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PONSTimer displayed in label then disappears?
 

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    <p>I have a viewController that loads my imagePickerController from a button action. When the imagePickerController loads it should display, with an overlay, two labels with predetermined data. One is timerLabel and the other is titleLabel. Both labels are displayed with the correct data when the imagePickerController first loads but after only a moment, the timerLabel data disappears but the label itself is still there. In my refreshLabel method, the NSLogged timerLabel is correct but when it gets to the NSLog for startDate and timeLeft it returns (null). Any ideas? thanks!</p> <pre><code> - (IBAction)startCamera:(id)sender { if (self.image == nil &amp;&amp; [self.videoFilePath length] == 0) { self.imagePickerController = [[UIImagePickerController alloc] init]; self.imagePickerController.delegate = self; self.imagePickerController.allowsEditing = NO; self.imagePickerController.videoMaximumDuration = 10; if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { self.imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; } else { self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; } self.imagePickerController.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePickerController.sourceType]; [self presentViewController:self.imagePickerController animated:NO completion:nil];} [[NSBundle mainBundle] loadNibNamed:@"OverlayView" owner:self options:nil]; self.overlayView.frame = CGRectMake(160,8,0,0); self.imagePickerController.cameraOverlayView = self.overlayView; NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSString *deadline = [NSString stringWithFormat:@"%@/deadline.txt", documentsDirectory]; NSString *name = [NSString stringWithFormat:@"%@/name.txt", documentsDirectory]; NSError *fileError; titleLabel.text = [NSString stringWithContentsOfFile:name encoding:NSASCIIStringEncoding error:&amp;fileError]; timerLabel.text = [NSString stringWithContentsOfFile:deadline encoding:NSASCIIStringEncoding error:&amp;fileError]; if(fileError.code == 0){ NSLog(@"deadline.txt was read successfully with these contents: %@,", timerLabel.text); NSLog(@"name.txt was read successfully with these contents: %@,", titleLabel.text);} NSLog(@"timer label %@", timerLabel.text); [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(refreshLabel) userInfo:nil repeats:YES]; } -(void)refreshLabel { NSLog(@"timer label %@", timerLabel.text); NSDate *startDate = [self.formatter dateFromString:timerLabel.text]; NSDate *timeLeft = [startDate dateByAddingTimeInterval:-1]; NSLog(@"start time %@",startDate); NSLog(@"time left %@",timeLeft); NSTimeInterval totalCountdownInterval =1; NSTimeInterval elapsedTime = [timeLeft timeIntervalSinceNow]; NSTimeInterval remainingTime = totalCountdownInterval - elapsedTime; self.timerLabel.text = [self.formatter stringFromDate:timeLeft]; if (remainingTime &lt;= 0.0) { //dismiss controller and set to homecontroller at tabBar index 1 } } </code></pre>
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    1. USJared Gross
    1. USJared Gross
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    1. CODo you know that it's the label itself that goes away, or just the text in the label? If you don't know, give the label a background color, and then you'll be able to see.
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      1. USrdelmar
    2. COGood call. It is just the text in the label. The background color sticks around. Do you know what it could be? It's got to be something with the refreshLabel method that isn't syncing up.
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      1. PONSTimer displayed in label then disappears?
      1. USJared Gross
    3. COYou should do some logging to track down the problem. Log startDate and timeLeft to make sure neither is nil. Also, you should move the first two lines in refreshLabel to somewhere else, like viewDidLoad -- no need to create a new one every time the timer fires.
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      1. PONSTimer displayed in label then disappears?
      1. USrdelmar
 

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