我正在为 ios 使用 facebook sdk 3.0.8。当我尝试使用 facebook 登录时，它工作正常，但有时当我在注销后尝试登录时，应用程序崩溃了。
这是异常消息
*** Assertion failure in -[FBSession close], /Users/jacl/src/ship/ios-sdk/src/FBSession.m:342
你能告诉我我哪里出错了吗？
这是 AppDelegate 中的代码
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
// attempt to extract a token from the url
return [FBSession.activeSession handleOpenURL:url];
}
- (void)applicationWillTerminate:(UIApplication *)application {
[self.session close];
}
#pragma mark Template generated code
// FBSample logic
// It is possible for the user to switch back to your application, from the native Facebook application,
// when the user is part-way through a login; You can check for the FBSessionStateCreatedOpenening
// state in applicationDidBecomeActive, to identify this situation and close the session; a more sophisticated
// application may choose to notify the user that they switched away from the Facebook application without
// completely logging in
- (void)applicationDidBecomeActive:(UIApplication *)application {
/*
Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
*/
// FBSample logic
// this means the user switched back to this app without completing a login in Safari/Facebook App
if (self.session.state == FBSessionStateCreatedOpening) {
// BUG: for the iOS 6 preview we comment this line out to compensate for a race-condition in our
// state transition handling for integrated Facebook Login; production code should close a
// session in the opening state on transition back to the application; this line will again be
// active in the next production rev
//[self.session close]; // so we close our session and start over
}
}
View Controller 内的代码
-(IBAction)connectWithFacebook{
DemoAppDelegate *appDelegate = (TotallyCuteAppDelegate *) [[UIApplication sharedApplication]delegate];
if (!appDelegate.session.isOpen && (appDelegate.session.state != FBSessionStateCreated))
{
appDelegate.session = [[FBSession alloc] init];
}
NSArray *permissions = [[NSArray alloc] initWithObjects:
@"publish_actions",
@"email",
nil];
//app crashes here
[FBSession openActiveSessionWithPermissions:permissions allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
if (session.isOpen)
{
NSLog(@"LoginVC->Session is open");
appDelegate.session=session;
[userDefaults setObject:appDelegate.session.accessToken forKey:@"facebook_token"];
[userDefaults setObject:paramFBId forKey:@"facebook_id"];
}
else
{
NSLog(@"LoginVC->Session is not open");
}
}//end completionHandler
];
}
-(IBAction)logout:(id)sender{
DemoAppDelegate *appDelegate = (TotallyCuteAppDelegate *) [[UIApplication sharedApplication]delegate];
if (appDelegate.session.isOpen) {
[appDelegate.session closeAndClearTokenInformation];
[[NSUserDefaults userDefaults] removeObjectForKey:@"facebook_id"];
[[NSUserDefaults userDefaults] removeObjectForKey:@"facebook_token"];
}
}
编辑:
删除了以下代码，现在它工作正常
if (!appDelegate.session.isOpen && (appDelegate.session.state != FBSessionStateCreated))
{
appDelegate.session = [[FBSession alloc] init];
}
这是更新的代码
-(IBAction)connectWithFacebook{
if ([InternetChecker isConnected])
{
DemoAppDelegate *appDelegate = (TotallyCuteAppDelegate *) [[UIApplication sharedApplication]delegate];
/* Removed following if block
if (!appDelegate.session.isOpen && (appDelegate.session.state != FBSessionStateCreated))
{
appDelegate.session = [[FBSession alloc] init];
}
*/
NSArray *permissions = [[NSArray alloc] initWithObjects:
@"publish_actions",
@"email",
nil];
[FBSession openActiveSessionWithPermissions:permissions allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
if (session.isOpen)
{
NSLog(@"LoginVC->Session is open");
appDelegate.session=session;
[userDefaults setObject:appDelegate.session.accessToken forKey:@"facebook_token"];
[userDefaults setObject:paramFBId forKey:@"facebook_id"];
}
else
{
NSLog(@"LoginVC->Session is not open);
}
}//end completionHandler
];
}
}
最佳答案
查看FBSession.m，close中的断言如下:
NSAssert(self.affinitizedThread == [NSThread currentThread], @"FBSession: should only be used from a single thread");
您是从创建 session 的线程以外的线程调用
-close 吗？进一步研究这一点。您正在滥用 API。你正在创造
appDelegate.session = [[FBSession alloc] init];
但后来你打电话
[FBSession openActiveSessionWithPermissions ...
这将创建一个全新的 session 。这意味着您从未打开
appDelegate.session ，因此您不应该尝试关闭它。你应该做的是以下内容:[FBSession openActiveSessionWithPermissions ...
appDelegate.session = [FBSession activeSession];
另一种选择是这样做:
appDelegate.session = [[FBSession alloc] init];
[appDelegate.session openWithCompletionHandler: ...
关于ios - Facebook iOS SDK，针对 FBSession 的异常，*** 断言失败 -[FBSession close]，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13228372/