How to Build Enhanced App Screen Blur iOS Apps

Last updated March 24, 2024 by Appdome

Learn to Blur Focus Loss in iOS apps, in mobile CI/CD with a Data-Driven DevSecOps™ build system.

What is Blur on Focus Loss?

Appdome’s Blur on Focus Loss builds upon the foundation set by the “Blur Application Screen” function, which blurs the screen of an app when it moves into the background, thus safeguarding sensitive information from being visible in the recent app’s view. Blur of Focus Loss takes this a step further by initiating the blur effect immediately when the app loses focus, rather than waiting until it transitions fully to the background. This timely response ensures that user privacy is protected from the very moment they start to swipe away from the app. It also intelligently manages pop-up windows within the app by applying the blur effect to the screen behind them, thereby enhancing privacy without hindering the user experience.

How Appdome Implements Blur on Focus Loss?

Appdome implements Blur on Focus Loss through a sophisticated mechanism that detects when an app is losing focus in real time, triggering the blur effect instantly to protect user privacy. This implementation is particularly beneficial for apps handling sensitive information, such as financial details, personal data, or confidential communications, as it minimizes the window of opportunity for unauthorized visual access. By blurring the screen as soon as the app begins to transition away from the user’s immediate view, Appdome effectively shields against visual hacking techniques and inadvertent information exposure. The feature offers developers the flexibility to choose how and when the blurring should be applied. With the addition of a sub-toggle within the “Blur Application Screen” settings, developers can opt for this enhanced privacy feature, tailoring the app’s security measures to suit the specific needs and preferences of their user base.

Prerequisites for Using Blur on Focus Loss:

To use Appdome’s mobile app security build system to Blur Focus Loss , you’ll need:

Blur Focus Loss on iOS apps using Appdome

On Appdome, follow these 3 simple steps to create self-defending iOS Apps that Blur Focus Loss without an SDK or gateway:

  1. Upload the Mobile App to Appdome.

    1. Upload an app to Appdome’s Mobile App Security Build System

    2. Upload Method: Appdome Console or DEV-API
    3. iOS Formats: .ipa
    4. Blur on Focus Loss Compatible With: Obj-C, C+, Java, Swift, Flutter, React Native, Unity, Xamarin, Cordova and more
  2. Build the feature: Blur on Focus Loss.

    1. Building Blur on Focus Loss by using Appdome’s DEV-API:

      1. Create and name the Fusion Set (security template) that will contain the Blur on Focus Loss feature as shown below:
      2. fusion set that contains Blur on Focus Loss

        Figure 1: Fusion Set that will contain the Blur on Focus Loss feature
        Note: Naming the Fusion Set to correspond to the protection(s) selected is for illustration purposes only (not required).

      3. Follow the steps in Sections 2.2.1-2.2.2 of this article, Building the Blur on Focus Loss feature via Appdome Console, to add the Blur on Focus Loss feature to this Fusion Set.

      4. Open the Fusion Set Detail Summary by clicking the “...” symbol on the far-right corner of the Fusion Set, as shown in Figure 1 above, and get the Fusion Set ID from the Fusion Set Detail Summary (as shown below): fusion Set Detail Summary image

        Figure 2: Fusion Set Detail Summary
        Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory).

      5. Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, App Center, Jenkins, Travis, Team City, Cirlce CI or other system:
        1. Build an API for the app – for instructions, see the tasks under Appdome API Reference Guide
        2. Look for sample APIs in Appdome’s GitHub Repository
    2. Building the Blur on Focus Loss feature via Appdome Console

      To build the Blur on Focus Loss protection by using Appdome Console, follow the instructions below.

      1. Where: Inside the Appdome Console, go to Build > Security Tab > Mobile Privacy section.
      2. When you select the Blur on Focus Loss you'll notice that your Fusion Set you created in step 2.1.1 now bears the icon of the protection category that contains Blur on Focus Loss

        Fusion Set applied Blur on Focus Loss

        Figure 4: Fusion Set that displays the newly added Blur on Focus Loss protection

      3. Click Build My App at the bottom of the Build Workflow (shown in Figure 3).
    Congratulations!  The Blur on Focus Loss protection is now added to the mobile app

Using Appdome, there are no development or coding prerequisites to build secured iOS Apps by using Blur on Focus Loss. There is no SDK and no library to code or implement in the app and no gateway to deploy in your network. All protections are built into each app and the resulting app is self-defending and self-protecting.

Releasing and Publishing Mobile Apps with Blur on Focus Loss

After successfully securing your app by using Appdome, there are several available options to complete your project, depending on your app lifecycle or workflow. These include:

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If you have any questions, please send them our way at or via the chat window on the Appdome platform.

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Thanks for visiting Appdome! Our mission is to secure every app on the planet by making mobile app security easy. We hope we’re living up to the mission with your project.

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