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Question

Making a Method happen every 60 seconds when the App is running.

Answer 1

+5 A:

NSTimer

- (void) startTimer
{
  self.myTimer = [NSTimer scheduledTimerWithTimeInterval:60
                                                  target:self
                                                selector:@selector(timerFired:)
                                                userInfo:nil
                                                 repeats:YES];
}

- (void) stopTimer
{
    [self.myTimer invalidate];
}

- (void) timerFired:(NSTimer*)theTimer
{
    NSLog(@"yay");
}

slf 2009-09-27 14:52:26

Hmm. http://snapplr.com/fmga

Joshua 2009-09-27 14:59:33

You have to add a myTimer property to your class.

Georg 2009-09-27 15:08:19

What do you mean?

Joshua 2009-09-27 15:14:33

`self.myTimer` indicates that the object has an instance variable called `myTimer`. You have to add a `NSTimer *myTimer` declaration to the list of instance variables for the class.

mipadi 2009-09-27 15:26:28

I tried putting `NSTimer *myTimer` into the Header file, but … http://snapplr.com/zyv2

Joshua 2009-09-27 15:31:38

-> this should go into your @interface: @property NSTimer *myTimer; This should go into your @implementation: @synthesize myTimer;

Georg 2009-09-27 15:41:33

Still one error. http://snapplr.com/r7w7

Joshua 2009-09-27 15:50:40

@Joshua - Jeebus! how do you expect to add a property to a class when it's outside of the interface?

Abizern 2009-09-27 15:53:45

Joshua, I recommend you re-read http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/ObjectiveC/Introduction/introObjectiveC.html to brush up on class definitions

sbooth 2009-09-27 16:17:29

Seriously -- go read the basic introduction to cocoa programming guides. These kinds of questions indicate a complete lack of knowledge of the targeted environment. Nothing wrong with that, but fixing it with sequences of questions like the above will get you nowhere fast.

bbum 2009-09-27 18:12:29

If his past questions and answers and comments are any indication, Joshua does not read or write code. If you don't provide him a code sample, he's stuck. If you do provide him a code sample, he copies it and pastes it into his app verbatim and then asks in comments about the errors that ensue when it doesn't work.

Peter Hosey 2009-09-27 19:01:26

I and others have told him to read the documentation and/or a book before. I think it's pretty clear that he's ignoring that advice and continuing on his current path.

Peter Hosey 2009-09-27 19:03:12

And just after I wrote that, I see that he's reasoned his own solution to a problem. Maybe he is making progress after all? http://stackoverflow.com/questions/1483676/making-a-nspopupbutton-display-all-my-ical-calandars#comment-1335225 I'm not saying we should write him off entirely. My suggestion is, don't give him code samples. Give him specific advice in English, perhaps with documentation links, instead.

Peter Hosey 2009-09-27 19:10:14

Answer 2

+1 A:

While the answer is valid, your question is incomplete.

Why do you need to run this method regularly? If it is to poll iCal for tasks every 60 seconds this isn't the best solution. What you need to be doing is observing the notifications that CalCalender store puts outs

Abizern 2009-09-27 16:16:30

Really, It needs to be triggered whenever something changes in an NSOutlineView, like a Row is added, deleted or editing. Is there something I could observe for that?

Joshua 2009-09-27 16:26:19

You can post your own notifications from the methods that do the adding, deleting and editing.

Abizern 2009-09-27 16:38:16

I see. How would you post notifications?

Joshua 2009-09-27 17:15:34

This document on notifications should help. It has a section on posting notifications: http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Notifications/Introduction/introNotifications.html

nall 2009-09-27 17:28:40

Even better, use Key-Value Observing. Add yourself as an observer of the array property on the controller that owns it.

Peter Hosey 2009-09-27 18:59:05

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