Using Facebook Graph API on iOS - ios

Question

This is my first post on StackOverflow but i use this for a long time...
My problem is basically simple, I want to share the content of a UITextView(mShareText) on the user's wall without prompting any Dialog. Basically, the user has to fill its message on the UITextView and then click on a "post" UIButton. Simple isn't it ?
I've downloaded the Facebook iOS SDK and copied it into my project. I've included "FBConnect.h" and "Facebook.h" on my controller's header file and created a var : Facebook* facebook;, the controller also implements the following delegates : FBSessionDelegate, FBRequestDelegate.
On my controller's implementation file, I've a IBAction triggered when the user clicks on the "post" UIButton.
- (IBAction)onShareByFBPressed:(id)sender {
NSLog(#"onShareByFBPressed");
// Facebook settings
NSMutableDictionary* params = [[NSMutableDictionary alloc] initWithCapacity:3];
[params setObject:mShareText.text forKey:#"message"];
[params setObject:#"http://www.example.com" forKey:#"link"];
[params setObject:#"https://www.example.com/myImg.jpg" forKey:#"picture"];
[facebook requestWithGraphPath:#"me/feed"
andParams:params
andHttpMethod:#"POST"
andDelegate:self];
[params release];
}
I've implemented this on my viewdidload:
- (void)viewDidLoad
{
NSLog(#"viewDidLoad");
[super viewDidLoad];
(...)
// Test facebook
facebook = [[Facebook alloc] initWithAppId:#"XXXXXXXXXXX" andDelegate:self];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:#"FBAccessTokenKey"] && [defaults objectForKey:#"FBExpirationDateKey"]) {
facebook.accessToken = [defaults objectForKey:#"FBAccessTokenKey"];
facebook.expirationDate = [defaults objectForKey:#"FBExpirationDateKey"];
NSLog(#"AccessToken: %# ExpirationDate: %#", facebook.accessToken, facebook.expirationDate);
}else{
NSLog(#"No AccessToken or ExpirationDate");
}
if (![facebook isSessionValid]) {
[facebook authorize:[NSArray arrayWithObjects:#"publish_stream", nil]];
}
}
Here are different methods I had to implement due to the delegates :
// Pre 4.2 support
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
return [facebook handleOpenURL:url];
}
// For 4.2+ support
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
return [facebook handleOpenURL:url];
}
- (void)fbDidLogin {
NSLog(#"fbDidLogin");
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[facebook accessToken] forKey:#"FBAccessTokenKey"];
[defaults setObject:[facebook expirationDate] forKey:#"FBExpirationDateKey"];
[defaults synchronize];
}
- (void)fbSessionInvalidated{
NSLog(#"fbSessionInvalidated");
}
- (void)fbDidLogout{
NSLog(#"fbDidLogout");
}
- (void)fbDidExtendToken:(NSString*)accessToken expiresAt:(NSDate*)expiresAt{
NSLog(#"fbDidExtendToken");
}
- (void)fbDidNotLogin:(BOOL)cancelled{
NSLog(#"fbDidNotLogin");
}
- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response{
NSLog(#"didReceiveResponse: %#", response);
}
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error{
NSLog(#"didFailWithError: %#", [error description]);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Share on Facebook"
message:#"An error occured"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
Unfortunatelly, everytime I try to trigger my "onShareByFBPressed" method, I got the following error on the log:
2012-02-17 13:02:06.401 Mixtapes[935:707] didFailWithError: Error Domain=facebookErrDomain Code=10000 "The operation couldn’t be completed. (facebookErrDomain error 10000.)" UserInfo=0x1f6f60 {error=<CFBasicHash 0x1f6660 [0x3ec6d630]>{type = mutable dict, count = 3,
entries =>
2 : <CFString 0x1f64a0 [0x3ec6d630]>{contents = "type"} = <CFString 0x1f6b10 [0x3ec6d630]>{contents = "OAuthException"}
3 : <CFString 0x1f6ab0 [0x3ec6d630]>{contents = "message"} = <CFString 0x1f6a10 [0x3ec6d630]>{contents = "An active access token must be used to query information about the current user."}
6 : <CFString 0x1f6e60 [0x3ec6d630]>{contents = "code"} = 2500
}
}
Can anyone tell me what's wrong with my implementation ??
Thanks a lot.
Best regards.
EDIT:
#Adil
Thanks for your proposal. It actually works somethimes.
Sometimes i got the following error :
didFailWithError: Error Domain=facebookErrDomain Code=10000 "The operation couldn’t be completed. (facebookErrDomain error 10000.)" UserInfo=0xa17e0d0 {error=<CFBasicHash 0xa171e10 [0x3ec6d630]>{type = mutable dict, count = 3,
entries =>
2 : <CFString 0xa179d10 [0x3ec6d630]>{contents = "type"} = <CFString 0xa17a280 [0x3ec6d630]>{contents = "OAuthException"}
3 : <CFString 0x6127710 [0x3ec6d630]>{contents = "message"} = <CFString 0xa178db0 [0x3ec6d630]>{contents = "Error validating access token: Session is invalid. This could be because the application was uninstalled after the session was created."}
6 : <CFString 0xa17e020 [0x3ec6d630]>{contents = "code"} = 190
}
}
Thanks for your help

Answer 1

The problem here is:
The facebook which is authororized is AppDelegate's facebook object, not your ViewController's facebook.
Solution:
Instead allocating new Facebook object for every ViewController or where you needed.
you should make a property of your application delegate. like this:
in appDelegate.h
#property(nonatomic, retain) Facebook *facebook;
and synthesize it in appDelegate.m and now put initialization of Facebook in
- (BOOL)application:(UIApplication *)ap didFinishLaunchingWithOptions:(NSDictionary *)op
{
// other code....
facebook = [[Facebook alloc] initWithAppId:#"XXXXXXXXXXX" andDelegate:self];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:#"FBAccessTokenKey"] && [defaults objectForKey:#"FBExpirationDateKey"]) {
facebook.accessToken = [defaults objectForKey:#"FBAccessTokenKey"];
facebook.expirationDate = [defaults objectForKey:#"FBExpirationDateKey"];
NSLog(#"AccessToken: %# ExpirationDate: %#", facebook.accessToken, facebook.expirationDate);
}else{
NSLog(#"No AccessToken or ExpirationDate");
}
return true;
}
now where do you want to use it, write something like this:
- (void)viewDidLoad
{
[super viewDidLoad];
//...
AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
facebook = app.facebook;
if (![facebook isSessionValid]) {
[facebook authorize:[NSArray arrayWithObjects:#"publish_stream", nil]];
}
}

Answer 2

Try to deauthorize your application and then authorize it again