axisMaximum & labelCount ot effective

[taojeff]

@implementation LineChart1ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.title = @"Line Chart 1";
    
    self.options = @[
                     @{@"key": @"toggleValues", @"label": @"Toggle Values"},
                     @{@"key": @"toggleFilled", @"label": @"Toggle Filled"},
                     @{@"key": @"toggleCircles", @"label": @"Toggle Circles"},
                     @{@"key": @"toggleCubic", @"label": @"Toggle Cubic"},
                     @{@"key": @"toggleHorizontalCubic", @"label": @"Toggle Horizontal Cubic"},
                     @{@"key": @"toggleIcons", @"label": @"Toggle Icons"},
                     @{@"key": @"toggleStepped", @"label": @"Toggle Stepped"},
                     @{@"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"},
                     ];
    
    NSArray *xLabels = @[@"00:00", @"06:00", @"12:00", @"18:00", @"00:00"];
    NSArray *yValues = @[
        @65, @50, @80, @60, @75, @75,
        @65, @50, @80, @60, @75, @75,
        @65, @50, @80, @60, @75, @75,
        @65, @50, @80, @60, @75, @75
    ];
    NSMutableArray<ChartDataEntry *> *entries = [NSMutableArray array];
    for (int i = 0; i < yValues.count; i++) {
        [entries addObject:[[ChartDataEntry alloc] initWithX:i y:[yValues[i] doubleValue]]];
    }
    CGRect frame = _chartView.frame;
    frame.size = CGSizeMake([UIScreen mainScreen].bounds.size.width, 300);
    _chartView.frame = frame;
    _chartView.delegate = self;
    _chartView.chartDescription.enabled = NO;
    _chartView.dragEnabled = YES;
    [_chartView setScaleEnabled:NO];
    _chartView.pinchZoomEnabled = YES;
    _chartView.drawGridBackgroundEnabled = NO;
    _chartView.drawBordersEnabled = NO;
    _chartView.legend.enabled = NO;
    _chartView.xAxis.gridLineDashLengths = @[@5.f, @5.f];
    _chartView.xAxis.labelTextColor = UIColor.redColor;
    _chartView.xAxis.labelFont = [UIFont systemFontOfSize:16.f];
    _chartView.xAxis.labelPosition = XAxisLabelPositionBottom;
    _chartView.xAxis.granularity = 1;
    _chartView.xAxis.labelCount = 5;
    _chartView.xAxis.axisMinimum = 0;
    _chartView.xAxis.axisMaximum = 23.999;
    _chartView.xAxis.spaceMin = 0;
    _chartView.xAxis.spaceMax = 0;
    _chartView.extraLeftOffset = 30;
    _chartView.xAxis.valueFormatter = [[CustomAxisValueFormatter alloc] initWithLabels:xLabels];
    LineChartDataSet *dataSet = [[LineChartDataSet alloc] initWithEntries:entries];
    dataSet.drawIconsEnabled = NO;
    [dataSet setColor:UIColor.redColor];
    dataSet.lineWidth = 2.0;
    dataSet.drawCircleHoleEnabled = NO;
    dataSet.drawCirclesEnabled = NO;
    dataSet.drawValuesEnabled = NO;
    dataSet.mode = LineChartModeHorizontalBezier;
    
    NSArray *gradientColors = @[
        (id)[ChartColorTemplates colorFromString:@"#00FFC4C8"].CGColor,
        (id)[ChartColorTemplates colorFromString:@"#4DFFC4C8"].CGColor
    ];
    CGGradientRef gradient = CGGradientCreateWithColors(nil, (CFArrayRef)gradientColors, nil);
    dataSet.fillAlpha = 1.f;
    dataSet.fill = [[ChartLinearGradientFill alloc] initWithGradient:gradient angle:90.0f];
    dataSet.drawFilledEnabled = YES;
    CGGradientRelease(gradient);
    LineChartData *data = [[LineChartData alloc] initWithDataSets:@[dataSet]];
    _chartView.data = data;
    
    ChartYAxis *rightAxis = _chartView.rightAxis;
    [rightAxis removeAllLimitLines];
    rightAxis.axisMaximum = 100.0;
    rightAxis.axisMinimum = 0.0;
    rightAxis.gridLineDashLengths = @[@5.f, @5.f];
    rightAxis.drawZeroLineEnabled = NO;
    rightAxis.axisLineDashLengths = @[@5.f, @5.f];
    rightAxis.labelFont = [UIFont systemFontOfSize:16.f];
    rightAxis.labelTextColor = UIColor.redColor;
    rightAxis.drawLimitLinesBehindDataEnabled = YES;
    
    _chartView.leftAxis.enabled = NO;
    
    BalloonMarker *marker = [[BalloonMarker alloc]
                             initWithColor: [UIColor blueColor]
                             font: [UIFont systemFontOfSize:12.0]
                             textColor: UIColor.whiteColor
                             insets: UIEdgeInsetsMake(8.0, 8.0, 20.0, 8.0)];
    
    marker.chartView = _chartView;
    marker.minimumSize = CGSizeMake(80.f, 40.f);
    _chartView.marker = marker;
    
    [_chartView animateWithXAxisDuration:0];
}

#pragma mark - ChartViewDelegate

- (void)chartValueSelected:(ChartViewBase * __nonnull)chartView entry:(ChartDataEntry * __nonnull)entry highlight:(ChartHighlight * __nonnull)highlight
{
    NSLog(@"chartValueSelected");
}

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

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

@end

@interface CustomAxisValueFormatter ()
@property (nonatomic, strong) NSArray<NSString *> *timeLabels;
@end

@implementation CustomAxisValueFormatter

- (instancetype)initWithLabels:(NSArray<NSString *> *)labels {
    if (self = [super init]) {
        self.timeLabels = labels;
    }
    return self;
}

- (NSString *)stringForValue:(double)value axis:(ChartAxisBase *)axis {
    NSInteger index = (NSInteger)round(value / 6.0); // 每6小时一个
    if (index >= 0 && index < self.timeLabels.count) {
        return self.timeLabels[index];
    }
    return @"111";
}

@end 

- (NSString *)stringForValue:(double)value axis:(ChartAxisBase *)axis {
    NSInteger index = (NSInteger)round(value / 6.0); // 每6小时一个
    if (index >= 0 && index < self.timeLabels.count) {
        return self.timeLabels[index];
    }
    return @"111";
}

How to display one label every 6 hours and remove the extra spaces on the right side?

[taojeff]

• (NSString *)stringForValue:(double)value axis:(ChartAxisBase *)axis；
  print value