Maintain local BOOLs for top view positions

Checking the topView frame relative to the resettedCenter was unreliable. It would not always reset to the same position. This caused the topView to anchor from the reset position while rotating.

Author: enriquez

ECSlidingViewController/Vendor/ECSlidingViewController/ECSlidingViewController.m

@@ -21,6 +21,9 @@ @interface ECSlidingViewController()
 @property (nonatomic, unsafe_unretained) CGFloat initialHoizontalCenter;
 @property (nonatomic, strong) UIPanGestureRecognizer *panGesture;
 @property (nonatomic, strong) UITapGestureRecognizer *resetTapGesture;
+@property (nonatomic, unsafe_unretained) BOOL underLeftShowing;
+@property (nonatomic, unsafe_unretained) BOOL underRightShowing;
+@property (nonatomic, unsafe_unretained) BOOL topViewIsOffScreen;
 
 - (NSUInteger)autoResizeToFillScreen;
 - (UIView *)topView;
@@ -81,6 +84,9 @@ @implementation ECSlidingViewController
 @synthesize initialHoizontalCenter;
 @synthesize panGesture = _panGesture;
 @synthesize resetTapGesture;
+@synthesize underLeftShowing   = _underLeftShowing;
+@synthesize underRightShowing  = _underRightShowing;
+@synthesize topViewIsOffScreen = _topViewIsOffScreen;
 
 - (void)setTopViewController:(UIViewController *)theTopViewController
 {
@@ -270,7 +276,7 @@ - (void)anchorTopViewTo:(ECSide)side animations:(void (^)())animations onComplet
     if (complete) {
       complete();
     }
-    
+    _topViewIsOffScreen = NO;
     [self addTopViewSnapshot];
     dispatch_async(dispatch_get_main_queue(), ^{
       NSString *key = (side == ECLeft) ? ECSlidingViewTopDidAnchorLeft : ECSlidingViewTopDidAnchorRight;
@@ -305,6 +311,7 @@ - (void)anchorTopViewOffScreenTo:(ECSide)side animations:(void(^)())animations o
     if (complete) {
       complete();
     }
+    _topViewIsOffScreen = YES;
     [self addTopViewSnapshot];
     dispatch_async(dispatch_get_main_queue(), ^{
       NSString *key = (side == ECLeft) ? ECSlidingViewTopDidAnchorLeft : ECSlidingViewTopDidAnchorRight;
@@ -333,21 +340,6 @@ - (void)resetTopViewWithAnimations:(void(^)())animations onComplete:(void(^)())c
   }];
 }
 
-- (BOOL)underLeftShowing
-{
-  return self.topView.frame.origin.x > 0;
-}
-
-- (BOOL)underRightShowing
-{
-  return self.topView.frame.origin.x < 0;
-}
-
-- (BOOL)topViewIsOffScreen
-{
-  return self.topView.center.x <= -self.resettedCenter + 1 || self.topView.center.x >= self.screenWidth + self.resettedCenter - 1;
-}
-
 - (NSUInteger)autoResizeToFillScreen
 {
   return (UIViewAutoresizingFlexibleWidth |
@@ -472,6 +464,8 @@ - (void)underLeftWillAppear
   [self.underLeftViewController viewWillAppear:NO];
   self.underLeftView.hidden = NO;
   [self updateUnderLeftLayout];
+  _underLeftShowing  = YES;
+  _underRightShowing = NO;
 }
 
 - (void)underRightWillAppear
@@ -483,6 +477,8 @@ - (void)underRightWillAppear
   [self.underRightViewController viewWillAppear:NO];
   self.underRightView.hidden = NO;
   [self updateUnderRightLayout];
+  _underLeftShowing  = NO;
+  _underRightShowing = YES;
 }
 
 - (void)topDidReset
@@ -493,6 +489,9 @@ - (void)topDidReset
   [self.topView removeGestureRecognizer:self.resetTapGesture];
   [self removeTopViewSnapshot];
   self.panGesture.enabled = YES;
+  _underLeftShowing   = NO;
+  _underRightShowing  = NO;
+  _topViewIsOffScreen = NO;
 }
 
 - (BOOL)topViewHasFocus