How to set up uniapp to disable screenshots

With the development of mobile applications, more and more applications need to consider security issues, among which preventing screenshots has become a topic of increasing concern. For developers who use uni-app to develop mobile applications, how to set up a ban on screenshots has become a necessary skill.

First of all, we need to understand what a screenshot is. Taking a screenshot, as the name suggests, is to copy the content currently displayed on the screen to the clipboard or store it as an image file for the convenience of users. For certain application scenarios, such as payment, private information, e-books, etc., we need to prohibit users from taking screenshots to protect user privacy and copyright.

So how to disable screenshots in uni-app? Below are some commonly used solutions.

1. Use CSS styles to prohibit saving images

CSS provides a user-select attribute, which is used to restrict the user's selection operation, thereby restricting the user from taking screenshots or Copy and other operations. We can set this property to none to prevent users from selecting content in the application. The specific implementation method is as follows:

html,body {
    -webkit-user-select: none;
    user-select: none;
}

By applying this style to the html and body tags, users can be prohibited from taking screenshots, copying, etc. by selecting the content.

The advantage of this solution is that it is simple and practical, but the disadvantage is that it cannot completely prohibit users from taking screenshots. Users can bypass this restriction through other means (such as taking a screenshot of the entire screen or using a third-party screenshot app).

2. Use screenshot detection technology

Screen capture detection technology can determine whether a screenshot has occurred by detecting the size and color of certain designated areas on the screen. If you find that the screen content has been intercepted, you can implement some security measures, such as force quitting the application, hiding sensitive content, etc. This technology needs to be implemented with the help of third-party libraries. Available libraries include [ScreenDetector](https://github.com/ZhongTaoTian/ScreenDetector), [ScreenShield](https://github.com/satron/ScreenShield), etc.

You need to pay attention to the following points when using screenshot detection technology:

• This technology can only determine whether the screen has been intercepted, and cannot prevent the occurrence of screenshot operations.
• The detection process requires a lot of calculations and comparisons, which can easily affect the performance of the application.
• The screen ratio, resolution and other factors of different devices will affect the detection results.

3. Use the screenshot API provided by the iOS system

If your application only needs to run on iOS devices, you can consider using the screenshot API provided by the iOS system to prevent screenshots . This method requires obtaining relevant APIs from official documents and then developing them.

The specific steps are as follows:

• Capture each frame of screen image through AVAssetWriterInputPixelBufferAdaptor in the AVAssetWriter class.
• Encrypted storage and transmission of screen images to the cloud.
• Decrypt in the cloud, and send the decrypted image back to the client and display it.

This solution can protect the privacy and copyright of applications to a certain extent, but it requires developers to have a high technical level and is only applicable to iOS devices.

In short, prohibiting screenshots is a part that cannot be ignored in today's mobile application development. Developers need to consider how to enhance the security of their applications based on the characteristics of their own applications. The above are some commonly used solutions, I hope they can bring you some reference and inspiration.

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