How can I find out whether the user pressed the Call or the Cancel button when making a call from my app?

Question

I need to return to my app after making a call from my app, so I use this code:

NSURL *url = [NSURL URLWithString:@\"telprompt://123-4567-890\"]; 
[[UIApplic         


        

Answer 1

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(suspended:) name:@"UIApplicationSuspendedNotification" object:nil];

The above code by @J Saprio works absolutely fine. Before it suspends the Application NSNotificationCenter call UIApplicationSuspendedNotification. Once you click the "call" it will execute the (suspended:) method. Here the catch is, every time you call NSNotificationCenter method it will give a call to (suspended:) with the increment of one. Solution is to remove the observer for NSNotificationCenter. Following is the snippet for it. It will help you to execute the following method only once.

-(void)suspended:(NSNotification *) notification
{
    NSLog(@"Suspended");
   [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UIApplicationSuspendedNotification" object:nil];

}