I made some change. Please review whether the change is suitable.

Classes/JCStockGraphController.h

@@ -10,11 +10,11 @@
 #import "CorePlot-CocoaTouch.h"
 
 typedef enum {
-    kGraphRange5Year = 0,
-    kGraphRange1Year,
-    kGraphRange3Month,
+    kGraphRange1Week = 0,
     kGraphRange1Month,
-    kGraphRange1Week,
+    kGraphRange3Month,
+    kGraphRange1Year,
+    kGraphRange5Year,
     kGraphRangeCount
 } JCStockGraphRange;
 
@@ -38,12 +38,15 @@ typedef NSInteger JCStockGraphOptionMask;
 @property (nonatomic) JCStockGraphRange range;
 @property (nonatomic) CGPoint graphOffset;
 @property (nonatomic) CGSize graphSize;
+@property (nonatomic) id parentPage;
 
 @property (strong, nonatomic) NSString *ticker;
 @property (strong, nonatomic) JCStockGraphView *graphView;
 
-- (id)initWithTicker:(NSString *)ticker;
+- (id)initWithTicker:(NSString *)ticker parent:(id)qParent;
 - (void)loadDataWithCompletion:(void (^)())completion;
 - (void)reloadGraph;
 
+- (void)releaseGraph;
+
 @end

Classes/JCStockGraphController.m

@@ -21,14 +21,14 @@ @interface JCStockGraphController () {
     NSArray *points;
     BOOL loaded;
     BOOL hasSetSize;
-    UITapGestureRecognizer *tapRecognizer;
+//    UITapGestureRecognizer *tapRecognizer;
 }
 @end
 
 
 @implementation JCStockGraphController
 
-- (id)initWithTicker:(NSString *)ticker
+- (id)initWithTicker:(NSString *)ticker parent:(id)qParent
 {
     self = [super init];
     if (self) {
@@ -37,6 +37,7 @@ - (id)initWithTicker:(NSString *)ticker
         self.range        = kGraphRange5Year;
         self.graphOffset  = CGPointZero;
         self.graphSize    = CGSizeZero;
+        self.parentPage = qParent;
     }
     return self;
 }
@@ -71,7 +72,7 @@ - (void)loadDataWithCompletion:(void (^)())completion
 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
 
-        [[JCStockPriceStore sharedInstance] getDataForTicker:self.ticker withProgress:^(double progress) {
+        [[JCStockPriceStore sharedInstance] getDataForTicker:self.ticker parentPage:self.parentPage withProgress:^(double progress) {
              hud.progress = progress;
 
         } completion:^(NSArray *newPoints) {
@@ -105,7 +106,7 @@ -(void)loadGraph
     (self.graphOptions & kGraphOptionHideYAxis) ? [self.graphView hideYAxis] : [self.graphView configureYAxisWithPoints:points];
     if (!(self.graphOptions & kGraphOptionHideGrid)) [self.graphView configureGridLines];
     if (!(self.graphOptions & kGraphOptionHideRangeLabel)) [self.graphView addRangeLabel];
-    self.graphView.userInteractionEnabled = (self.graphOptions & kGraphOptionInteractive);
+    self.graphView.userInteractionEnabled = (BOOL) (self.graphOptions & kGraphOptionInteractive);
 
     [self.view addSubview:self.graphView];
 }
@@ -117,6 +118,12 @@ - (void)reloadGraph
     [self.graphView reloadGraph];
 }
 
+- (void)releaseGraph
+{
+    [self.graphView removePlots];
+    self.graphView = nil;
+}
+
 - (NSArray *)thinPoints:(NSArray *)fullPoints
 {
     //Make graph look smoother by thinning out the number of data points

Classes/JCStockGraphPageController.m

@@ -45,6 +45,19 @@ - (void)viewWillAppear:(BOOL)animated
     [self reloadViews];
 }
 
+- (void)viewDidDisappear:(BOOL)animated
+{
+    [super viewDidDisappear:animated];
+    if (graphControllers!=nil)
+    {
+        for (JCStockGraphController *gc in graphControllers)
+        {
+            [gc releaseGraph];
+            [gc removeFromParentViewController];
+        }
+    }
+}
+
 - (void)reloadViews
 {
     if (pagingScrollView) {
@@ -76,7 +89,7 @@ - (void)loadRemainingPages
         return;
     }
 
