Put start() in ViewDidLoad() causes crash

[Jackson0111]

I have following code in ViewDidLoad() and it causes app crash with error 'Can't add a nil AVCaptureInput' :

override func viewDidLoad() {

    CameraEngine.startup()

    let preview: AVCaptureVideoPreviewLayer = CameraEngine.getPreviewLayer()

    preview.frame = self.view.bounds

    self.view.layer.addSublayer(preview)

    self.view.addSubview(takePhotoButton)

    cameraFlash.setImage(noFlash, forState: .Normal)

    CameraEngine.shareInstance().flash = false

    self.view.addSubview(cameraFlash) // flash light button

    photoLibrary.setImage(album, forState: .Normal)

    self.view.addSubview(photoLibrary) // open photo album button
}

[remirobert]

On simulator maybe ?

[Jackson0111]

yes, only on simulator. Although it doesn't crush on real device, but it doesn't work well with UIPageViewController. I have a pageVC that shows three pages, camera is one of them, when swipe to switch pages UI will pause for a second then switch.

[remirobert]

That's strange. So first the crash on the simulator is "normal". I mean I can also avoid it.
For the second point that's strange. Probably you can start the camera engine, in the AppDelegate.

CameraEngine.startup()

[Jackson0111]

On a real device, it only freezes the UI on the first swipe, after that everything works smoothly.

[remirobert]

Yes ok ! That's because the camera engine in the very first time, is begin to start.
So move the start in the AppDelegate, and everything, will works as expected.

[Jackson0111]

Perfect!!! Thanks! I really love this thing it's simple and great

[remirobert]

Awesome thanks !.