CorePlot bar graph not showing up - ios

Question

I have an implementation of CorePlot in my project and though I have no relevant errors or warnings in Xcode, have been unsuccessful in getting the plot to show up in the graph. The axis and chart show up fine, but no bars in the graph.
Any help or advice would be appreciated!
Header File
#import <UIKit/UIKit.h>
#import "PresentedViewControllerDelegate.h"
#import <CorePlot/ios/CorePlot.h>
#interface DeviceDetailModal : UIViewController <PresentedViewControllerDelegate, UIWebViewDelegate, UITableViewDataSource, UITableViewDelegate, CPTPlotDataSource,CPTBarPlotDelegate>{
CPTGraph *graph;
}
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#property (nonatomic, weak) id <PresentedViewControllerDelegate> delegate;
#property (strong,nonatomic) NSArray *dataSet;
#property (nonatomic, strong) CPTBarPlot *aaplPlot;
#property (nonatomic, strong) CPTPlotSpaceAnnotation *priceAnnotation;
#end
Main File
#import <Foundation/Foundation.h>
#import "DeviceDetailModal.h"
#import "DetailCell.h"
#import <CorePlot/ios/CorePlot.h>
#import "Constants.h"
#implementation DeviceDetailModal
NSString * const CPDTickerSymbolAAPL = #"AAPL";
CGFloat const CPDBarWidth = 0.25f;
CGFloat const CPDBarInitialX = 0.25f;
#synthesize aaplPlot = aaplPlot_;
-(void)viewDidLoad{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor colorWithRed:0.03 green:0.06 blue:0.10 alpha:1.0]];
UIBarButtonItem *closeButton = [[UIBarButtonItem alloc] initWithTitle:#"Close" style:UIBarButtonItemStylePlain target:self action:#selector(closeView)];
self.navigationItem.leftBarButtonItem = closeButton;
[[UIBarButtonItem appearance] setTintColor:[UIColor lightGrayColor]];
[[UINavigationBar appearance] setBarTintColor:[UIColor blackColor]];
self.tableView.layer.cornerRadius = 10.0;
self.tableView.layer.borderWidth = 0.7;
self.tableView.layer.borderColor = [UIColor whiteColor].CGColor;
self.tableView.opaque = NO;
self.tableView.backgroundColor = [UIColor clearColor];
self.tableView.backgroundView = nil;
self.dataSet = [[NSArray alloc] init];
self.dataSet = [NSArray arrayWithObjects:
[NSDecimalNumber numberWithFloat:571.70],
[NSDecimalNumber numberWithFloat:560.28],
[NSDecimalNumber numberWithFloat:610.00],
[NSDecimalNumber numberWithFloat:607.70],
[NSDecimalNumber numberWithFloat:603.00],
nil];
[self configureGraph];
[graph reloadData];
}
-(void)configureGraph {
CGRect hostingRect = CGRectMake(20, 350, 335, 310);
CPTGraphHostingView *hostingView = [[CPTGraphHostingView alloc] initWithFrame:hostingRect];
[self.view addSubview:hostingView];
[hostingView setBackgroundColor:[UIColor colorWithRed:0.03 green:0.06 blue:0.10 alpha:1.0]];
hostingView.layer.cornerRadius = 10.0;
hostingView.layer.borderWidth = 0.7;
hostingView.layer.borderColor = [UIColor whiteColor].CGColor;
graph = [[CPTXYGraph alloc] initWithFrame:hostingView.bounds];
hostingView.hostedGraph = graph;
[[graph defaultPlotSpace] setAllowsUserInteraction:TRUE];
// 1 - Create the graph
graph.plotAreaFrame.masksToBorder = NO;
// 2 - Configure the graph
//[graph applyTheme:[CPTTheme themeNamed:kCPTPlainBlackTheme]];
graph.paddingBottom = 30.0f;
graph.paddingLeft = 30.0f;
graph.paddingTop = -1.0f;
graph.paddingRight = -5.0f;
// 3 - Set up styles
CPTMutableTextStyle *titleStyle = [CPTMutableTextStyle textStyle];
titleStyle.color = [CPTColor whiteColor];
titleStyle.fontName = #"Helvetica-Bold";
titleStyle.fontSize = 16.0f;
// 4 - Set up title
NSString *title = #"Portfolio Prices: April 23 - 27, 2012";
graph.title = title;
graph.titleTextStyle = titleStyle;
graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;
graph.titleDisplacement = CGPointMake(0.0f, -16.0f);
// 5 - Set up plot space
CGFloat xMin = 0.0f;
CGFloat xMax = 7;
CGFloat yMin = 0.0f;
CGFloat yMax = 800.0f; // should determine dynamically based on max price
NSNumber *xAxisStart = [NSNumber numberWithFloat:xMin];
NSNumber *xAxisLength = [NSNumber numberWithDouble:xMax];
NSNumber *yAxisStart = [NSNumber numberWithFloat:yMin];
NSNumber *yAxisLength = [NSNumber numberWithDouble:yMax];
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:xAxisStart length:xAxisLength];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:yAxisStart length:yAxisLength];
// 1 - Set up the three plots
self.aaplPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor redColor] horizontalBars:NO];
