutions to the Problem

There are two primary methods to detect when the UIImagePickerController or UIDocumentPickerViewController is being displayed:

1. Overriding the Presentation Method

One effective approach is to override the presentViewController:animated:completion: method in your root view controller. Here’s how you can implement this:

Step 1: In your root view controller, override the presentViewController:animated:completion: method.

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Step 2: Make sure to reset your overlay’s z-position after dismissal if necessary to keep the interaction smooth for user actions.

2. Handling Presentation From Your Source Code

If you are the one initiating these controllers from your source code, another simple way is to manage the overlay view state right before presenting the picker or document controller. Here’s how you can do it:

Before presenting your controller: Simply set the z-position of your overlay view to a lower value as you are about to present UIImagePickerController or UIDocumentPickerViewController.

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Conclusion

By implementing either of these methods, you will efficiently manage the presence of your overlay view when using modal controllers in your iOS app. Not only does this enhance the user experience by preventing interaction issues with essential controls, but it also makes your application feel more polished and cohesive.

Feel empowered to apply these strategies in your development process, and don’t hesitate to explore further customization options to enhance the functionality of your app!