iOS Camera go black box

When customizing the camera, call the system's camera, due to the resolution of the camera, there will be a short rectangular box, always appear black border, such as:

If you want to implement a full-screen camera, you can do this:

            Calayer *viewlayer = Self.imagePickerController.view.layer;            [Viewlayer setbounds:cgrectmake (0.0, 0.0, 125.0, 132.0)];            [Viewlayer Setbackgroundcolor:[uicolor Bluecolor]. Cgcolor];            [Viewlayer setcontentsrect:cgrectmake (0.0, 0.0, 115.0, 112.0)];            [Viewlayer setborderwidth:.0];            [Viewlayer Setbordercolor:[uicolor Whitecolor]. Cgcolor];            

Effects such as:

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