Merge pull request #416 from cyhsutw/change-keyboard-frame-animation

Animate views when switching from the a keyboard to a custom input view.

Author: Ignacio Romero Zurbuchen

Source/SLKTextViewController.m

@@ -1365,6 +1365,9 @@ - (void)slk_willShowOrHideKeyboard:(NSNotification *)notification
         [self slk_hideAutoCompletionViewIfNeeded];
     }
 
+    // store the previous keyboard height
+    CGFloat preKeyboardHeight = self.keyboardHC.constant;
+
     // Updates the height constraints' constants
     self.keyboardHC.constant = [self slk_appropriateKeyboardHeightFromNotification:notification];
     self.scrollViewHC.constant = [self slk_appropriateScrollViewHeight];
@@ -1390,7 +1393,8 @@ - (void)slk_willShowOrHideKeyboard:(NSNotification *)notification
 
     // Begin and end frames are the same when the keyboard is shown during navigation controller's push animation.
     // The animation happens in window coordinates (slides from right to left) but doesn't in the view controller's view coordinates.
-    if (!CGRectEqualToRect(beginFrame, endFrame))
+    // Second condition: check if the height of the keyboard changed.
+    if (!CGRectEqualToRect(beginFrame, endFrame) || fabs(preKeyboardHeight - self.keyboardHC.constant) >= FLT_EPSILON)
     {
         // Only for this animation, we set bo to bounce since we want to give the impression that the text input is glued to the keyboard.
         [self.view slk_animateLayoutIfNeededWithDuration:duration