Block for CallState not invoked iOS 7 - ios

Question

I am trying to monitor the callStates.I implemented an own class for this with this init method:
- (id) init
{
self = [super init];
if (!self) return nil;
callCenter = [[CTCallCenter alloc] init];
[callCenter setCallEventHandler: ^(CTCall* call) {
if ([call.callState isEqualToString: CTCallStateConnected]) {
} else if ([call.callState isEqualToString: CTCallStateDialing]) {
} else if ([call.callState isEqualToString: CTCallStateDisconnected]) {
} else if ([call.callState isEqualToString: CTCallStateIncoming]) {
}
NSLog(#"\n\n callEventHandler: %# \n\n", call.callState);
}];
return self;
}
#property(nonatomic, strong) CTCallCenter* callCenter;
I linked the CoreTelephony Framework in my Project...But the Block never gets called...If i put the same Code in my AppDelegate, it works...
Des it only work in AppDelegate?!
UPDATE:
I allocate my Class in my AppDelegate:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
VoiceReceiver *v __attribute__((unused)) = [[VoiceReceiver alloc] init];
....
}

Answer 1

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
VoiceReceiver *v __attribute__((unused)) = [[VoiceReceiver alloc] init];
....
}
Will not work. As soon as this callback is finished v will be dealloc'd.
If you need to use it in the appDelegate. Make the calss a property in the .h and init it where you are now.
e.g.
appDeletage.h
#property (nonatomic, strong) VoiceReceiver *voiceReciever;
appDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
voiceReciever = [[VoiceReceiver alloc] init];
....
}
The key difference here is that the appDeleagte is a singleton that will always be in memory so long as the app is running. Adding a strong property to this means it won't be removed unless the app crashes.