objective c - iOS: UIImagePicker or AVCam for this functionality -

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i looking way add custom button on camera preview , don't know go. ios native camera, on left of capture button, can click on , access photo library. how can add button camera preview view? kind enough give directions? in advance.

take @ uiimagepickercontroller's cameraoverlayview. lets lay own interface on top of default camera interface.


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