Open Radar

 
Area:
Notifications

Summary:
`application(_:didReceiveRemoteNotification:fetchCompletionHandler:)` is not invoked for silent pushes (pushes without notification text, sound nor badge). Silent pushes works on latest iOS versions prior to iOS 11, also are well documented by Apple:
> “The payload’s aps dictionary must include the
> content-available key with a value of 1. The
> payload’s aps dictionary must not contain the
> alert, sound, or badge keys.” 
(https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CreatingtheNotificationPayload.html#//apple_ref/doc/uid/TP40008194-CH10-SW1)
Absence of silent pushes will break backward iOS compatibility and badly affect lot of apps from the AppStore.

Steps to Reproduce:
1. Create an app, enable push notifications and background modes for remote notifications. Configure all certificates as described in Apple documentation. 
2. Implement `application(_:didReceiveRemoteNotification:fetchCompletionHandler:)`.
3. Send a push with following content:
{code}
{
    "aps" : {
        "content-available" : 1
    },
    "acme1" : "bar",
    "acme2" : 42
}
{code}

Expected Results:
`application(_:didReceiveRemoteNotification:fetchCompletionHandler:)` should be invoked as described in Apple documentation.

Actual Results:
`application(_:didReceiveRemoteNotification:fetchCompletionHandler:)` is being called on iOS 9 and iOS 10, but not on iOS 11 beta 9.
iOS 11 logs: 
{code}
default	17:24:58.254964 +0200	SpringBoard	Received incoming message on topic xx.xxx.xxxxxxx at priority 1
default	17:24:58.257488 +0200	SpringBoard	[xx.xxx.xxxxxxx] Received remote notification request 678F-AAA1 [ hasAlertContent: 0, hasSound: 0 hasBadge: 0 hasContentAvailable: 1 hasMutableContent: 0 ]
default	17:24:58.257680 +0200	SpringBoard	[xx.xxx.xxxxxxx] Deliver push notification request 678F-AAA1
default	17:24:58.257887 +0200	SpringBoard	[xx.xxx.xxxxxxx] Passing content-available push to Duet
default	17:24:58.258107 +0200	SpringBoard	SUBMITTING:  
error	17:24:58.258296 +0200	SpringBoard	Ignoring notification with no alert, sound or badge (xx.xxx.xxxxxxx): 678F-AAA1
default	17:24:58.258485 +0200	SpringBoard	[xx.xxx.xxxxxxx] Not saving push notification 678F-AAA1 to store [ error=Error Domain=UNErrorDomain Code=1401 "Notification has no user-facing content" UserInfo={NSLocalizedDescription=Notification has no user-facing content} ]
{code}

Version/Build:
iOS 11 beta 9 (15A5370a)

Configuration:
iPhone 7 Plus (MN4M2PM/A)