在iOS上使用Facebook Graph API

Question

這是我在StackOverflow上的第一篇文章，但我用了很長時間......

我的問題基本上很簡單，我想在用戶的牆上分享UITextView(mShareText)的內容而不提示任何Dialog。 基本上，用戶必須在UITextView上填寫其消息，然后單擊“ post ”UIButton。 簡單不是嗎？

我已下載Facebook iOS SDK並將其復制到我的項目中。 我在控制器的頭文件中包含了“ FBConnect.h ”和“ Facebook.h ”並創建了一個var： Facebook* facebook ;控制器還實現了以下代理：FBSessionDelegate，FBRequestDelegate。

在我的控制器的實現文件中，當用戶點擊“post”UIButton時，我觸發了IBAction。

- (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];
}

我在我的viewdidload上實現了這個：

- (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]];
    }
}

以下是由於代表我必須實現的不同方法：

// 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];
}

不幸的是，每當我嘗試觸發我的“onShareByFBPressed”方法時，我在日志中收到以下錯誤：

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
}
}

誰能告訴我我的實施有什么問題？

非常感謝。

最好的祝福。

編輯：@Adil

謝謝你的提議。 它實際上工作了一些時間。

有時我得到以下錯誤：

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
}
}

謝謝你的幫助

Answer 1

這里的問題是：

被授權的facebook是AppDelegate的facebook對象，而不是ViewController的facebook。

解：

而是為每個ViewController或您需要的地方分配新的Facebook對象。 您應該創建應用程序delegate的屬性。 像這樣：

在appDelegate.h中

@property(nonatomic, retain) Facebook *facebook;

並在appDelegate.m中合成它，現在將Facebook初始化

- (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;
}

現在你想在哪里使用它，寫下這樣的東西：

- (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

嘗試取消對您的應用程序的授權，然后再次授權