lifecycle.swift

import UIKit

class ViewController: UIViewController {
    
    override func loadViewIfNeeded() {
        super.loadViewIfNeeded()
        print(#line)
        // Loads the view controller's view if it has not already been set.
    }
    
    override func loadView() {
        super.loadView()
        print(#line)
        // This is where subclasses should create their custom view hierarchy if they aren't using a nib. Should never be called directly.
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        print(#line)
        // Called after the view has been loaded. For view controllers created in code, this is after -loadView. For view controllers unarchived from a nib, this is after the view is set.
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        print(#line)
        // Called when the view is about to made visible. Default does nothing
    }
    
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        print(#line)
        // Called just before the view controller's view's layoutSubviews method is invoked. Subclasses can implement as necessary. The default is a nop.
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        print(#line)
        // Called just after the view controller's view's layoutSubviews method is invoked. Subclasses can implement as necessary. The default is a nop.
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print(#line)
        // Called when the view has been fully transitioned onto the screen. Default does nothing
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        print(#line)
        // Called when the view is dismissed, covered or otherwise hidden. Default does nothing
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        print(#line)
        // Called after the view was dismissed, covered or otherwise hidden. Default does nothing
    }
}