ios - Change videoview frame in AVCam -

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i used avcam version of 3.1. set video gravity avlayervideogravityresizeaspectfill. want change frame 

- (void)setsession:(avcapturesession *)session {    ((avplayerlayer *)[self layer]).videogravity = avlayervideogravityresizeaspectfill;    [((avplayerlayer *)[self layer]) setframe:cgrectmake(0, 0, 320, 240)];    [(avcapturevideopreviewlayer *)[self layer] setsession:session]; }

but when run project, video frame not change or has different frame size. found videorectobject in avcam . object property readonly, can not set it. how can solve problem ?


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