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I would like to reload my view so that viewDidLoad redoes all of its work. How can I do that in Swift?
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viewDidLoad() is one of the initialization methods that is called on the initial view controller. viewDidLoad() is called before anything is shown to the user - and it is called only once.
viewWillAppear(_:)Always called after viewDidLoad (for obvious reasons, if you think about it), and just before the view appears on the screen to the user, viewWillAppear is called.
viewDidLoad ONLY gets called when the view is constructed - so for example after a view controller initFromNibNamed call when the view is accessed. viewWillAppear is called anytime your view controller was not in view but comes into view - so when your view controller is pushed, viewWillAppear is called.
viewViewDidLoad and viewWillAppear are part of the view controller lifecycle and are called automatically by iOS after your UIViewController got instantiated and before the view appears on the screen. You can call them anywhere in your view controller class, but that's not at all good practice and I would never recommend you to do so!
If you have code that you want to be executed at multiple times during the lifetime of your view controller, put it into separate methods and call these from viewDidLoad and from the other parts in your code where you need them.
You can read more about the view controller life cycle in Apple's documentation.
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