IOS Study Notes 7-uiviewcontroller

Uiviewcontroller inherits uiresponder, while uiresponder inherits nsobject. uiviewcontroller is the parent class of all view controllers.

In MVC mode, uiviewcontroller plays the role of C (Controller) to control views and model operations.

If a project is created or a viewcontroller is associated. initialize the XIB file in the viewdidload method. XIB view, you need to create a view controller from loadview.

Simple Life Cycle of viewcontroller:

Loadview: Create a View Controller (if not loaded from. XIB)

Viewdidload: View loaded

Viewwillappear: Run view before loading

Viewwilldisappear: run the view before it disappears (disabled or overwritten)

Willrotatetointerfaceorientation: Duration: Run when rotation starts

Didrotatetointerfaceorientation: Run when rotation ends

Differences between loadview and viewdidload:

Loadview is called when the view is initialized. It is called only once after the application is enabled.

Viewdidload is called every time you enter a view.

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