检测iPhone的电源关闭事件以防止在iOS中截屏

Question

I'm working on the feature to prevent ScreenShot taken from my application. We can achieve this by Configuration Profile which available on Enterprise Developer Account. The thing is i want to do it in Developer Account. So i'm tried below techniques

1. Observing the UIApplicationUserDidTakeScreenshotNotification notification. But it was triggered after the screen shot taken.
2. Tried to use a touchesCancelled: method. From iOS7 onwards touchesCancelled: is not called during screenshot taken.

3. When i'm looking on device log, the below outputs was logged.

   Mar 14 13:05:58 iPod backboardd[58] : Lock usagePage:0xc usage:0x30 downEvent:1 down Mar 14 13:05:58 iPod SpringBoard[53] : canceling volume button presses
   Mar 14 13:05:59 iPod backboardd[58] : Home usagePage:0xc usage:0x40 downEvent:0 up
   Mar 14 13:05:59 iPod SpringBoard[53] : Take screenshot: 3
   Mar 14 13:05:59 iPod ScreenShot[4689] : Name :::_UIWindowSystemGestureStateChangedNotification Mar 14 13:05:59 iPod backboardd[58] : Lock usagePage:0xc usage:0x30 downEvent:0 up
   Mar 14 13:05:59 iPod backboardd[58] : Home usagePage:0xc usage:0x40 downEvent:0 phase:0x4 timeout
   Mar 14 13:05:59 iPod SpringBoard(FrontBoard)[53] : [FBSystemService][0x7bd4] Received request to open "com.apple.ScreenshotServicesService" from SpringBoard:53.
   Mar 14 13:05:59 iPod SpringBoard[53] : sending screenshot action to scene:
   Mar 14 13:05:59 iPod SpringBoard(FrontBoard)[53] : [FBSystemService][0x5ca0] Received request to open "com.apple.ScreenshotServicesService" from SpringBoard:53.
   Mar 14 13:05:59 iPod SpringBoard(FrontBoard)[53] : [FBSystemService] Trusting entitled client .

3.1 Tried to trace the device logs using ASL . This is also deprecated.

3.2 Tried to access the system processes using sysctl() . This is also deprecated

3.3 Tried to access the iPhones Private Frameworks to Swizzle the methods on it. But no luck i can't find correct method to swizzle. I know this is not recommended just i'd tried.

Is there any solutions to obtain this case before screen shot is taken, so that i'll change the Application UI.

Thanks.,

Answer 1

看一看https://screenshieldkit.com ，我认为它们满足了您的需求，并且通过使用UIApplicationUserDidTakeScreenshotNotification，您还可以通知其他用户已使用screenShot

Answer 2

You can't.

The only publicly available API is to know that a screenshot is already taken , but it doesn't allow to prevent it (it informs after the screenshot was made).

Yes, on older iOS versions it used to be possible to surpass this restriction, but on newer iOS versions this is not possible yet (at least not without jailbreaking).

Anyway, that's a native option given by iOS, so blocking it would lead to app rejection in the App Store anyway. You should implement other techniques like Instagram Stories and stuff like that do: they inform the publisher of the content that a screenshot was taken.