ios - Camera Preview Not Fitting To UIView -

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i'm making camera , i've decided make sort of square instagram camera , iphone default camera. i'm encountering problem image doesn't fit uiview. below example of happening. uiview should covering red edges left , right.

here code starts session...

func reloadcamera() {      cameraview.backgroundcolor = uicolor.clearcolor()      capturesession = avcapturesession()      capturesession!.sessionpreset = avcapturesessionpresethigh      let backcamera = avcapturedevice.defaultdevicewithmediatype(avmediatypevideo)     if (camera == false) {         let videodevices = avcapturedevice.deviceswithmediatype(avmediatypevideo)          device in videodevices {             let device = device as! avcapturedevice             if device.position == avcapturedeviceposition.front {                 capturedevice = device                 break              } else {                 capturedevice = backcamera             }         }      } else {         capturedevice = avcapturedevice.defaultdevicewithmediatype(avmediatypevideo)     }      {         let input = try avcapturedeviceinput(device: capturedevice)         if capturesession!.canaddinput(input) {             capturesession!.addinput(input)              stillimageoutput = avcapturestillimageoutput()             stillimageoutput!.outputsettings = [avvideocodeckey: avvideocodecjpeg]             if capturesession!.canaddoutput(stillimageoutput) {                 capturesession!.addoutput(stillimageoutput)                  previewlayer = avcapturevideopreviewlayer(session: capturesession)                 previewlayer!.videogravity = avlayervideogravityresizeaspect                 previewlayer!.connection?.videoorientation = avcapturevideoorientation.portrait                 cameraview.layer.addsublayer(previewlayer!)                 previewlayer?.frame = cameraview.bounds                  capturesession!.startrunning()             }         }     } catch let error nserror {         // handle errors         print(error)     }  }

there no constraint issues whatsoever , i've tried deleting elements , having code above run didn't work. tell me if need more information. thanks! (:


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