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How to change status bar after didenterbackgroud?

I saw the "Sleeping Cycle" application, which changes the color of the status bar to red and is constantly displayed, even if the application is in the background by clicking the "Home" button. I know how to display a notification, but it will not be constantly displayed and changing. Anyone know about this? Please help.

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These are 3 special colors of the status bar:

  • Blue when sharing
  • Green on active call
  • Red when the app uses special phone features in the background (such as a microphone).

In iOS7, you can change the status bar in your application with

  • tintColor , navigationController
  • {0,0, screenWidth, 20}
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