I am having some main viewController , that i want to add a subview to it, as a child, which is also a viewController .

My approach is that when you finish editing that subview, he will tell the main view to do something with a delegate.

1. does this approach to create many subviews as viewcontrollers that being added to the main view, and notify him with delegate when something happens , is a good approach ?

2. why can't i add a delegate listener to my subview ? i created the protocol in my subview, and the main view is adding a subview and needs to subscribe to its delegate , so :

UIViewController *search = [[SearchView alloc]init]; //my subview that post delegate
    //[search delete:self]; //can't add delegate here,
    [self addChildViewController:search];
    // search.view.frame = CGRectMake(0, 0, 0, 550);
     [self.view addSubview:search.view];
    [search didMoveToParentViewController:self];

There is no delegate property in UIViewController but you call

[search delete:self];

On this object, not on SearchView object. If you added delegate property on SearchView you need to change the declaration to:

SearchView *search = [[SearchView alloc]init];

The other thing is if you added delegate in SearchView.h file like:

@property(assign) YOURDEL delegate; you should call:

[search setDelete:self];

instead of:

[search delete:self];