ios调用摄像头默认为摄像

            if(![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

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            {

                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误提示" message:@"没有发现摄像头" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];

                [alert show];

                return;

            }

           UIImagePickerController *pickerVideo = [[UIImagePickerControlleralloc]init];

            pickerVideo.sourceType =UIImagePickerControllerSourceTypeCamera;

            pickerVideo.delegate = self;

            pickerVideo.allowsEditing = YES;

            pickerVideo.videoQuality = 2;

            pickerVideo.videoMaximumDuration = 60.0f;

            pickerVideo.cameraDevice =UIImagePickerControllerCameraDeviceFront;

            pickerVideo.mediaTypes = [NSArray arrayWithObject:@"public.movie"];

            [selfpresentViewController:pickerVideoanimated:YEScompletion:nil];