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Display CFUserNotificationDisplayAlert on iPhone Lock Screen

Answer 1

+1 A:

CFUserNotification is not supported on the iPhone OS. Push Notifications are the iPhone equivalent.

rpetrich 2010-03-08 04:46:21

It is supported, i have this working as i described in my question but the problem is that its not appearing on the lock screen, however it does appear on the screen when iphone is not locked.

raziiq 2010-03-08 05:54:30

Just because it works, doesn't mean it is supported. We developers on the jailbreak side of the fence use a *ton* of APIs that work (for some definition of work) that aren't supported by Apple. `CFUserNotification`s will *not* show on the lock screen; *push notifications* will.

rpetrich 2010-03-08 06:11:30

Just browsing through your questions and it appears you are a jailbreak dev. If you need to show an alert on the SpringBoard (including the lockscreen), you can create an SBAlertItem subclass at runtime, customize it and activate it--it will show on the lock screen.

rpetrich 2010-03-08 06:16:23

Ya you are right, i can use SBAlertItem subclass but still dont know how to instantiate classes on the runtime, if you have some source on how to do that, please post.

raziiq 2010-03-08 06:47:47

MobileSubstrate has an example of creating a new class at runtime: http://svn.saurik.com/repos/menes/trunk/mobilesubstrate/MobileSafety.mm It even uses SBAlertItem :)

rpetrich 2010-03-08 06:51:46

ahhh, again mobilesubstrate, tried getting hold of it quite sometimes but its really complex, tried ipodtouchfansforum tutorials also but to no avail. You know of any good tutorial on mobilesubstrate??

raziiq 2010-03-08 06:59:09

`objc_allocateClassPair` to create a new class, then add methods using `class_addMethod`, then `objc_registerClassPair`, and finally you can send `alloc` to the class to create an new instance. After that, it's `SBAlertItem`-specific code.

rpetrich 2010-03-09 04:27:50

Also, best place to get help on jailbreak-specific development is in #iphone on irc.saurik.com

rpetrich 2010-03-09 04:29:39

Answer 2

+2 A:

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.)

KennyTM 2010-03-14 07:26:34

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Display CFUserNotificationDisplayAlert on iPhone Lock Screen

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