How do I pass data between view controllers?

Passing data between view controllers is a common requirement in iOS app development, allowing different view controllers to communicate and share information. There are several methods to pass data between view controllers in iOS:

• Using Properties: Define properties in the destination view controller to hold the data to be passed. Set these properties with the desired data before presenting or pushing the destination view controller.
• Using Initializers: Implement custom initializers for view controllers to accept data as parameters. Initialize the destination view controller with the necessary data when creating an instance of it.
• Using Segues: If using segues to transition between view controllers, override the prepare(for:sender:) method in the source view controller. Access the destination view controller through the segue’s destination property and pass data to it before the segue is performed.
• Using Delegates: Define a protocol and delegate relationship between the source and destination view controllers. Implement the protocol in the source view controller and set the destination view controller as the delegate. Call delegate methods to pass data from the source to the destination view controller.
• Using Notifications: Post notifications with the desired data from the source view controller. Add observers in the destination view controller to listen for these notifications and handle the received data accordingly.
• Using Singletons: Store shared data in a singleton object accessible from both the source and destination view controllers. Access the singleton object to read or modify the shared data as needed.
• Using User Defaults: Store small amounts of data persistently using UserDefaults. Write data to UserDefaults in the source view controller and read it from UserDefaults in the destination view controller.

The method chosen to pass data between view controllers depends on factors such as the relationship between the view controllers, the amount and complexity of the data being passed, and personal preference. It’s essential to choose an appropriate method that meets the specific requirements of your iOS app and ensures efficient and maintainable data communication between view controllers.