处理键盘高度

2019独角兽企业重金招聘Python工程师标准>>>

苹果官方demo

首先需要监听两个关于键盘的通知

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillShow:)

                                                 name:UIKeyboardWillShowNotification

                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(keyboardWillHide:)

                                                 name:UIKeyboardWillHideNotification

                                               object:nil];

监听到通知后需要实现的方法

- (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.textView.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.textView.frame = self.view.bounds;

    

    [UIView commitAnimations];

}

转载于:https://my.oschina.net/wangshitou/blog/170883