Iphone - is there a way to keep the AE/AF focus lock on always?

So I really like the feature on the iphone when you have the camera open that you can lock the focus so that it isn't constantly refocusing with the autofocus by holding down on the screen for a bit (by enabling the AE/AF lock). However, upon closing the program, or just minimizing it by double tapping the home button and selecting another program, when you come back to the camera the AE/AF lock is no longer activated. Is there a way to keep that lock on either all the time, or so that unless when you come back to the camera after minimizing it's still held on that focus lock?

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