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copied!<p>This below code just show the very basic use of delegate concept .. you name the variable and class as per your requirement.</p> <p>First you need to declare a protocol:</p> <p>Let's call it <strong>MyFirstControllerDelegate.h</strong> </p> <pre><code>@protocol MyFirstControllerDelegate - (void) FunctionOne: (MyDataOne*) dataOne; - (void) FunctionTwo: (MyDatatwo*) dataTwo; @end </code></pre> <p>Import <strong>MyFirstControllerDelegate.h</strong> file and confirm your <strong>FirstController</strong> with protocol <strong>MyFirstControllerDelegate</strong></p> <pre><code>#import "MyFirstControllerDelegate.h" @interface FirstController : UIViewController<MyFirstControllerDelegate> { } @end </code></pre> <p>In the implementation file, you need to implement both functions of protocol:</p> <pre><code>@implementation FirstController - (void) FunctionOne: (MyDataOne*) dataOne { //Put your finction code here } - (void) FunctionTwo: (MyDatatwo*) dataTwo { //Put your finction code here } //Call below function from your code -(void) CreateSecondController { SecondController *mySecondController = [SecondController alloc] initWithSomeData:.]; //..... push second controller into navigation stack mySecondController.delegate = self ; [mySecondController release]; } @end </code></pre> <p>in your <strong>SecondController</strong>:</p> <pre><code>@interface SecondController:<UIViewController> { id <MyFirstControllerDelegate> delegate; } @property (nonatomic,assign) id <MyFirstControllerDelegate> delegate; @end </code></pre> <p>In the implementation file of <strong>SecondController</strong>.</p> <pre><code>@implementation SecondController @synthesize delegate; //Call below two function on self. -(void) SendOneDataToFirstController { [delegate FunctionOne:myDataOne]; } -(void) SendSecondDataToFirstController { [delegate FunctionTwo:myDataSecond]; } @end </code></pre> <p><a href="http://en.wikipedia.org/wiki/Delegation_pattern#Objective-C_example" rel="noreferrer">Here</a> is the wiki article on delegate. </p>

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