I've noticed some interesting behavior with an app in iOS7. The navbar normally has the following color:
On all real devices, when the app is backgrounded or opened up, the navbar is temporarily covered with a black almost gradient mask that looks like this:
In the simulator, when the app is open and is backgrounded, I get the same black mask over it but the black is slightly shorter from top to bottom, but when it is opened up again I get the following weird white streak:
This is all temporary, and once the app finishes launching it goes away. Does anyone know what would cause this to happen?