问题
How do I use CKFetchNotificationChangesOperation to handle and direct all missed notifications from a subscribed CKSubscription to the - (void)application:(nonnull NSApplication *)application didReceiveRemoteNotification:(nonnull NSDictionary *)userInfo { in my Mac application? The code I have for that method is as follows,
- (void)application:(nonnull NSApplication *)application didReceiveRemoteNotification:(nonnull NSDictionary *)userInfo {
NSLog(@"CKSubscription received.");
CKQueryNotification *cloudKitNotification = [CKQueryNotification notificationFromRemoteNotificationDictionary:userInfo];
[[NSNotificationCenter defaultCenter] postNotificationName:@"CloudKitUpdated" object:nil userInfo:@{@"ckNotification" : cloudKitNotification}];
}
My app is a menulet and I want it to check for any missed notifications and handle them properly when the menulet is clicked on.
UPDATE: This is the code I have been trying but the array is always empty and there is no error. I am testing by running the app, closing the app, deleting a record, and then running the app again.
NSMutableArray *array = [NSMutableArray array];
CKFetchNotificationChangesOperation *operation = [[CKFetchNotificationChangesOperation alloc] initWithPreviousServerChangeToken:nil];
operation.notificationChangedBlock = ^(CKNotification *notification) {
[array addObject:notification.notificationID];
};
operation.completionBlock = ^{
};
operation.fetchNotificationChangesCompletionBlock = ^(CKServerChangeToken *token, NSError *error) {
NSLog(@"Missed notifications: %@", array);
};
[_myContainer addOperation:operation];
回答1:
NSMutableArray *array = [NSMutableArray array];
CKFetchNotificationChangesOperation *operation = [[CKFetchNotificationChangesOperation alloc] initWithPreviousServerChangeToken:nil];
operation.notificationChangedBlock = ^(CKNotification *notification) {
[array addObject:notification.notificationID];
};
operation.completionBlock = ^{
};
operation.fetchNotificationChangesCompletionBlock = ^(CKServerChangeToken *token, NSError *error) {
NSLog(@"Missed notifications: %@", array);
};
[_myContainer addOperation:operation];
来源：https://stackoverflow.com/questions/30993115/how-to-use-ckfetchnotificationchangesoperation