Display CFUserNotificationDisplayAlert on iPhone Lock Screen
I m creating an app that has to display CFUserNotificationDisplayAlert even if iPhone Screen is Locked, currently i am using this code
CFOptionFlags responseFlags = 0;
CFUserNotificationDisplayAlert(20.0, 3, NULL, NULL, NULL, CFSTR("Hello"), CFSTR("Hello World"), CFSTR("OK"), NULL, NULL, &responseFlags);
This works great on Home Screen but doesnt pop up if the screen is locked. Is there anything else i have to add to it to make it appear on the Lock Screen as well?
You need to use the kCFUserNotificationAlertTopMostKey key.
extern CFStringRef kCFUserNotificationAlertTopMostKey;
CFStringRef keys[] = {
kCFUserNotificationAlertTopMostKey,
kCFUserNotificationAlertHeaderKey,
kCFUserNotificationAlertMessageKey
};
CFStringRef values[] = {
kCFBooleanTrue,
CFSTR("Title"),
CFSTR("Message")
};
CFDictionaryRef dict = CFDictionaryCreate(NULL, keys, values,
sizeof(keys)/sizeof(*keys),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
SInt32 err = 0;
CFUserNotificationRef notif = CFUserNotificationCreate(NULL,
0, kCFUserNotificationPlainAlertLevel, &err, dict);
CFRelease(dict);
...
See http://iphonedevwiki.net/index.php/CFUserNotification for all dialog description keys for iPhone OS ≤ 3.1.
(Note that while it will show on the lock screen, the phone won't wake up by itself.)
CFUserNotification is not supported on the iPhone OS. Push Notifications are the iPhone equivalent.