Work around for currently not working behavior='height' of KeyboardAvoidingView

KeyboardAvoidingView.js

/**
 * Work around for currently not working behavior='height' of KeyboardAvoidingView
 * Please note that this is just a way around the issue and not an actual fix
 * Tested on:
 *  - iOS 10.2 (both simulator and actual device): react 16.0.0-alpha.6 & react-native 0.44.2
 * @see https://github.com/facebook/react-native/issues/13754
 * @see https://stackoverflow.com/questions/41616457/keyboardavoidingview-reset-height-when-keyboard-is-hidden
 * @see https://github.com/facebook/react-native/blob/master/Libraries/Components/Keyboard/KeyboardAvoidingView.js#L163-L166
 * Issues:
 *  - onLayout is not called when the keyboard is dismissed,
 *      therefore this.frame.height does not get updated back to its initial value.
 *      rendered height calculation is: this.frame.height - this.state.bottom
 *      where this.state.bottom is the keyboad height,
 *      so frame.height does not actually need to be reduced when keyboards pops up
 *  - OnLayout is called after 'render', so even if it was actually called, it would not work properly
 *      could be fixed by triggering another render but it would not be good for performance
 * Fix: fixate value of this.frame.height to its initial value before component update
 */
import React from 'react';
import { KeyboardAvoidingView } from 'react-native';

export default class KeyboardAvoidingViewFix extends KeyboardAvoidingView {

  static propTypes = {
    ...KeyboardAvoidingView.PropTypes
  }

  _initial_layout_height = null;

  componentWillUpdate (nextProps, nextState, nextContext) {
    if (this.frame) {
      this._initial_layout_height = this._initial_layout_height || this.frame.height;
      this.frame.height = this._initial_layout_height;
    }
    super.componentWillUpdate(nextProps, nextState, nextContext);
  }
}

@escobar5 @mienaikoe
same issue here, how did you solve it?

Replace componentWillUpdate to UNSAFE_componentWillUpdate (react-native 0.56)

doesn't fix the problem for me