Add a running countup display timer to an iOS app, like the Clock stopwatch?

by

If you look in the iAd sample code from Apple in the basic banner project they have a simple timer: 

NSTimer *_timer; 
_timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];

and the the method they have 

- (void)timerTick:(NSTimer *)timer
{
    // Timers are not guaranteed to tick at the nominal rate specified, so this isn't technically accurate.
    // However, this is just an example to demonstrate how to stop some ongoing activity, so we can live with that inaccuracy.
    _ticks += 0.1;
    double seconds = fmod(_ticks, 60.0);
    double minutes = fmod(trunc(_ticks / 60.0), 60.0);
    double hours = trunc(_ticks / 3600.0);
    self.timerLabel.text = [NSString stringWithFormat:@"%02.0f:%02.0f:%04.1f", hours, minutes, seconds];
}

It just runs from start up, pretty basic.

More Related Contents:

  1. Convert NSTimer to NSUInterval for Array Index
  2. Should IBOutlets be strong or weak under ARC?
  3. Proper way to exit iPhone application?
  4. Getting current device language in iOS?
  5. How do I create a basic UIButton programmatically?
  6. Why NSUserDefaults failed to save NSMutableDictionary in iOS?
  7. How do I wrap text in a UITableViewCell without a custom cell
  8. UIButton inside a view that has a UITapGestureRecognizer
  9. Hide separator line on one UITableViewCell
  10. How do I make UILabel display outlined text?
  11. Fade/dissolve when changing UIImageView’s image
  12. How do I scroll the UIScrollView when the keyboard appears?
  13. Counting the number of lines in a UITextView, lines wrapped by frame size
  14. Detecting whether or not device support phone calls?
  15. Can I get a NSURL from an XCAssets bundle?
  16. Send a file as attachment in objective c
  17. How to detect iphone is on silent mode
  18. How to specify size for iPhone 6/7 customised edge-to-edge image?
  19. Cocoa-Touch: How do I see if two NSDates are in the same day?
  20. How can I delay a method call for 1 second?
  21. AVAudioPlayer throws breakpoint in debug mode
  22. Setting scroll position in UITableView
  23. Creating iPhone Pop-up Menu Similar to Mail App Menu
  24. rotate a UIView around its center but several times
  25. Dismissing both UINavigation views and Modal views at once programmatically
  26. What does the NS prefix mean?
  27. Rounded Corners on UIImage
  28. How do I disable a UIButton?
  29. Decrease the width of the last line in multiline UILabel
  30. Differentiate between screen lock and home button press on iOS7

Leave a Comment