ios调用摄像头默认为摄像

if(![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

{

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 = [[UIImagePickerController alloc] 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"];

[self presentViewController:pickerVideo animated:YES completion:nil];