在某些情况下只发出没有声音的通知

Question

The app is registered to receive all the 3 kinds of notifications (badge, alert, sound).

I want that push notifications be with NO sound in background JUST IN some situations (in the app user click a button to disable notifications) and to allow the sound for all the other cases.

Do you have some ideas? Thanks

Answer 1

From Apple's Remote Notification Guide:

The aps dictionary can also contain the content-available property. The content-available property with a value of 1 lets the remote notification act as a “silent” notification. When a silent notification arrives, iOS wakes up your app in the background so that you can get new data from your server or do background information processing. Users aren't told about the new or changed information that results from a silent notification, but they can find out about it the next time they open your app.

To support silent remote notifications, add the remote-notification value to the UIBackgroundModes array in your Info.plist file. To learn more about this array, see UIBackgroundModes in Information Property List Key Reference.

Depending on your model (assuming a system like Parse or something), store the user's preference in the cloud and, when generating your PUSH notifications, decide whether to add this flag or not.