Fix under navigation controller animations

Author: MrBendel

ECSlidingViewController/Vendor/ECSlidingViewController/ECSlidingViewController.m

@@ -130,8 +130,6 @@ - (void)setUnderLeftViewController:(UIViewController *)theUnderLeftViewControlle
     [self.underLeftViewController didMoveToParentViewController:self];
 
     [self updateUnderLeftLayout];
-    
-    [self.view insertSubview:_underLeftViewController.view atIndex:0];
   }
 }
 
@@ -148,8 +146,6 @@ - (void)setUnderRightViewController:(UIViewController *)theUnderRightViewControl
     [self.underRightViewController didMoveToParentViewController:self];
 
     [self updateUnderRightLayout];
-    
-    [self.view insertSubview:_underRightViewController.view atIndex:0];
   }
 }
 
@@ -530,9 +526,9 @@ - (void)underLeftWillAppear
   dispatch_async(dispatch_get_main_queue(), ^{
     [[NSNotificationCenter defaultCenter] postNotificationName:ECSlidingViewUnderLeftWillAppear object:self userInfo:nil];
   });
-  self.underRightView.hidden = YES;
+  [self.underRightView removeFromSuperview];
   [self.underLeftViewController viewWillAppear:NO];
-  self.underLeftView.hidden = NO;
+  [self.view insertSubview:self.underLeftView belowSubview:self.topView];
   [self updateUnderLeftLayout];
   _underLeftShowing  = YES;
   _underRightShowing = NO;
@@ -543,9 +539,9 @@ - (void)underRightWillAppear
   dispatch_async(dispatch_get_main_queue(), ^{
     [[NSNotificationCenter defaultCenter] postNotificationName:ECSlidingViewUnderRightWillAppear object:self userInfo:nil];
   });
-  self.underLeftView.hidden = YES;
+  [self.underLeftView removeFromSuperview];
   [self.underRightViewController viewWillAppear:NO];
-  self.underRightView.hidden = NO;
+  [self.view insertSubview:self.underRightView belowSubview:self.topView];
   [self updateUnderRightLayout];
   _underLeftShowing  = NO;
   _underRightShowing = YES;
@@ -559,6 +555,8 @@ - (void)topDidReset
   [self.topView removeGestureRecognizer:self.resetTapGesture];
   [self removeTopViewSnapshot];
   self.panGesture.enabled = YES;
+  [self.underRightView removeFromSuperview];
+  [self.underLeftView removeFromSuperview];
   _underLeftShowing   = NO;
   _underRightShowing  = NO;
   _topViewIsOffScreen = NO;