私はそれを理解したと思います、私は同じ問題を抱えていました。最初に適切なアクセス許可で認証し、必要なアクセス許可 (publish_stream) を実際に受け入れるようにすれば、問題は解決するはずです。実際に「許可」ボタンを押すことができることを確認してください。現在のコードでは、認証後すぐにメッセージを投稿しようとしましたが、認証がまだ完了していないため、表示されません。その結果、有効な accessToken を持っていない可能性が高く、ウォールにメッセージを投稿できません。
// you perform authorization, but you don't wait for the user to accept the publish permission
[facebook authorize:@"MY_APP_ID" permissions:permissions delegate:self];
// you attempt to publish, but you don't have the permission to publish yet ...
NSMutableDictionary * params = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"MY_API_KEY", @"api_key", @"test", @"message", nil];
[facebook requestWithGraphPath:@"me/home" andParams:params andHttpMethod:@"POST" andDelegate:self];
この問題を解決するにはどうすればよいですか?
これは私が修正した方法です（DLog（）はNSLog（）のマクロであることに注意してください）：
/* The operationQueue array is used to keep track of operations that need to be
completed in order (e.g. if we aren't logged in when we want to post, first
log in, then post - this way we'll make sure we always have a valid
accessToken. */
- (id)initWithDelegate:(id <ServiceDelegate>)serviceDelegate
{
self = [super init];
if (self)
{
[self setDelegate:serviceDelegate];
userId = nil;
operationQueue = [[NSMutableArray alloc] init];
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
facebook = appDelegate.facebook;
}
return self;
}
- (id)init
{
return [self initWithDelegate:nil];
}
- (void)dealloc
{
[operationQueue release];
[super dealloc];
}
#pragma mark - Instance methods
- (void)login
{
if (![facebook isSessionValid]) {
SEL authorizationSelector = @selector(performAuthorization);
NSValue *selector = [NSValue valueWithPointer:authorizationSelector];
NSDictionary *dictionary = [NSDictionary dictionaryWithObject:selector forKey:@"selector"];
[operationQueue addObject:dictionary];
[self runOperations];
}
}
- (void)logout
{
SEL logoutSelector = @selector(performLogout);
NSValue *selector = [NSValue valueWithPointer:logoutSelector];
NSDictionary *dictionary = [NSDictionary dictionaryWithObject:selector forKey:@"selector"];
[operationQueue addObject:dictionary];
[self runOperations];
}
- (void)postMessage:(NSString *)message
{
NSArray *objects = [NSArray arrayWithObjects:message, nil];
NSArray *keys = [NSArray arrayWithObjects:@"message", nil];
NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjects:objects forKeys:keys];
NSDictionary *dictionary = [NSDictionary dictionaryWithObject:parameters forKey:@"parameters"];
SEL postMessageSelector = @selector(performPostMessageWithDictionary:);
NSValue *selector = [NSValue valueWithPointer:postMessageSelector];
NSDictionary *operationDictionary = [NSDictionary dictionaryWithObjectsAndKeys:selector, @"selector", dictionary, @"parameters", nil];
[operationQueue addObject:operationDictionary];
if (![facebook isSessionValid]) {
[self performSelectorOnMainThread:@selector(performAuthorization) withObject:nil waitUntilDone:NO];
} else {
[self runOperations];
}
}
#pragma mark - Private methods
- (void)runOperations
{
DLog(@"running operations ...");
for (NSDictionary *operationDictionary in operationQueue) {
NSValue *value = [operationDictionary objectForKey:@"selector"];
SEL selector = [value pointerValue];
NSDictionary *parameters = [operationDictionary objectForKey:@"parameters"];
[self performSelectorOnMainThread:selector withObject:parameters waitUntilDone:YES];
}
[operationQueue removeAllObjects];
}
- (void)performLogout {
[facebook logout:self];
}
- (void)performAuthorization {
NSArray *permissions = [NSArray arrayWithObject:@"publish_stream"];
[facebook authorize:permissions delegate:self];
}
- (void)performPostMessageWithDictionary:(NSDictionary *)dictionary {
NSMutableDictionary *parameters = [dictionary objectForKey:@"parameters"];
NSString *encodedToken = [facebook.accessToken stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *graphPath = [NSString stringWithFormat:@"me/feed?access_token=%@", encodedToken];
FBRequest *request = [facebook requestWithGraphPath:graphPath
andParams:parameters
andHttpMethod:@"POST"
andDelegate:self];
if (!request) {
DLog(@"error occured when trying to create FBRequest object with graph path : %@", graphPath);
}
}
/* make sure your interface conforms to the FBRequestDelegate protocol for
extra debug information, but this is not required */
#pragma mark - Facebook request delegate
- (void)requestLoading:(FBRequest *)request
{
DLog(@"requestLoading:");
}
- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response
{
DLog(@"request:didReceiveResponse:");
}
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error
{
DLog(@"error occured when trying to perform request to Facebook : %@", error);
}
- (void)request:(FBRequest *)request didLoad:(id)result
{
DLog(@"request:didLoad: %@", result);
}
- (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data
{
DLog(@"request:didLoadRawResponse");
}
/* make sure your interface conforms to the FBSessionDelegate protocol! */
#pragma mark - Facebook session delegate
/* if there are still operations in the queue that need to be completed,
continue executing the operations, otherwise inform out delegate that login
is completed ... */
- (void)fbDidLogin
{
if ([operationQueue count] > 0) {
[self runOperations];
}
if ([self.delegate respondsToSelector:@selector(serviceDidLogin:)])
{
[self.delegate serviceDidLogin:self];
}
}
- (void)fbDidNotLogin:(BOOL)cancelled
{
if ([self.delegate respondsToSelector:@selector(serviceLoginFailed:)])
{
[self.delegate serviceLoginFailed:self];
}
}
- (void)fbDidLogout
{
if ([self.delegate respondsToSelector:@selector(serviceDidLogout:)])
{
[self.delegate serviceDidLogout:self];
}
}