Added a continuous block callback to sliding

Author: zdavison

ECSlidingViewController/SecondTopViewController.m

@@ -20,6 +20,10 @@ - (void)viewWillAppear:(BOOL)animated
   self.slidingViewController.underRightViewController = nil;
 
   [self.view addGestureRecognizer:self.slidingViewController.panGesture];
+    
+  self.slidingViewController.continuousBlock = ^(float x){
+    self.view.backgroundColor = [UIColor colorWithRed:x/self.view.bounds.size.width green:50 blue:70 alpha:1];
+  };
 }
 
 - (IBAction)revealMenu:(id)sender

ECSlidingViewController/Vendor/ECSlidingViewController/ECSlidingViewController.h

@@ -165,6 +165,13 @@ typedef enum {
  */
 @property (nonatomic, assign) NSUInteger panningVelocityXThreshold;
 
+/** Can be set to provide a continuous callback as the top view slides.
+ 
+ Useful for animations synchronized to the sliding.
+ 
+ */
+@property (nonatomic,copy) void (^continuousBlock)(float xPos);
+
 /** Returns a horizontal panning gesture for moving the top view.
  
  This is typically added to the top view or a top view's navigation bar.

ECSlidingViewController/Vendor/ECSlidingViewController/ECSlidingViewController.m

@@ -250,6 +250,9 @@ - (void)updateTopViewHorizontalCenterWithRecognizer:(UIPanGestureRecognizer *)re
 {
   CGPoint currentTouchPoint     = [recognizer locationInView:self.view];
   CGFloat currentTouchPositionX = currentTouchPoint.x;
+    
+  if(self.continuousBlock)
+    self.continuousBlock(currentTouchPositionX);
 
   if (recognizer.state == UIGestureRecognizerStateBegan) {
     self.initialTouchPositionX = currentTouchPositionX;