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Why is my UIViewController initializer never called?


Why is my UIViewController initializer never called?

By : user3864385
Date : January 10 2021, 01:47 PM
wish helps you When an object is initialized from nib/xib, the -initWithCoder: method will be used for initialization.
-initWithNibName:… is never used in unarchiving.
code :


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Why is my the designated initializer of UIViewController never called?

Why is my the designated initializer of UIViewController never called?


By : user2390265
Date : March 29 2020, 07:55 AM
To fix this issue From the iOS Resource Programming Guide
UIViewController designated initializer vs loadView method

UIViewController designated initializer vs loadView method


By : Mahmoud Mokhtari
Date : March 29 2020, 07:55 AM
To fix this issue The purpose of -loadView is to, uh, load the view. It's called when you access the view controller's view property and the value of that property is nil. In this case, you're accessing self.view in your initializer, so that's when -loadView gets called. You set the view's background after that happens, so the view ends up with a green background.
How do I make a custom initializer for a UIViewController subclass in Swift?

How do I make a custom initializer for a UIViewController subclass in Swift?


By : marmuree
Date : March 29 2020, 07:55 AM
hop of those help? Apologies if this has been asked before, I've searched around a lot and many answers are from earlier Swift betas when things were different. I can't seem to find a definitive answer.
code :
class ViewController: UIViewController {

    var imageURL: NSURL?

    // this is a convenient way to create this view controller without a imageURL
    convenience init() {
        self.init(imageURL: nil)
    }

    init(imageURL: NSURL?) {
        self.imageURL = imageURL
        super.init(nibName: nil, bundle: nil)
    }

    // if this view controller is loaded from a storyboard, imageURL will be nil

    /* Xcode 6
    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    */

    // Xcode 7 & 8
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}
Getting a UIVIewController from a storyboard by overriding it's designated initializer

Getting a UIVIewController from a storyboard by overriding it's designated initializer


By : user3721053
Date : March 29 2020, 07:55 AM
Hope this helps You're mixing allocation with initialization.
init initializes an object that's been allocated.
What initializer called in convenience init of UIViewController?

What initializer called in convenience init of UIViewController?


By : Craft1n3ss
Date : March 29 2020, 07:55 AM
wish of those help UIViewController.init calls UIViewController.init(nibName: nil, bundle: nil). That means that the nibName will be equal to the name of the class and bundle will be the main bundle.
UIViewController.init is just a convenience initializer. In swift this could be implemented using default parameters UIViewController.init(nibName: String? = nil, bundle: NSBundle? = nil) but this is an old Objective-C API and Objective-C does not have default parameters and that's why there is a separate convenience init().
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