IOS miscellaneous-8 (Introduction to loadView, viewDidLoad, viewWillAppear, viewDidAppear, etc.), loadviewviewdidload

IOS miscellaneous-8 (Introduction to loadView, viewDidLoad, viewWillAppear, viewDidAppear, etc.), loadviewviewdidload

LoadView;
This is where subclasses shocould create their custom view hierarchy if they aren't using a nib. shocould never be called directly.
This is when they are not using the nib view page, the subclass will create its own custom view layer. It must not be called directly.

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ViewDidLoad;
Called after the view has been loaded. For view controllers created in code, this is after-loadView. For view controllers unarchived from a nib, this is after the view is set.
It is called after a view is loaded. If it is a view loader created in code, it will be called after the loadView method. If it is output from the nib view page, it will be called after the view is set.

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ViewWillAppear:

Called when the view is about to made visible. Default does nothing
Called when the view is about to be visible. No operations are performed by default.

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ViewDidAppear:
Called when the view has been fully transitioned onto the screen. Default does nothing
Called when the view has been fully transitioned to the screen

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ViewWillDisappear:
Called when the view is dismissed, covered or otherwise hidden. Default does nothing
A view is called when it is rejected. It is overwritten or hidden in other ways. No operations are performed by default.

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ViewDidDisappear:
Called after the view was dismissed, covered or otherwise hidden. Default does nothing
A view is called after it is rejected. It is overwritten or hidden in other ways. No operations are performed by default.