What is Delegation??

Many of the UIKit classes in iOS SDK use the Delegation design pattern. Delegation means that you designate one object to act on behalf of another object. A common example of this is the table view in UIKit. A table view will require an object to act as a delegate to do things like return the number of rows in a section, return a table cell and so on.

Delegation is a nice way to handle this situation. What I do is have the parent table view controller act as a delegate for the child editing view. When a user is done writing a note the editing view controller will send a message back to the parent table view controller. This gives me a chance to update the UI with the new note information.

You are going to need to do these things to use Delegation:

Define a protocol for ChildEditor.

Add a delegate property to ChildEditor that requires the protocol from step 1.

Add a NSIndexPath property to ChildEditor to remember what table view cell the string is displayed in.

When ChildEditor updates a string it must send a message to the delegate property from step 2

ParentTable must adopt the protocol from the step 1.

ParentTable must implement the delegate method that corresponds to the message that will be sent when ChildEditor updates a string (this is when the UI is updated).

Before a new ChildEditor is pushed onto the navigation controller set the delegate property to the ParentTable (you can use the self keyword here).

Before a new ChildEditor is pushed onto the navigation controller set the indexPath property to the property that you get in the didSelectRowAtIndexPath method.