Fix container height while using minimum height with parallax header.

Fix example.

Example/MXSegmentedPager/Base.lproj/Main_iPhone.storyboard

@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6254" systemVersion="14C109" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="o9c-rq-WX6">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6751" systemVersion="14C1510" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="o9c-rq-WX6">
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6247"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6736"/>
     </dependencies>
     <scenes>
         <!--Root View Controller-->
         <scene sceneID="xN4-dL-yXS">
             <objects>
                 <tableViewController id="FJE-cX-rWX" customClass="MXMenuViewController" sceneMemberID="viewController">
                     <tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="22" sectionFooterHeight="22" id="pjH-Pf-vM2">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
+                        <rect key="frame" x="0.0" y="64" width="320" height="568"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                         <connections>
@@ -27,10 +27,12 @@
         <!--Navigation Controller-->
         <scene sceneID="J4n-66-rW8">
             <objects>
-                <navigationController id="o9c-rq-WX6" sceneMemberID="viewController">
-                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="l1S-Xk-xhx">
+                <navigationController automaticallyAdjustsScrollViewInsets="NO" id="o9c-rq-WX6" sceneMemberID="viewController">
+                    <navigationBar key="navigationBar" opaque="NO" contentMode="scaleToFill" id="l1S-Xk-xhx">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
                         <autoresizingMask key="autoresizingMask"/>
+                        <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
+                        <color key="tintColor" cocoaTouchSystemColor="darkTextColor"/>
                     </navigationBar>
                     <connections>
                         <segue destination="FJE-cX-rWX" kind="relationship" relationship="rootViewController" id="Rb0-mr-dtc"/>

Example/MXSegmentedPager/MXParallaxViewController.m

@@ -23,6 +23,11 @@ - (void)viewDidLoad
 {
     [super viewDidLoad];
 
+    [self.navigationController.navigationBar setBackgroundImage:[UIImage new]
+                             forBarMetrics:UIBarMetricsDefault];
+    self.navigationController.navigationBar.shadowImage = [UIImage new];
+    self.automaticallyAdjustsScrollViewInsets = NO;
+
     // Setup the segmented pager properties
     self.segmentedPager.delegate = self;
     self.segmentedPager.dataSource = self;
@@ -52,7 +57,10 @@ - (MXSegmentedPager *)segmentedPager {
     if (!_segmentedPager) {
 
         // Set a segmented pager below the cover
-        _segmentedPager = [[MXSegmentedPager alloc] initWithFrame:self.view.frame];
+        _segmentedPager = [[MXSegmentedPager alloc] initWithFrame:(CGRect){
+            .origin = CGPointZero,
+            .size   = self.view.frame.size
+        }];
     }
     return _segmentedPager;
 }

Pod/Classes/MXSegmentedPager+ParallaxHeader.m

@@ -86,7 +86,6 @@ - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
             return NO;
         }
     }
-
     return YES;
 }
 
@@ -119,6 +118,8 @@ @interface MXSegmentedPager ()
 
 @implementation MXSegmentedPager (ParallaxHeader)
 
+static NSString* const kContaineFrameKeyPath = @"container.frame";
+
 - (void)setParallaxHeaderView:(UIView *)view mode:(VGParallaxHeaderMode)mode height:(CGFloat)height {
 
     self.scrollView = [[MXScrollView alloc] initWithFrame:(CGRect){
@@ -130,6 +131,9 @@ - (void)setParallaxHeaderView:(UIView *)view mode:(VGParallaxHeaderMode)mode hei
     self.scrollView.contentSize = CGSizeMake(self.frame.size.width, self.frame.size.height + height);
     [self.scrollView setParallaxHeaderView:view mode:mode height:height];
     [self addSubview:self.scrollView];
+
+    //I'm not a big fan of KVO but its the only way I found to subtract minimum height to container frame.
+    [self addObserver:self forKeyPath:kContaineFrameKeyPath options:NSKeyValueObservingOptionNew context:nil];
 }
 
 #pragma mark Properties
@@ -162,4 +166,23 @@ - (void)setProgressBlock:(MXProgressBlock)progressBlock {
     self.scrollView.progressBlock = progressBlock;
 }
 
+#pragma mark KVO 
+
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
+    if (object == self && [keyPath isEqualToString:kContaineFrameKeyPath]) {
+        [self removeObserver:self forKeyPath:kContaineFrameKeyPath];
+
+        self.container.frame = (CGRect){
+            .origin         = self.container.frame.origin,
+            .size.width     = self.container.frame.size.width,
+            .size.height    = self.container.frame.size.height - self.scrollView.minimumHeigth
+        };
+
+        [self addObserver:self forKeyPath:kContaineFrameKeyPath options:NSKeyValueObservingOptionNew context:nil];
+    }
+    else {
+        [super observeValueForKeyPath:keyPath ofObject:object change:change context:nil];
+    }
+}
+
 @end

Pod/Classes/MXSegmentedPager.h

@@ -146,7 +146,7 @@
 /**
  The pages container size. Use this property to set up your pages frame.
  */
-@property (nonatomic, readwrite) CGSize containerSize;
+@property (nonatomic, assign) CGSize containerSize;
 
 /**
  Reloads everything from scratch. redisplays pages in container.

Pod/Classes/MXSegmentedPager.m

@@ -126,6 +126,13 @@ - (CGSize)containerSize {
     return self.container.frame.size;
 }
 
+- (void)setContainerSize:(CGSize)containerSize {
+    self.container.frame = (CGRect){
+        .origin = self.container.frame.origin,
+        .size   = containerSize
+    };
+}
+
 #pragma mark HMSegmentedControl target
 
 - (void)pageControlValueChanged:(HMSegmentedControl*)segmentedControl {
@@ -196,10 +203,10 @@ - (void)layoutContainer {
         UIView* view = [self.pages objectAtIndex:index];
         [self.container addSubview:view];
 
-        CGRect frame = (CGRect) {
-            .origin.x = width,
-            .origin.y = view.frame.origin.y,
-            .size = view.frame.size
+        CGRect frame = (CGRect){
+            .origin.x   = width,
+            .origin.y   = 0.f,
+            .size       = self.containerSize
         };
         view.frame = frame;
         width += self.frame.size.width;
@@ -213,17 +220,17 @@ - (void)layoutContainer {
 
 - (void) layoutWithHeight:(CGFloat)height {
     CGRect subFrame = (CGRect) {
-        .origin = CGPointZero,
-        .size.width = self.frame.size.width,
-        .size.height = height
+        .origin         = CGPointZero,
+        .size.width     = self.frame.size.width,
+        .size.height    = height
     };
     self.segmentedControl.frame = subFrame;
 
     subFrame = (CGRect) {
-        .origin.x = 0.f,
-        .origin.y = height,
-        .size.width = self.frame.size.width,
-        .size.height = self.frame.size.height - height
+        .origin.x       = 0.f,
+        .origin.y       = height,
+        .size.width     = self.frame.size.width,
+        .size.height    = self.frame.size.height - height
     };
     self.container.frame = subFrame;
 }