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iPhone: Secure container

开发者 https://www.devze.com 2023-03-31 15:23 出处：网络

We\'re building an app that will download confidential PDF data. Once downloaded, it must be displayed securely. No copy/pasting allowed, or other ways of getting the data off the device. Eyes-o开发者

相关专题：security webview

We're building an app that will download confidential PDF data. Once downloaded, it must be displayed securely. No copy/pasting allowed, or other ways of getting the data off the device. Eyes-o开发者_开发百科nly reading.

Is there a way to make the webView container act as such a secure container to display these PDFs?

This is not 100% fool-proof in practice. You won't be able to prevent the user from taking a screenshot using the Home-Power button combination, or take a picture of the phone screen with another phone.

I guess you can draw the PDF data onto a UIImage and display that. Also, just keep the data in memory and don't persist it to disk.

Use a CGImageRef in Quartz2D and create a UIImage with that representation, then use good 'ol UIImagePNGRepresentation on the created UIImage. Then, make sure you release all the objects in the viewWillDisappear or similar.