I am develop IOS App ,and run the App on my iPhone.
I press the Home Button on iPhone , but when I click twice for Home button and turn to my App , it show the View like the following picture. The View is Disappear when I went back.

But I don't close the view at the viewDidDisappear or viewWillDisappear.
And then when I click the App , it show the blank View like the following picture.

I have no idea about this...Can someone help me ?