弹出键盘 tableview定位到编辑位置

本文介绍了一种在iOS应用中处理键盘弹出时调整TableView大小的方法。通过监听键盘将要显示的通知,获取键盘的位置信息,并据此调整TableView的高度,确保输入框可见。同时,通过动画效果同步调整TableView的大小,实现平滑过渡。

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- (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 = tableViewRect;

    newTextViewFrame.size.height = keyboardTop - self.tableView.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.tableView.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 = 0.1;

    [animationDurationValue getValue:&animationDuration];

    

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationDuration:animationDuration];

    

    self.tableView.frame = tableViewRect;

    

    [UIView commitAnimations];

}


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