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

Try this,I deal with this issue as follows:

in -(void)viewDidLoad add the following :

NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

[center addObserverForName:UIApplicationDidBecomeActiveNotification
                    object:nil
                     queue:[NSOperationQueue mainQueue]
                usingBlock:^(NSNotification *note)
 {
     // use instance flag to know
     if (self.isBeginCallPhone)
     {
         //do some thing
         self.isBeginCallPhone = NO;
     }
 }];

Do not forget：

- (void)dealloc{
    [[NSNotificationCenter defaultCenter]removeObserver:self];
  }