我想我想通了，我曾经有同样的问题。如果您首先使用正确的权限进行身份验证并确保您确实接受了所需的权限 (publish_stream)，则您的问题应该得到解决。确保您确实可以按下“允许”按钮。在您当前的代码中，您不会看到它，因为您在身份验证后立即尝试发布消息，但身份验证尚未完成。因此，您很可能没有有效的 accessToken，从而阻止您将消息发布到墙上。
// 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];
如何解决这个问题？
这是我修复它的方式（请注意 DLog() 是 NSLog() 的宏）：
/* 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];
}
}