我试图让用户发布一个简单的 Facebook 状态更新，而不使用 OpenGraph。到目前为止，允许用户登录并请求publish_actions权限，一切顺利。
但是，当我尝试调用presentShareDialogWithLink:name:caption:description:picture:clientState:handler:它时，它总是返回 nil 并且什么也不显示。它甚至似乎都没有调用处理程序，这使得它不知道为什么它不起作用。
这可能失败的原因是什么？如果我知道可能是什么原因，我总是可以追溯我的脚步。
相关代码
用户按下按钮
AppDelegate_Pad *appDelegate = (AppDelegate_Pad *)[[UIApplication sharedApplication] delegate];
if(FBSession.activeSession.isOpen) {
[appDelegate postFacebookUpdateWithAlbum:album];
} else {
// The person using the app has initiated a login, so call the openSession method
// and show the login UX if necessary.
[appDelegate openSessionWithAllowLoginUI:YES album:album];
}
App Delegate 中的 Facebook 代码
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
if ([FBSession.activeSession handleOpenURL:url]) {
[self postFacebookUpdateWithAlbum:self.facebookAlbum];
self.facebookAlbum = nil;
return YES;
}
}
#pragma mark Facebook
/*
* Opens a Facebook session and optionally shows the login UX.
*/
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI album:(LPAlbum *)album {
self.facebookAlbum = album;
return [FBSession openActiveSessionWithPublishPermissions:@[@"publish_actions"] defaultAudience:FBSessionDefaultAudienceFriends allowLoginUI:allowLoginUI completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
[self sessionStateChanged:session
state:status
error:error];
}];
}
- (void)postFacebookUpdateWithAlbum:(LPAlbum *)album {
if (album) {
// we defer request for permission to post to the moment of post, then we check for the permission
if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound) {
// if we don't already have the permission, then we request it now
[FBSession.activeSession requestNewPublishPermissions:@[@"publish_actions"]
defaultAudience:FBSessionDefaultAudienceFriends
completionHandler:^(FBSession *session, NSError *error) {
if (!error) {
[self doPostWithAlbum:album];
}
else {
DLog(@"Could not get permissions. Error: %@", error);
}
}];
} else {
[self doPostWithAlbum:album];
}
}
}
- (void)doPostWithAlbum:(LPAlbum *)album {
NSString *initialText = [NSString stringWithFormat:@"Neat status update"];
NSURL *coverImageURL = [NSURL URLWithString:album.imageBaseURLString];
UIImage *coverImage = [UIImage imageWithContentsOfFile:album.imageBaseURLString];
NSURL *infoLinkURL = [NSURL URLWithString:album.infoSiteURLString];
// First, try the iOS 6 native sharing.
BOOL iOS6native = [FBDialogs presentOSIntegratedShareDialogModallyFrom:self.window.rootViewController initialText:initialText image:coverImage url:infoLinkURL handler:^(FBOSIntegratedShareDialogResult result, NSError *error) {
}];
if (!iOS6native) {
NSString *name = @"name";
NSString *caption = @"caption";
NSString *description = @"description";
FBShareDialogParams *params = [[FBShareDialogParams alloc] init];
params.link = infoLinkURL;
params.name = name;
params.description = description;
BOOL canPresent = [FBDialogs canPresentShareDialogWithParams:params]; // returns NO
DLog(@"Can present with params? %@", canPresent ? @"Yes" : @"No");
canPresent = [FBDialogs canPresentOSIntegratedShareDialogWithSession:[FBSession activeSession]]; // returns NO
DLog(@"Can present with session? %@", canPresent ? @"Yes" : @"No");
FBAppCall *appCall = [FBDialogs presentShareDialogWithLink:infoLinkURL
name:name
caption:caption
description:description
picture:coverImageURL
clientState:nil
handler:^(FBAppCall *call, NSDictionary *results, NSError *error) {
if (error) {
DLog(@"Error: %@", error.description);
} else {
DLog(@"Success!");
}
}];
if (!appCall) {
// App call failed.
}
}
}
// Convenience method to perform some action that requires the "publish_actions" permissions.
- (void) performPublishAction:(void (^)(void)) action {
// we defer request for permission to post to the moment of post, then we check for the permission
if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound) {
// if we don't already have the permission, then we request it now
[FBSession.activeSession requestNewPublishPermissions:@[@"publish_actions"]
defaultAudience:FBSessionDefaultAudienceFriends
completionHandler:^(FBSession *session, NSError *error) {
if (!error) {
action();
}
//For this example, ignore errors (such as if user cancels).
}];
} else {
action();
}
}