When is viewdidload called

Improve this answer. Jordan Jordan I think your last sentence there has answered my question. That's good to know! Atal Singh Atal Singh 69 5 5 bronze badges. Aaron Saunders Aaron Saunders Just to be clear, viewDidLoad won't be called multiple times consecutively. That makes sense.

In other words, viewDidUnload is always called before another call of viewDidLoad , correct? Aks Aks 4, 1 1 gold badge 34 34 silver badges 32 32 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Now that you have an understanding of the view life cycle, let's demonstrate it in a more practical manner: By changing the color of the view's background color.

You can already do that manually in the view's Attributes Inspector, but wouldn't it be more fun to set the background to a random color every time you launch the app? Of course it would be! Go ahead and try it! Try it out. You won't see the random color "pop" in anymore. Mission accomplished, right? In this simple app, that only occurs once, but in a more complicated app with multiple screens, it would mean the user would see a new color every time they navigated back to this screen.

That may be what you want, but you can also consider putting the code that sets the background color in viewDidLoad.

This will change the background color once, when the view is loaded. Try putting the code there. Your complete implementation of ViewController will look like this:. One thing to note before ending the lesson: The line of code that changed the background color referenced a variable called view.

You'll learn more about this in later lessons, but it's important to note that the variable view is not random or magical; it's just an instance variable. View View LifeCycle on Learn. Swift Viewlifecycle Readme Keep away from people who try to belittle your ambitions. Learning Objectives Connect the View Controller to a. But before we get started writing code, let's talk about how your application creates views. That was a lot to digest at once, so let's take it piece by piece.

How does that view get associated with a view controller? Bring up the view controller's Identity Inspector. Right now, ViewController. You should see output like this: Putting It Together Now that you have an understanding of the view life cycle, let's demonstrate it in a more practical manner: By changing the color of the view's background color.

At least as far I know. Ultimately pickling the configs I use to build the graph and making that dag-config building a scheduled dag that then triggers my actual dag with that schedule set to None command was what I did. How often is viewDidLoad called? Asked 3 Months ago Answers: 5 Viewed 7 times. Don't do view controller initialisation in viewDidLoad.

This is a common mistake. Matt Bullock. It depends on the memory usage and the heap in which the objects are stored. It only depends on the new memory requirements and available memory.

Edit: This has been corrected. Viewed 14k times. Improve this question. An easy way to get a better understanding is to add nslog statements in a view controller and take a look at the output. Just go through this: stackoverflow. Add a comment. Active Oldest Votes. Improve this answer. Rahul Sharma Rahul Sharma 1 1 silver badge 17 17 bronze badges. TL;DR - cool analogy tho ; — Sentry.

Really like the answer — Usman Khan.