What does override mean?
Swift version: 5.6
The override is used when you want to write your own method to replace an existing one in a parent class. It's used commonly when you're working with UIViewControllers, because view controllers already come with lots of methods like viewDidLoad() and viewWillAppear(). When you want to override these default methods, you need to specify this with the override keyword.
Now, you might be wondering why the override keyword is even needed, but it's really about ensuring your code is safe – if you write a method and accidentally name it the same as something that already exists, Xcode will simply refuse to build your app until you add in the override keyword. Similarly, if you use override on a method that doesn't override something that already exists, Xcode will refuse to build.
SPONSORED From March 20th to 26th, you can join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 7.0
Similar solutions…
- How to override animations with transactions
- What does weak mean?
- What does the message "Simulator user has requested new graphics quality: 100" mean?
- What does an exclamation mark mean?
- What does unowned mean?
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
