Delay when using openURL right after after app launch

Question

I am trying to launch another application using its url handler right on my own app launch.

- (void)applicationDidBecomeActive:(UIApplication *)application
{        
     NSURL *actionURL = [NSURL URLWithString:@"fantastical2://"];
     [[UIApplication sharedApplication] openURL:actionURL];
}

It basically works, however there is a significant delay of about 7 seconds from seeing my app appear to actually opening the URL.

How come the delay? How can I launch open a URL/app immediately when launching my own app or reduce this delay?

Perfect. That works. Thanks a lot. Would you add that comment as answer then I can mark it accordingly. — Bernd, Nov 12 '13 at 10:07
I think this is better asked and answered [here](http://stackoverflow.com/q/19356488/1362154) — Smilin Brian, Nov 23 '13 at 04:54

score 4 · Answer 1 · answered Feb 27 '17 at 07:33

You can resolve using any of the examples below.

Using diapatch_async

dispatch_async(dispatch_get_main_queue(), ^{
    [[UIApplication sharedApplication] openURL:urlString];
});

Using perfomSelector

- (void)applicationDidBecomeActive:(UIApplication *)application
{
  ...

  //hangs for 10 seconds
  //[[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];

  //Fix: use threads!
  [self performSelector:@selector(redirectToURL:)
      withObject:url afterDelay:0.0];

  ...
}

- (void)redirectToURL:(NSString *)url
{
  [[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];
}

Using NSThread

- (void)applicationDidBecomeActive:(UIApplication *)application
{
  ...

  //hangs for 10 seconds
  //[[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];

  //Fix: use threads!
  [NSThread detachNewThreadSelector:@selector(openBrowserInBackground:)
      toTarget:self withObject:url];

  ...
}

- (void)openBrowserInBackground:(NSString *)url
{
  [[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];
}

score 1 · Accepted Answer · answered Nov 12 '13 at 10:17

1

Try with the NSTimer with target ..

For just Reference :

[NSTimer scheduledTimerWithTimeInterval:7.0
    target:self
    selector:@selector(targetMethod:)
    userInfo:nil
    repeats:NO];


 -(void) targetMethod{
    // Call Here ...
     NSURL *actionURL = [NSURL URLWithString:@"fantastical2://"];
     [[UIApplication sharedApplication] openURL:actionURL];

    //Invalidate the time
    [myTimer invalidate];
    myTimer = nil;
 }

answered Nov 12 '13 at 10:17

Kumar KL

15,315
9
38
60

1

I also noticed that the time interval shouldn't be 0.0 even when I want to call the method immediately. – Bernd Nov 12 '13 at 10:24

score 0 · Answer 3 · answered Nov 12 '13 at 09:22

0

Add your code in - (void)applicationDidFinishLaunching:(UIApplication *)application because - (void)applicationDidBecomeActive:(UIApplication *)application will be called after applicationDidFinishLaunching is called.

answered Nov 12 '13 at 09:22

kaar3k

994
7
15

score 0 · Answer 4 · answered Jan 10 '17 at 11:50

Try calling the -openURL method within a block that runs on the main thread. This will cause it to execute once everything else is loaded:

-(void)applicationDidBecomeActive:(UIApplication *)application {
    dispatch_async(dispatch_get_main_queue(), ^{
        NSURL *actionURL = [NSURL URLWithString:@"fantastical2://"];
        [[UIApplication sharedApplication] openURL:actionURL];
    });
}

Delay when using openURL right after after app launch

4 Answers4

Using diapatch_async

Using perfomSelector

Using NSThread