Charts/ChartsDemo-iOS/Objective-C/Demos/StackedBarChartViewController.m

//
//  StackedBarChartViewController.m
//  ChartsDemo
//
//  Copyright 2015 Daniel Cohen Gindi & Philipp Jahoda
//  A port of MPAndroidChart for iOS
//  Licensed under Apache License 2.0
//
//  https://github.com/danielgindi/Charts
//

#import "StackedBarChartViewController.h"
#import "ChartsDemo_iOS-Swift.h"

@interface StackedBarChartViewController () <ChartViewDelegate>

@property (nonatomic, strong) IBOutlet BarChartView *chartView;
@property (nonatomic, strong) IBOutlet UISlider *sliderX;
@property (nonatomic, strong) IBOutlet UISlider *sliderY;
@property (nonatomic, strong) IBOutlet UITextField *sliderTextX;
@property (nonatomic, strong) IBOutlet UITextField *sliderTextY;

@end

@implementation StackedBarChartViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.title = @"Stacked Bar Chart";
    
    self.options = @[
                     @{@"key": @"toggleValues", @"label": @"Toggle Values"},
                     @{@"key": @"toggleIcons", @"label": @"Toggle Icons"},
                     @{@"key": @"toggleHighlight", @"label": @"Toggle Highlight"},
                     @{@"key": @"animateX", @"label": @"Animate X"},
                     @{@"key": @"animateY", @"label": @"Animate Y"},
                     @{@"key": @"animateXY", @"label": @"Animate XY"},
                     @{@"key": @"saveToGallery", @"label": @"Save to Camera Roll"},
                     @{@"key": @"togglePinchZoom", @"label": @"Toggle PinchZoom"},
                     @{@"key": @"toggleAutoScaleMinMax", @"label": @"Toggle auto scale min/max"},
                     @{@"key": @"toggleData", @"label": @"Toggle Data"},
                     @{@"key": @"toggleBarBorders", @"label": @"Show Bar Borders"},
                    ];
    
    _chartView.delegate = self;
    
    _chartView.chartDescription.enabled = NO;
    
    _chartView.maxVisibleCount = 40;
    _chartView.pinchZoomEnabled = NO;
    _chartView.drawGridBackgroundEnabled = NO;
    _chartView.drawBarShadowEnabled = NO;
    _chartView.drawValueAboveBarEnabled = NO;
    _chartView.highlightFullBarEnabled = NO;
    
    NSNumberFormatter *leftAxisFormatter = [[NSNumberFormatter alloc] init];
    leftAxisFormatter.maximumFractionDigits = 1;
    leftAxisFormatter.negativeSuffix = @" $";
    leftAxisFormatter.positiveSuffix = @" $";

    ChartYAxis *leftAxis = _chartView.leftAxis;
    leftAxis.valueFormatter = [[ChartDefaultAxisValueFormatter alloc] initWithFormatter:leftAxisFormatter];
    leftAxis.axisMinimum = 0.0; // this replaces startAtZero = YES
    
    _chartView.rightAxis.enabled = NO;
    
    ChartXAxis *xAxis = _chartView.xAxis;
    xAxis.labelPosition = XAxisLabelPositionTop;
    
    ChartLegend *l = _chartView.legend;
    l.horizontalAlignment = ChartLegendHorizontalAlignmentRight;
    l.verticalAlignment = ChartLegendVerticalAlignmentBottom;
    l.orientation = ChartLegendOrientationHorizontal;
    l.drawInside = NO;
    l.form = ChartLegendFormSquare;
    l.formSize = 8.0;
    l.formToTextSpace = 4.0;
    l.xEntrySpace = 6.0;
    
    _sliderX.value = 12.0;
    _sliderY.value = 100.0;
    [self slidersValueChanged:nil];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)updateChartData
{
    if (self.shouldHideData)
    {
        _chartView.data = nil;
        return;
    }
    
    [self setDataCount:_sliderX.value + 1 range:_sliderY.value];
}

- (void)setDataCount:(int)count range:(double)range
{
    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    
    for (int i = 0; i < count; i++)
    {
        double mult = (range + 1);
        double val1 = (double) (arc4random_uniform(mult) + mult / 3);
        double val2 = (double) (arc4random_uniform(mult) + mult / 3);
        double val3 = (double) (arc4random_uniform(mult) + mult / 3);
        
        [yVals addObject:[[BarChartDataEntry alloc] initWithX:i yValues:@[@(val1), @(val2), @(val3)] icon: [UIImage imageNamed:@"icon"]]];
    }
    
    BarChartDataSet *set1 = nil;
    if (_chartView.data.dataSetCount > 0)
    {
        set1 = (BarChartDataSet *)_chartView.data.dataSets[0];
        [set1 replaceEntries: yVals];
        [_chartView.data notifyDataChanged];
        [_chartView notifyDataSetChanged];
    }
    else
    {
        set1 = [[BarChartDataSet alloc] initWithEntries:yVals label:@"Statistics Vienna 2014"];
        
        set1.drawIconsEnabled = NO;
        
        set1.colors = @[ChartColorTemplates.material[0], ChartColorTemplates.material[1], ChartColorTemplates.material[2]];
        set1.stackLabels = @[@"Births", @"Divorces", @"Marriages"];
        
        NSMutableArray *dataSets = [[NSMutableArray alloc] init];
        [dataSets addObject:set1];
        
        NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
        formatter.maximumFractionDigits = 1;
        formatter.negativeSuffix = @" $";
        formatter.positiveSuffix = @" $";
        
        BarChartData *data = [[BarChartData alloc] initWithDataSets:dataSets];
        [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:7.f]];
        [data setValueFormatter:[[ChartDefaultValueFormatter alloc] initWithFormatter:formatter]];
        [data setValueTextColor:UIColor.whiteColor];
        
        _chartView.fitBars = YES;
        _chartView.data = data;
    }
}

- (void)optionTapped:(NSString *)key
{
    [super handleOption:key forChartView:_chartView];
}

#pragma mark - Actions

- (IBAction)slidersValueChanged:(id)sender
{
    _sliderTextX.text = [@((int)_sliderX.value) stringValue];
    _sliderTextY.text = [@((int)_sliderY.value) stringValue];
    
    [self updateChartData];
}

#pragma mark - ChartViewDelegate

- (void)chartValueSelected:(ChartViewBase * __nonnull)chartView entry:(ChartDataEntry * __nonnull)entry highlight:(ChartHighlight * __nonnull)highlight
{
    NSLog(@"chartValueSelected, stack-index %ld", (long)highlight.stackIndex);
}

- (void)chartValueNothingSelected:(ChartViewBase * __nonnull)chartView
{
    NSLog(@"chartValueNothingSelected");
}

@end