Add sticky offset

TLYShyNavBar/ShyControllers/TLYShyViewController.h

@@ -39,6 +39,11 @@ typedef CGFloat(^TLYShyViewControllerContractionAmountBlock)(UIView *view);
 
 @property (nonatomic) TLYShyNavBarFade fadeBehavior;
 
+/* Additional sticky offset for extension view,
+ * usable to make only part of extension view visible in folded state.
+ */
+@property (nonatomic) CGFloat stickyOffset;
+
 /* Sticky means it will always stay in expanded state
  */
 @property (nonatomic) BOOL sticky;

TLYShyNavBar/ShyControllers/TLYShyViewController.m

@@ -61,7 +61,7 @@ - (CGPoint)expandedCenterValue
 
 - (CGFloat)contractionAmountValue
 {
-    return self.sticky ? 0.f : CGRectGetHeight(self.view.bounds);
+    return (self.sticky ? 0.f : CGRectGetHeight(self.view.bounds)) - self.stickyOffset;
 }
 
 - (CGPoint)contractedCenterValue
@@ -83,7 +83,7 @@ - (BOOL)expanded
 
 - (void)_onAlphaUpdate:(CGFloat)alpha
 {
-    if (self.sticky)
+    if (self.sticky || self.stickyOffset > FLT_EPSILON)
     {
         self.view.alpha = 1.f;
         [self _updateSubviewsAlpha:1.f];
@@ -169,7 +169,7 @@ - (CGFloat)updateYOffset:(CGFloat)deltaY
         CGFloat newYCenter = MAX(MIN(self.expandedCenterValue.y, newYOffset), self.contractedCenterValue.y);
 
         [self _updateCenter:CGPointMake(self.expandedCenterValue.x, newYCenter)];
-        
+
         CGFloat newAlpha = 1.f - (self.expandedCenterValue.y - self.view.center.y) / self.contractionAmountValue;
         newAlpha = MIN(MAX(FLT_EPSILON, newAlpha), 1.f);
 
@@ -178,7 +178,7 @@ - (CGFloat)updateYOffset:(CGFloat)deltaY
         residual = newYOffset - newYCenter;
 
         // QUICK FIX: Only the extensionView is hidden
-        if (!self.subShyController)
+        if (!self.subShyController && self.stickyOffset <= FLT_EPSILON)
         {
             self.view.hidden = residual < 0;
         }

TLYShyNavBar/TLYShyNavBarManager.h

@@ -56,6 +56,11 @@
  */
 @property (nonatomic) BOOL stickyExtensionView;
 
+/* Additional sticky offset for extension view,
+ * usable to make only part of extension view visible in folded state.
+ */
+@property (nonatomic) CGFloat stickyOffset;
+
 /* Control the resistance when scrolling up/down before the navbar
  * expands/contracts again.
  */

TLYShyNavBar/TLYShyNavBarManager.m

@@ -225,6 +225,16 @@ - (BOOL)stickyExtensionView
     return self.extensionController.sticky;
 }
 
+- (CGFloat)stickyOffset
+{
+    return self.extensionController.stickyOffset;
+}
+
+- (void)setStickyOffset:(CGFloat)stickyOffset
+{
+    self.extensionController.stickyOffset = stickyOffset;
+}
+
 - (void)setStickyExtensionView:(BOOL)stickyExtensionView
 {
     self.extensionController.sticky = stickyExtensionView;

TLYShyNavBarDemo/TLYShyNavBarDemo/Base.lproj/Main.storyboard

@@ -55,6 +55,11 @@
                         </constraints>
                     </view>
                     <navigationItem key="navigationItem" id="vR6-NW-SQ1"/>
+                    <userDefinedRuntimeAttributes>
+                        <userDefinedRuntimeAttribute type="number" keyPath="stickyOffset">
+                            <real key="value" value="10"/>
+                        </userDefinedRuntimeAttribute>
+                    </userDefinedRuntimeAttributes>
                     <connections>
                         <outlet property="imageView" destination="RWp-Z1-nNI" id="6fW-pD-yc1"/>
                         <outlet property="scrollView" destination="d0u-JZ-WMw" id="BVu-7c-4oX"/>

TLYShyNavBarDemo/TLYShyNavBarDemo/TLYViewController.m

@@ -13,6 +13,7 @@ @interface TLYViewController ()
 @property (nonatomic, assign) IBInspectable BOOL disableExtensionView;
 @property (nonatomic, assign) IBInspectable BOOL stickyNavigationBar;
 @property (nonatomic, assign) IBInspectable BOOL stickyExtensionView;
+@property (nonatomic, assign) IBInspectable CGFloat   stickyOffset;
 @property (nonatomic, assign) IBInspectable NSInteger fadeBehavior;
 
 @property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
@@ -32,6 +33,7 @@ - (id)initWithCoder:(NSCoder *)aDecoder
         self.disableExtensionView = NO;
         self.stickyNavigationBar = NO;
         self.stickyExtensionView = NO;
+        self.stickyOffset = 0.f;
         self.fadeBehavior = TLYShyNavBarFadeSubviews;
 
         self.title = @"WTFox Say";
@@ -70,6 +72,8 @@ - (void)viewDidLoad
     [self.shyNavBarManager setStickyExtensionView:self.stickyExtensionView];
     /* Navigation bar fade behavior */
     [self.shyNavBarManager setFadeBehavior:self.fadeBehavior];
+    /* Show sticky offset */
+    [self.shyNavBarManager setStickyOffset:self.stickyOffset];
 }
 
 - (void)viewDidLayoutSubviews