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ScrollView doesn't respond after TextField input is done

/ Published in: Objective C
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  1. ==============================
  2. DECLARATION FILE
  3. ==============================
  4. @interface ScrollViewViewController : UIViewController <UIScrollViewDelegate, UITextFieldDelegate>
  5. {
  6. 	UIScrollView *m_scrollView;
  7. 	UITextField *m_textField1;
  8. 	UITextField *m_textField2;
  9. }
  10.  
  11. @property(nonatomic,retain) IBOutlet UIScrollView *m_scrollView;
  12. @property(nonatomic,retain) IBOutlet UITextField *m_textField1;
  13. @property(nonatomic,retain) IBOutlet UITextField *m_textField2;
  14.  
  15. - (void)scrollViewToCenterOfScreen:(UIView *)theView;
  16.  
  17. @end
  18.  
  19. ==============================
  20. IMPLEMENTATION FILE
  21. ==============================
  22. - (void)viewDidLoad {
  23.     [super viewDidLoad];
  24.  
  25. 	m_scrollView.contentSize = CGSizeMake(320, 1000);
  26. 	[self.view addSubview:m_scrollView];
  27. }
  28.  
  29. ...
  30. #pragma mark * TextField Delegate Methods
  31. - (BOOL)textFieldShouldReturn:(UITextField *)textField
  32. {
  33. 	[textField resignFirstResponder];
  34. 	return NO;
  35. }
  36.  
  37. - (void)textFieldDidBeginEditing:(UITextField *)textField
  38. {
  39. 	[self scrollViewToCenterOfScreen:textField];
  40. }
  41.  
  42. - (void)scrollViewToCenterOfScreen:(UIView *)theView 
  43. {  
  44. 	CGRect keyboardBounds;
  45.     CGFloat viewCenterY = theView.center.y;  
  46.     CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];  
  47.  
  48.     CGFloat availableHeight = applicationFrame.size.height - keyboardBounds.size.height;    // Remove area covered by keyboard  
  49.  
  50.     CGFloat y = viewCenterY - availableHeight / 2.0;  
  51.     if (y < 0) {  
  52.         y = 0;  
  53.     }  
  54.     m_scrollView.contentSize = CGSizeMake(applicationFrame.size.width, applicationFrame.size.height + keyboardBounds.size.height);  
  55.     [m_scrollView setContentOffset:CGPointMake(0, y) animated:YES];
  56. }

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