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Progress and Activity Indicators

/ Published in: Objective C
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When performing tasks that may take some time, you often need to provide some kind of visual feedback to your users. If you know how long the task will take to complete, you can use a progress indicator to show the user how much of the task has been performed and how much still has to run. If you are unable to determine the duration of the task, use a “busy” indicator (such as the beach ball or hourglass on OS X).

iOS provides classes for showing both progress and activity.

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  1. // Showing progress 
  2.  
  3. NSTimer *timer;
  4.  
  5. - (void)updateProgress:(NSTimer *)sender
  6. {
  7. 	UIProgressView *progress = [sender userInfo];
  8.  
  9. 	//have we completed?
  10. 	if (progress.progress == 1.0)
  11. 		[timer invalidate];
  12. 	else
  13. 		progress.progress += 0.05;
  14. }
  15.  
  16. - (void)viewDidLoad {
  17.  
  18.     [super viewDidLoad];
  19.  
  20. 	UIProgressView *myProgressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
  21.  
  22. 	CGRect progressFrame = CGRectMake(10,100,300,25);
  23. 	[myProgressView setFrame:progressFrame];
  24.  
  25. 	[myProgressView setProgress:0.0];
  26.  
  27. 	[self.view addSubview:myProgressView];
  28.  
  29. 	//create timer
  30. 	timer = [[NSTimer scheduledTimerWithTimeInterval:0.1 
  31. 											  target:self 
  32. 											selector:@selector(updateProgress:) 
  33. 											userInfo:myProgressView 
  34. 											 repeats:YES] retain];
  35. }
  36.  
  37.  
  38. // Showing Activity 
  39.  
  40.  
  41. - (void)viewDidLoad {
  42.  
  43.     [super viewDidLoad];
  44.  
  45. 	[self.view setBackgroundColor:[UIColor blackColor]];
  46.  
  47. 	UIActivityIndicatorView *myActivityView = [[UIActivityIndicatorView alloc] 
  48. 											   initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
  49.  
  50. 	CGRect activityFrame = CGRectMake(130,100,50,50);
  51. 	[myActivityView setFrame:activityFrame];
  52. 	myActivityView.hidesWhenStopped = YES;	
  53. 	[myActivityView startAnimating];
  54.  
  55. 	[self.view addSubview:myActivityView];
  56.  
  57. }

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