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    <p>I don't understand your problem using delegates with a singleton pattern based class.</p> <p>You create a NSMutableArray to store the observers and notify all in a loop if something happened.</p> <pre><code>- (void)addObserver(id&lt;locationControllerDelegate&gt; observer) { [observers addObject: observer]; } - (void)notifyAll() { for (id&lt;locationControllerDelegate&gt; observer in observers) { [observer someMethod]; } } </code></pre> <p>Don't forget to add a removeObserver() Method.</p> <p>Than you can simply add the delegates via</p> <pre><code>[[MyClass sharedInstance] addObserver:self]; </code></pre> <p>In your case</p> <pre><code>[[LocationController locationmanager] addObserver:self]; </code></pre> <h1>Basic Example</h1> <p>So here a very basic (no memory management) code example, of how singleton works.</p> <p>Protocol: DelegateProtocol.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @protocol DelegateProtocol &lt;NSObject&gt; - (void)someMethod; @end </code></pre> <p>Singelton class:</p> <p>MySingelton.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @protocol DelegateProtocol; @interface MySingleton : NSObject{ NSMutableArray *observers; } + (MySingleton *)sharedInstance; - (void)addObserver:(id&lt;DelegateProtocol&gt;) observer; - (void)notifyAll; @end </code></pre> <p>MySingleton.m</p> <pre><code>#import "MySingleton.h" #import "DelegateProtocol.h" @implementation MySingleton static MySingleton *sharedInstance; - (id)init { self = [super init]; if (self) { observers = [[NSMutableArray alloc] init]; } return self; } + (MySingleton *)sharedInstance { if (sharedInstance == NULL) { sharedInstance = [[MySingleton alloc] init]; } return sharedInstance; } - (void)addObserver:(id&lt;DelegateProtocol&gt;)observer { [observers addObject:observer]; } - (void)notifyAll { for(id&lt;DelegateProtocol&gt; observer in observers) { [observer someMethod]; } } @end </code></pre> <p>And finally the class using the sharedInstance.</p> <p>SomeClass.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "DelegateProtocol.h" @interface SomeClass : NSObject &lt;DelegateProtocol&gt; @end </code></pre> <p>SomeClass.m</p> <pre><code>#import "SomeClass.h" #import "DelegateProtocol.h" #import "MySingleton.h" @implementation SomeClass - (id)init { self = [super init]; if (self) { } return self; } - (void)someMethod { NSLog(@"Called from singleton!"); } @end </code></pre> <p>And a main method that will use all this stuff:</p> <p>main.m</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "SomeClass.h" #import "MySingleton.h" int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; SomeClass *aClass = [[SomeClass alloc]init]; [[MySingleton sharedInstance] addObserver:aClass]; [[MySingleton sharedInstance] notifyAll]; [pool drain]; return 0; } </code></pre> <p>You will see that the someMethod-Method will be called on notifyAll.</p>
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    1. COok let me explain a little bit more by editing my question
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    2. COyou mean to say i would add like this ? "[[LocationController locationManager] addObserver: forKeyPath: options: context:]" where i will be listening the delegates or where ?
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    3. COThank you very much for time and effort you put to reply me back. i am very grateful for this
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