self.aaplPlot.identifier = CPDTickerSymbolAAPL;
// 2 - Set up line style
CPTMutableLineStyle *barLineStyle = [[CPTMutableLineStyle alloc] init];
barLineStyle.lineColor = [CPTColor lightGrayColor];
barLineStyle.lineWidth = 0.5;
// 3 - Add plots to graph
graph = hostingView.hostedGraph;
CGFloat barX = CPDBarInitialX;
NSArray *plots = [NSArray arrayWithObjects:self.aaplPlot, nil];
for (CPTBarPlot *plot in plots) {
plot.dataSource = self;
plot.delegate = self;
plot.barWidth = [NSNumber numberWithFloat:CPDBarWidth];
plot.barOffset = [NSNumber numberWithFloat:barX];
plot.lineStyle = barLineStyle;
[graph addPlot:plot toPlotSpace:graph.defaultPlotSpace];
barX += CPDBarWidth;
}
// 1 - Configure styles
CPTMutableTextStyle *axisTitleStyle = [CPTMutableTextStyle textStyle];
axisTitleStyle.color = [CPTColor whiteColor];
axisTitleStyle.fontName = #"Helvetica-Bold";
axisTitleStyle.fontSize = 12.0f;
CPTMutableLineStyle *axisLineStyle = [CPTMutableLineStyle lineStyle];
axisLineStyle.lineWidth = 2.0f;
axisLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:1];
// 2 - Get the graph's axis set
CPTXYAxisSet *axisSet = (CPTXYAxisSet *) hostingView.hostedGraph.axisSet;
// 3 - Configure the x-axis
axisSet.xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
axisSet.xAxis.title = #"Days of Week (Mon - Fri)";
axisSet.xAxis.titleTextStyle = axisTitleStyle;
axisSet.xAxis.titleOffset = 10.0f;
axisSet.xAxis.axisLineStyle = axisLineStyle;
// 4 - Configure the y-axis
axisSet.yAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
axisSet.yAxis.title = #"Price";
axisSet.yAxis.titleTextStyle = axisTitleStyle;
axisSet.yAxis.titleOffset = 5.0f;
axisSet.yAxis.axisLineStyle = axisLineStyle;
}
#pragma mark - CPTPlotDataSource methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot {
return [self.dataSet count];
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index {
NSLog(#"DATA: %#",[self.dataSet objectAtIndex:index]);
return [self.dataSet objectAtIndex:index];
}
#pragma mark - CPTBarPlotDelegate methods
-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index {
// 1 - Is the plot hidden?
if (plot.isHidden == YES) {
return;
}
// 2 - Create style, if necessary
static CPTMutableTextStyle *style = nil;
if (!style) {
style = [CPTMutableTextStyle textStyle];
style.color= [CPTColor yellowColor];
style.fontSize = 16.0f;
style.fontName = #"Helvetica-Bold";
}
// 3 - Create annotation, if necessary
NSNumber *price = [self numberForPlot:plot field:CPTBarPlotFieldBarTip recordIndex:index];
if (!self.priceAnnotation) {
NSNumber *x = [NSNumber numberWithInt:0];
NSNumber *y = [NSNumber numberWithInt:0];
NSArray *anchorPoint = [NSArray arrayWithObjects:x, y, nil];
self.priceAnnotation = [[CPTPlotSpaceAnnotation alloc] initWithPlotSpace:plot.plotSpace anchorPlotPoint:anchorPoint];
}
// 4 - Create number formatter, if needed
static NSNumberFormatter *formatter = nil;
if (!formatter) {
formatter = [[NSNumberFormatter alloc] init];
[formatter setMaximumFractionDigits:2];
}
// 5 - Create text layer for annotation
NSString *priceValue = [formatter stringFromNumber:price];
CPTTextLayer *textLayer = [[CPTTextLayer alloc] initWithText:priceValue style:style];
self.priceAnnotation.contentLayer = textLayer;
// 6 - Get plot index based on identifier
NSInteger plotIndex = 0;
if ([plot.identifier isEqual:CPDTickerSymbolAAPL] == YES) {
plotIndex = 0;
}
// 7 - Get the anchor point for annotation
CGFloat x = index + CPDBarInitialX + (plotIndex * CPDBarWidth);
NSNumber *anchorX = [NSNumber numberWithFloat:x];
CGFloat y = [price floatValue] + 40.0f;
NSNumber *anchorY = [NSNumber numberWithFloat:y];
self.priceAnnotation.anchorPlotPoint = [NSArray arrayWithObjects:anchorX, anchorY, nil];
// 8 - Add the annotation
[plot.graph.plotAreaFrame.plotArea addAnnotation:self.priceAnnotation];
}
#end

Answer 1

Plot ranges are given as a starting location and length. In your case, make the starting location the min value and the length max - min. Right now it's ok since the min is zero, but the length will be wrong if you ever change the min values.
The -numberForPlot:field:recordIndex: datasource method must check the field parameter and return the correct value for the field. Return the index parameter value for the CPTBarPlotFieldBarLocation field. Return the value from the dataSet array for the CPTBarPlotFieldBarTip field.