Explain the use of below function with meaning in iphone

I m confused to use following methods and i want the cl开发者_如何学JAVAear meaning of all so that i can use that perfectly in my project

1. -(void)viewWillAppear
2. -(void)viewWillDisappear
3. -(void)viewDidLoad
4. -(void)viewDidUnload
5. -(void)viewDidAppear
6. -(void)viewDidDisappear

Please can any body who knows these very well then please help me.

Thanks in Advance

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Have you looked at the iPhone Developer Documentation for UIViewController? It explains it well I think.

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This is from the top of my head. Here is some more info: Custom View Controllers

-(void)viewWillAppear
Fired just before the uiview appears on the screen.

-(void)viewWillDisappear
Fired just before the uiview disappears from the screen.

-(void)viewDidLoad
Fired after the uview loaded into memory and after the IBOutlets are hooked up (if any)

-(void)viewDidUnload
Fired after the uview unloaded from memory.

-(void)viewDidAppear
Fired after the view appeared on the screen.

-(void)viewDidDisappear
Fired after view disappeared from the screen.