アプリに Facebook ログインを実装しようとしています。次の 2 つのガイドに従って手紙を書きました。
http://developers.facebook.com/docs/getting-started/facebook-sdk-for-ios/ https://developers.facebook.com/docs/howtos/login-with-facebook-using-ios-sdk/
しかし、iPhone エミュレーター用にアプリをコンパイルしようとすると、リンカー エラーが発生します。
Undefined symbols for architecture i386:
"_FBSessionStateChangedNotification", referenced from:
-[AppDelegate sessionStateChanged:state:error:] in AppDelegate.o
-[LoginViewController viewDidLoad] in LoginViewController.o
-[AppDelegate sessionStateChanged:state:error:] in AppDelegate.o
-[LoginViewController viewDidLoad] in LoginViewController.o
ld: symbol(s) not found for architecture i386
必要なフレームワークとファイルがすべて適切な場所にあることを確認しました。また、Xcode でコード エラーが発生しないため、ここで何が問題なのか本当にわかりません。
どうぞ、どんな助けでも大歓迎です。
編集：
//AppDelegate.h
#import <UIKit/UIKit.h>
#import <FacebookSDK/FacebookSDK.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate> {
}
@property (strong, nonatomic) UIWindow *window;
extern NSString *const FBSessionStateChangedNotification;
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI;
- (void)closeSession;
@end
-
// AppDelegate.m
#import "AppDelegate.h"
#import "NetworkCheck.h"
@implementation AppDelegate
- (void)dealloc
{
[_window release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
NSLog(@"Application launch");
NetworkCheck *netCheck = [[NetworkCheck alloc] init];
[netCheck startCheck];
NSString *const FBSessionStateChangedNotification = @"com.example.Login:FBSessionStateChangedNotification";
return YES;
}
/*
* If we have a valid session at the time of openURL call, we handle
* Facebook transitions by passing the url argument to handleOpenURL
*/
- (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];
}
/*
* Callback for session changes.
*/
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
if (!error) {
// We have a valid session
NSLog(@"User session found");
}
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:[FBSession.activeSession closeAndClearTokenInformation];
break;
default:
break;
}
[[NSNotificationCenter defaultCenter]
postNotificationName:FBSessionStateChangedNotification
object:session];
if (error) {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:@"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alertView show];
}
}
/*
* Opens a Facebook session and optionally shows the login UX.
*/
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
return [FBSession openActiveSessionWithReadPermissions:nil
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
[self sessionStateChanged:session
state:state
error:error];
}];
}
- (void) closeSession {
[FBSession.activeSession closeAndClearTokenInformation];
}
- (void)applicationWillResignActive:(UIApplication *)application
{
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
- (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.
// We need to properly handle activation of the application with regards to Facebook Login
// (e.g., returning from iOS 6.0 Login Dialog or from fast app switching).
[FBSession.activeSession handleDidBecomeActive];
}
- (void)applicationWillTerminate:(UIApplication *)application
{
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
[FBSession.activeSession close];
}
@end