Added UISegmentedControlNoSegment for selectedSegmentIndex property.

NYSegmentedControl.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "NYSegmentedControl"
-  s.version          = "1.0.7"
+  s.version          = "1.0.8"
   s.summary          = "Animated, customizable replacement for UISegmentedControl"
   s.description      = "NYSegmentedControl is a customizable, animated replacement for UISegmentedControl inspired by controls found in Instagram, Foursquare, and other apps."
   s.homepage         = "https://github.com/nealyoung/NYSegmentedControl"

NYSegmentedControl/NYSegmentedControl.h

@@ -142,7 +142,7 @@
 /**
  The index of the currently selected segment
  */
-@property (nonatomic) NSUInteger selectedSegmentIndex;
+@property (nonatomic) NSInteger selectedSegmentIndex;
 
 #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0
 
@@ -226,7 +226,7 @@
  @param selectedSegmentIndex The index of the segment to select. It must be a number between 0 and the number of segments (numberOfSegments) minus 1; values exceeding this upper range are pinned to it.
  @param animated Specify YES if the selected segment indicator should animate its position change.
  */
-- (void)setSelectedSegmentIndex:(NSUInteger)selectedSegmentIndex animated:(BOOL)animated;
+- (void)setSelectedSegmentIndex:(NSInteger)selectedSegmentIndex animated:(BOOL)animated;
 
 /**
  Reloads the control's items from its data source, if defined

NYSegmentedControl/NYSegmentedControl.m

@@ -18,7 +18,7 @@ @interface NYSegmentedControl ()
 @property NYSegmentIndicator *selectedSegmentIndicator;
 @property (nonatomic, getter=isAnimating) BOOL animating;
 
-- (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSUInteger)index animated:(BOOL)animated;
+- (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSInteger)index animated:(BOOL)animated;
 - (CGRect)indicatorFrameForSegment:(NYSegment *)segment;
 
 - (void)panGestureRecognized:(UIPanGestureRecognizer *)panGestureRecognizer;
@@ -188,7 +188,9 @@ - (void)layoutSubviews {
         }
     }
 
-    self.selectedSegmentIndicator.frame = [self indicatorFrameForSegment:self.segments[self.selectedSegmentIndex]];
+    if (self.selectedSegmentIndex != UISegmentedControlNoSegment) {
+        self.selectedSegmentIndicator.frame = [self indicatorFrameForSegment:self.segments[self.selectedSegmentIndex]];
+    }
 }
 
 - (void)drawRect:(CGRect)rect {
@@ -251,22 +253,32 @@ - (NSString *)titleForSegmentAtIndex:(NSUInteger)index {
     return segment.titleLabel.text;
 }
 
-- (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSUInteger)index animated:(BOOL)animated {
+- (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSInteger)index animated:(BOOL)animated {
+    if (index == UISegmentedControlNoSegment) {
+        //Hide segment indicator
+        self.selectedSegmentIndicator.hidden = YES;
+        return;
+    } else {
+        self.selectedSegmentIndicator.hidden = NO;
+    }
+
     NYSegment *selectedSegment = self.segments[index];
 
     // If we're moving the indicator back to the originally selected segment, don't change the segment's font style
     if (index != self.selectedSegmentIndex && self.stylesTitleForSelectedSegment) {
-        NYSegment *previousSegment = self.segments[self.selectedSegmentIndex];
-
-        [UIView transitionWithView:previousSegment.titleLabel
-                          duration:self.segmentIndicatorAnimationDuration
-                           options:UIViewAnimationOptionTransitionCrossDissolve
-                        animations:^{
-                            previousSegment.titleLabel.font = self.titleFont;
-                            previousSegment.titleLabel.textColor = self.titleTextColor;
-                            previousSegment.titleLabel.maskFrame = CGRectZero;
-                        }
-                        completion:nil];
+        if (self.selectedSegmentIndex != UISegmentedControlNoSegment) {
+            NYSegment *previousSegment = self.segments[self.selectedSegmentIndex];
+
+            [UIView transitionWithView:previousSegment.titleLabel
+                              duration:self.segmentIndicatorAnimationDuration
+                               options:UIViewAnimationOptionTransitionCrossDissolve
+                            animations:^{
+                                previousSegment.titleLabel.font = self.titleFont;
+                                previousSegment.titleLabel.textColor = self.titleTextColor;
+                                previousSegment.titleLabel.maskFrame = CGRectZero;
+                            }
+                            completion:nil];
+        }
 
