Keyboard handling during iOS input; ios Input Keyboard handling

Keyboard handling during iOS input; ios Input Keyboard handling

During iOS development, you sometimes need to handle keyboard pop-up and retrieval.

And how to process the view during keyboard pop-up retrieval

The most formal method is to use notifications.

 

Step 1:
Add monitoring when entering the view: (viewDidLoad or something)

 

// Listen to the keyboard notification [[NSNotificationCenter defacenter center] addObserver: self selector: @ selector (keyboardWillShow :) name: jsonobject: nil]; [[nsicationicationcenter defacenter center] addObserver: self selector: @ selector (keyboardWillHide :) name: UIKeyboardWillHideNotification object: nil];

 

Step 2:
Move the view during keyboard action:

 

- (void)keyboardWillShow:(NSNotification *)notification {        /*     Reduce the size of the text view so that it's not obscured by the keyboard.     Animate the resize so that it's in sync with the appearance of the keyboard.     */    NSDictionary *userInfo = [notification userInfo];        // Get the origin of the keyboard when it's displayed.    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];    // Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.    CGRect keyboardRect = [aValue CGRectValue];    keyboardRect = [self.view convertRect:keyboardRect fromView:nil];        CGFloat keyboardTop = keyboardRect.origin.y;    CGRect newTextViewFrame = self.view.bounds;    newTextViewFrame.size.height = keyboardTop - self.view.bounds.origin.y;        // Get the duration of the animation.    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];    NSTimeInterval animationDuration;    [animationDurationValue getValue:&animationDuration];        // Animate the resize of the text view's frame in sync with the keyboard's appearance.    [UIView beginAnimations:nil context:NULL];    [UIView setAnimationDuration:animationDuration];        self.reportTableView.frame = newTextViewFrame;    [UIView commitAnimations];}- (void)keyboardWillHide:(NSNotification *)notification {        NSDictionary* userInfo = [notification userInfo];        /*     Restore the size of the text view (fill self's view).     Animate the resize so that it's in sync with the disappearance of the keyboard.     */    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];    NSTimeInterval animationDuration;    [animationDurationValue getValue:&animationDuration];        [UIView beginAnimations:nil context:NULL];    [UIView setAnimationDuration:animationDuration];        self.reportTableView.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height  - 55 - 64);        [UIView commitAnimations];}

 

 

Step 3:
Logout notification when exiting View
ViewDidUnload:

     [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

 

Step 4:
Dealloc:

-(void)dealloc{    [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:nil];}

 

These codes are from apple sample code KeyboardAccessory.

 

Modify the details by yourself, such as the reportTableView and CGRectMake (0, 0, [UIScreen mainScreen]. bounds. size. width, [UIScreen mainScreen]. bounds. size. height-55-64)