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    <p>a good practice when making a singleton class is to use shared instance. Correct singleton also has to include some memory management overridden methods. In your case it can be done like this:</p> <pre><code>@implementation FacebookManager static FacebookManager *mySharedFacebookManager; + (FacebookManager*)sharedFacebookManager { @synchronized(self) { if(mySharedFacebookManager == nil) { mySharedFacebookManager = [[self alloc] init]; } } return mySharedFacebookManager; } + (id)allocWithZone:(NSZone *)zone { @synchronized(self) { if(mySharedFacebookManager == nil) { mySharedFacebookManager = [super allocWithZone:zone]; return mySharedFacebookManager; } } return nil; } - (id)copyWithZone:(NSZone *)zone { return self; } - (id)retain { return self; } - (unsigned)retainCount { return UINT_MAX; } - (oneway void)release { } - (id)autorelease { return self; } </code></pre> <p>In your case you may have Facebook type object as ivar, and some methods to wrap over FB API, for example like this:</p> <pre><code>- (id)init { self = [super init]; if(self) { facebook = [[Facebook alloc] initWithAppId:FB_APP_ID andDelegate:self]; // restore previous session NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; if ([defaults objectForKey:@"FBAccessTokenKey"] &amp;&amp; [defaults objectForKey:@"FBExpirationDateKey"]) { facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"]; facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"]; } ... } return self; } - (void)login { NSArray *permissions = [NSArray arrayWithObjects: @"user_about_me", @"publish_stream", nil]; [facebook authorize:permissions]; } - (void)postToFeed:(NSString*)messageToPost { NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys: messageToPost, @"message", nil]; [facebook requestWithGraphPath:@"me/feed" andParams:params andHttpMethod:@"POST" andDelegate:self]; } </code></pre> <p>From other classes which have to deal with Facebook the construction is simple:</p> <pre><code>[[FacebookManager sharedFacebookManager] login]; ... [[FacebookManager sharedFacebookManager] postToFeed:@"Hello World!"]; </code></pre> <p>I hope this snippets will help you.</p> <p>To manage your facebook session you have to remember accessToken manually in FBSessionDelegate methods like that:</p> <pre><code>- (void)fbDidLogin { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"]; [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"]; [defaults synchronize]; } - (void)fbDidLogout { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults removeObjectForKey:@"FBAccessTokenKey"]; [defaults removeObjectForKey:@"FBExpirationDateKey"]; [defaults synchronize]; } </code></pre>
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    1. POFacebook IOS SDK trying to make singleton class?
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    1. USArtur Ozierański
    1. USArtur Ozierański
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      1. VTUpMod
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    1. COYes is a good idea with memory management, i will do this, but my main problem is that if i use check if the user is logged in already, using safari or Facebook application, the session remains invalid (facebook isSessionValid) and i can't post message ore anything else.
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      1. USMihai Georgescu
    2. CO@MykeAndreas Now I understand. I completed the code above with FBSessionDelegate methods and modification in init method. Hope now it will works for you.
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      1. USArtur Ozierański
    3. COYes but didlogin and didlogout aren't called because you don't use the application to login or logout, you just check if you are logged in and if not you use FBApplication to log in or Safari, this is if you set WithFBAppAuth:YES safariAuth:YES from facebook.m !
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      1. USMihai Georgescu
 

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