-    JCStockGraphController *graphController = [[JCStockGraphController alloc] initWithTicker:self.ticker];
+    JCStockGraphController *graphController = [[JCStockGraphController alloc] initWithTicker:self.ticker parent:self];
     //graphController.view.frame            = self.view.bounds;
     graphController.graphOffset             = self.graphOffset;
     graphController.graphSize               = self.graphSize;

Classes/JCStockGraphView.h

@@ -7,7 +7,8 @@
 //
 
 #import <UIKit/UIKit.h>
-#import "CorePlot/CorePlot-CocoaTouch.h"
+//#import "CorePlot/CorePlot-CocoaTouch.h"
+#import "CorePlot-CocoaTouch.h"
 #import "JCStockGraphController.h"
 
 @class JCStockPriceStore;
@@ -30,4 +31,6 @@
 - (void)hideYAxis;
 - (void)addRangeLabel;
 
+-(void)removePlots;
+
 @end

Classes/JCStockGraphView.m

@@ -23,6 +23,21 @@ - (void)reloadGraph
     [self.hostView.hostedGraph reloadData];
 }
 
+#pragma mark - some release handle
+-(void)removePlots
+{
+    for (CPTPlot* plot in [self.hostView.hostedGraph allPlots])
+    {
+        plot.dataSource = nil;
+        plot.delegate = nil;
+        [plot deleteDataInIndexRange:NSMakeRange(0, plot.cachedDataCount)];
+        [self.hostView.hostedGraph removePlot:plot];
+    }
+    [self.hostView removeFromSuperview];
+    self.hostView = nil;
+}
+
+
 #pragma mark - Chart behavior
 
 -(void)configureHost
@@ -83,7 +98,9 @@ -(void)configurePlotWithDataSource:(id<CPTPlotDataSource>)dataSource
 - (void)configureXAxisWithPoints:(NSArray *)points delegate:(id<CPTAxisDelegate>)delegate
 {
     // 0 - increase padding to make room for axis labels
-    self.hostView.hostedGraph.plotAreaFrame.paddingBottom = 24;
+    self.hostView.hostedGraph.plotAreaFrame.paddingBottom = 20;
+    self.hostView.hostedGraph.plotAreaFrame.paddingRight = 20;
+    self.hostView.hostedGraph.plotAreaFrame.paddingTop = 6;
 
 	// 1 - Get axis set
 	CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.hostView.hostedGraph.axisSet;
@@ -115,6 +132,7 @@ - (void)configureYAxisWithPoints:(NSArray *)points
     priceFormatter.numberStyle              = kCFNumberFormatterCurrencyStyle;
     priceFormatter.maximumSignificantDigits = 3;
     priceFormatter.usesSignificantDigits    = YES;
+    priceFormatter.currencySymbol = @"$";
 
     CPTXYAxis *y         = axisSet.yAxis;
     y.axisConstraints    = [CPTConstraints constraintWithLowerOffset:0];
@@ -194,7 +212,7 @@ - (void)addRangeLabel
     rangeLabel.backgroundColor  = [UIColor colorWithWhite:0.0 alpha:0.4];
     [rangeLabel sizeToFit];
     rangeLabel.width            += 8;
-    rangeLabel.y                = self.height - rangeLabel.height;
+    rangeLabel.y                = self.height + 4; // - rangeLabel.height;
     rangeLabel.right            = self.right;
     rangeLabel.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleLeftMargin;
     [self addSubview:rangeLabel];

Classes/JCStockPriceStore.h

@@ -13,7 +13,7 @@
 + (JCStockPriceStore *)sharedInstance;
 
 ///@return YES if we loaded data from the cache/memory, NO if we made a request for the data
-- (BOOL)getDataForTicker:(NSString *)ticker withProgress:(void (^)(double progress))progBlock completion:(void (^)(NSArray *points))block;
+- (BOOL)getDataForTicker:(NSString *)ticker parentPage:(id)qParent withProgress:(void (^)(double progress))progBlock completion:(void (^)(NSArray *points))block;
 
 @property (nonatomic) BOOL diskCachingEnabled;
 @property (nonatomic) BOOL memoryCachingEnabled;