无法恢复NSUserActivity的userInfo

Question

我有一个应用程序，你可以在我们学校找到员工通过电子邮件与他们联系。当您找到某人并查看详细信息时，将创建一个NSUserActivity：

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"9.0")) {
        //Create NSUserActivity for the person
        NSUserActivity * activity = [[NSUserActivity alloc] initWithActivityType:CAUserActivityTypePerson];
        activity.title = [_displayedPerson completeName];
        activity.requiredUserInfoKeys = [NSSet setWithArray:@[@"id", @"fullName"]];
        activity.userInfo = [NSDictionary dictionaryWithObjects:@[_displayedPerson.personID, [_displayedPerson completeName]] forKeys:@[@"id", @"fullName"]];


        activity.keywords = [NSSet setWithObjects:[_displayedPerson completeName], [_displayedPerson institutionString], nil];

        CSSearchableItemAttributeSet * contentAttributeSet = [[CSSearchableItemAttributeSet alloc] init];
        contentAttributeSet.contentDescription = [_displayedPerson institutionString];

        activity.contentAttributeSet = contentAttributeSet;

        //make the activity active and searchable
        self.userActivity = activity;
        self.userActivity.eligibleForHandoff = NO;
        self.userActivity.eligibleForSearch = YES;
        self.userActivity.eligibleForPublicIndexing = NO;
        self.userActivity.needsSave = YES;
        [self.userActivity becomeCurrent];
        NSLog(@"UserActivity created\nInfo: %@", self.userActivity.userInfo);
    } else
        NSLog(@"Did not create NSUserActivity! iOS 9 required!");

在创建UserActivity时，NSLog(@"UserActivity created\nInfo: %@", self.userActivity.userInfo);返回正确的userInfo。

当我在聚光灯下找到条目(正确显示所有相关数据)并单击它时，应用程序将被打开，- (BOOL)application:continueUserActivity:restorationHandler:被调用，userActivity包含正确的标题和类型。但是userInfo和requiredUserInfoKeys都是空的。

- (BOOL)application:(UIApplication *)application continueUserActivity:(NSUserActivity *)userActivity restorationHandler:(void (^)(NSArray * _Nullable))restorationHandler {

    NSLog(@"Activity: %@\nInfo: %@", userActivity.activityType, userActivity.requiredUserInfoKeys);

    return YES;
}

我不明白，在哪里我犯了一个错误。我已经读过this了，但没什么用。

PS：_displayedPerson.personID是一个NSNumber，[_displayedPerson completeName]返回一个NSString

Answer 1

我在苹果开发者论坛上找到了答案。updateUserActivityState:需要被覆盖。

- (void)updateUserActivityState:(NSUserActivity *)userActivity {
    [userActivity addUserInfoEntriesFromDictionary:@{@"id" : _displayedPerson.personID, @"fullName" : [_displayedPerson completeName]}];
}

我不知道，我为什么要这么做，但很管用。希望，这也会对其他人有所帮助。