objective-c : modify textView size when keyboard appears

snippet.m

//modify textView size when keyboard appears and disappears
 
//Add the following instance variable to NoteEditorViewController.m
 
 
@implementation NoteEditorViewController
{
  	//...
    CGRect _textViewFrame; //used to store the current text view frame
}
 
 
//update viewDidLayoutSubviews to make use of this newly added instance variable
 
- (void)viewDidLayoutSubviews 
{ 
	//called to notify the view controller that view has just laid out subviews
    //...
    _textView.frame = _textViewFrame;
}
 
 
//add the following to the bottom of viewDidLoad to set the initial frame value
 
- (void)viewDidLoad
{
    //...
    _textViewFrame = self.view.bounds;
    //...
}
 
 
//update _textViewFrame variable when the keyboard is shown
 
#pragma mark - UITextView 델리게이트 메소드
 
- (void)textViewDidBeginEditing:(UITextView *)textView 
{
    //텍스트 뷰 사이즈 조정
    [UIView animateWithDuration:0.3 animations:^{
        _textViewFrame = self.view.bounds;
        _textViewFrame.size.height -= 216.0f; //reduces the height of the on-screen keyboard
        _textView.frame = _textViewFrame;
    }];
}
 
 
//return the text view frame to its original size when editing finishes
 
- (void)textViewDidEndEditing:(UITextView *)textView
{
    //copy the updated note text to the underlying model
    self.note.contents = textView.text;
    
    _textViewFrame = self.view.bounds;
    _textView.frame = _textViewFrame;
}