CODEWITHSUNDEEP
swift
David Choi
David Choi

Reputation: 6619

Init inside of UIViewController never called

I would like to use an init inside of my view controller in order to initialize some properties. I've tried creating a default init and overriding the existing ones in UIViewController, and everything compiles without error, but none of them get called. Why is that?

These are my current inits, none are called.

init(){
    cameraSession = AVCaptureSession()
    cameraSession.sessionPreset = AVCaptureSessionPresetLow
    captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) as AVCaptureDevice

    super.init(nibName: nil, bundle: nil)
}

override init(nibName nibNameOrNil: String!, bundle nibBundleOrNil: Bundle!) {
    cameraSession = AVCaptureSession()
    cameraSession.sessionPreset = AVCaptureSessionPresetLow
    captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) as AVCaptureDevice
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
}

required init?(coder aDecoder: NSCoder) {
    cameraSession = AVCaptureSession()
    cameraSession.sessionPreset = AVCaptureSessionPresetLow
    captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) as AVCaptureDevice

    super.init(coder: aDecoder)
}

Upvotes: 1

Views: 65

Answers (2)

Søren Mortensen
Søren Mortensen

Reputation: 1755

Instead of using an initialiser, try initialising the properties with default values using the design-and-call pattern (see http://www.apeth.com/swiftBook/ch02.html#SECdefineandcall and http://www.apeth.com/swiftBook/ch03.html#_computed_initializer), like this:

class ViewController {
    var cameraSession: AVCaptureSession = {
        let session = AVCaptureSession()
        session.sessionPreset = AVCaptureSessionPresetLow
        return session
    }()

    var captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) as AVCaptureDevice
}

Then there's no need for an initialiser at all!

Upvotes: 0

Inder Kumar Rathore
Inder Kumar Rathore

Reputation: 39988

It depends upon how you're creating your view controller object.

If you're using storyboard or xib then this method will be called

required init?(coder aDecoder: NSCoder) {

}

Upvotes: 2

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