         [UIView transitionWithView:selectedSegment.titleLabel
                           duration:self.segmentIndicatorAnimationDuration
@@ -282,6 +294,10 @@ - (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSUInteger)index animated:
                         completion:nil];
     }
 
+    if (_selectedSegmentIndex == UISegmentedControlNoSegment) {
+        self.selectedSegmentIndicator.frame = [self indicatorFrameForSegment:selectedSegment];
+    }
+
     if (animated) {
         void (^animationsBlock)(void) = ^{
             self.selectedSegmentIndicator.frame = [self indicatorFrameForSegment:selectedSegment];
@@ -295,6 +311,7 @@ - (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSUInteger)index animated:
             }
         };
 
+        [self.selectedSegmentIndicator setNeedsDisplay];
         if (NSFoundationVersionNumber <= NSFoundationVersionNumber_iOS_6_1 || !self.usesSpringAnimations) {
             [UIView animateWithDuration:self.segmentIndicatorAnimationDuration
                              animations:animationsBlock
@@ -309,6 +326,7 @@ - (void)moveSelectedSegmentIndicatorToSegmentAtIndex:(NSUInteger)index animated:
                              completion:nil];
         }
     } else {
+        [self.selectedSegmentIndicator setNeedsDisplay];
         self.selectedSegmentIndicator.frame = [self indicatorFrameForSegment:selectedSegment];
 
         if (self.stylesTitleForSelectedSegment) {
@@ -516,18 +534,26 @@ - (void)setSelectedTitleTextColor:(UIColor *)selectedTitleTextColor {
     [self setNeedsLayout];
 }
 
-- (void)setSelectedSegmentIndex:(NSUInteger)selectedSegmentIndex {
-    if (selectedSegmentIndex >= self.numberOfSegments) {
+- (void)setSelectedSegmentIndex:(NSInteger)selectedSegmentIndex {
+    if (selectedSegmentIndex >= (NSInteger)self.numberOfSegments) {
         selectedSegmentIndex = self.numberOfSegments - 1;
+    } else if (selectedSegmentIndex < 0) {
+        if (selectedSegmentIndex != UISegmentedControlNoSegment) {
+            selectedSegmentIndex = 0;
+        }
     }
 
     [self moveSelectedSegmentIndicatorToSegmentAtIndex:selectedSegmentIndex animated:NO];
     _selectedSegmentIndex = selectedSegmentIndex;
 }
 
-- (void)setSelectedSegmentIndex:(NSUInteger)selectedSegmentIndex animated:(BOOL)animated {
-    if (selectedSegmentIndex >= self.numberOfSegments) {
+- (void)setSelectedSegmentIndex:(NSInteger)selectedSegmentIndex animated:(BOOL)animated {
+    if (selectedSegmentIndex >= (NSInteger)self.numberOfSegments) {
         selectedSegmentIndex = self.numberOfSegments - 1;
+    } else if (selectedSegmentIndex < 0) {
+        if (selectedSegmentIndex != UISegmentedControlNoSegment) {
+            selectedSegmentIndex = 0;
+        }
     }
 
     [self moveSelectedSegmentIndicatorToSegmentAtIndex:selectedSegmentIndex animated:animated];

NYSegmentedControlDemo/NYSegmentedControlDemo/DemoViewController.m

@@ -86,6 +86,7 @@ - (void)viewDidLoad {
 #endif
     foursquareSegmentedControl.center = CGPointMake(lightControlExampleView.center.x, lightControlExampleView.center.y + 30.0f);
     foursquareSegmentedControlBackgroundView.center = foursquareSegmentedControl.center;
+    foursquareSegmentedControl.selectedSegmentIndex = UISegmentedControlNoSegment;
     [lightControlExampleView addSubview:foursquareSegmentedControl];
 
     UIView *darkControlExampleView = [[UIView alloc] initWithFrame:self.view.bounds];