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December 10, 2013 15:33
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Starting with this tutorial (http://www.cocoawithlove.com/2008/10/sliding-uitextfields-around-to-avoid.html) I ended up with these methods to handle scrolling the view when the iOS keyboard is shown. This performs the minimum amount of scrolling needed to show the selected text field plus a 10 point padding. This was used on a view using autolay…
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| @interface DelegateController : UIViewController <UITextFieldDelegate> { | |
| CGFloat keyboardAnimatedDistance; | |
| } |
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| @implementation DelegateController | |
| static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3; | |
| static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216; | |
| static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162; | |
| - (void)textFieldDidBeginEditing:(UITextField *)textField { | |
| CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField]; | |
| CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view]; | |
| CGFloat viewHeight, bottomOfTextField, topOfKeyboard; | |
| UIDeviceOrientation orientation = [UIDevice currentDevice].orientation; | |
| if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) { | |
| viewHeight = viewRect.size.height; | |
| bottomOfTextField = textFieldRect.origin.y + textFieldRect.size.height; | |
| topOfKeyboard = viewHeight - PORTRAIT_KEYBOARD_HEIGHT - 10; // 10 point padding | |
| } else { | |
| viewHeight = viewRect.size.width; | |
| bottomOfTextField = textFieldRect.origin.x + textFieldRect.size.width; | |
| topOfKeyboard = viewHeight - LANDSCAPE_KEYBOARD_HEIGHT - 10; // 10 point padding | |
| } | |
| if (bottomOfTextField >= topOfKeyboard) keyboardAnimatedDistance = bottomOfTextField - topOfKeyboard; | |
| else keyboardAnimatedDistance = 0.0f; | |
| CGRect viewFrame = self.view.frame; | |
| viewFrame.origin.y -= keyboardAnimatedDistance; | |
| [UIView beginAnimations:nil context:NULL]; | |
| [UIView setAnimationBeginsFromCurrentState:YES]; | |
| [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION]; | |
| [self.view setFrame:viewFrame]; | |
| [UIView commitAnimations]; | |
| } | |
| - (void)textFieldDidEndEditing:(UITextField *)textField { | |
| CGRect viewFrame = self.view.frame; | |
| viewFrame.origin.y += keyboardAnimatedDistance; | |
| [UIView beginAnimations:nil context:NULL]; | |
| [UIView setAnimationBeginsFromCurrentState:YES]; | |
| [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION]; | |
| [self.view setFrame:viewFrame]; | |
| [UIView commitAnimations]; | |
| } | |
| @end |
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