We've just counted the new features in iOS 7 Beta 2, and the readers of foreign media macrumors have revealed a small change that disappears in Beta 2. In iOS 7, screenshots were prompted, and the release notes said, "When a user needs a screenshot, the touch action of the activity will no longer cancel (block) the screenshot." This small change will affect multiple applications that rely on screenshots to detect "unwanted behavior" by users, such as Snapchat and Facebook Poke.
When a user opens a Snapchat picture for browsing, he needs a finger on the screen to keep the picture open. The screen operation will also interrupt the operation of photo browsing and close the picture. This is also the method used by Snapchat to detect "illegal screenshots".
In iOS 7, the screenshot will no longer interrupt Snapchat to browse the picture and close it, so even if you cut a picture to the screen, you won't be notified. Since the iOS 7 screen shot will not interrupt the touch action on the screen, the picture will remain open and the application will no longer be able to identify the screenshot.
It seems that Snapchat and other applications to find a new way.