Ios 如何在CPTSatterPlot图形的x轴上显示自定义对象

我已经在y轴上实现了自定义对象（来自webservices），从y轴上的y正交40开始，在y轴上间隔20，并且其工作正常。 目前，我们在x轴上显示的时间间隔为1天。但现在我想显示定制对象（即日期，但有可能在同一日期的两个不同时间发生）（来自webservices），间隔为20，就像在y轴上一样。 我尝试了类似于y轴的方法，但没有成功。所有值均以单个位置显示，但不是以20为间隔显示。 服务器响应示例如下所示，仅适用于x轴。 例如：-

{
      date : “2015-12-25 6:30:00”,
      date : “2015-12-30 14:00:00”,
      date : “2016-01-25 5:30:00”,
      date : “2016-01-25 7:00:00”,
      date : “2016-01-10 10:00:00”,
      date : “2016-01-10 12:30:00”,
      date : “2016-01-11 11:00:00”,
      date : “2016-01-12 16:30:00”
}

这是我的代码：

-(void)reloadData
{
    if ( !self.graph ) {
        CPTXYGraph *newGraph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
        self.graph = newGraph;

        newGraph.paddingTop    = 0.0;
        newGraph.paddingBottom = 0.0;
        newGraph.paddingLeft   = 0.0;
        newGraph.paddingRight  = 0.0;


        self.graph.plotAreaFrame.paddingTop = 2.0f;
        self.graph.plotAreaFrame.paddingRight = 8.0f;
        self.graph.plotAreaFrame.paddingBottom = 30.0f;
        self.graph.plotAreaFrame.paddingLeft = 42.0f;


        //self.graph.backgroundColor = [[UIColor greenColor] CGColor];

        self.graph.paddingTop = 2.0f;
        self.graph.paddingRight = 2.0f;
        self.graph.paddingBottom = 2.0f;
        self.graph.paddingLeft = 2.0f;



        CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] initWithFrame:newGraph.bounds];
        dataSourceLinePlot.identifier = @"Systolic";

        dataSourceLinePlot.dataSource = self;
        dataSourceLinePlot.delegate   = self;

        CPTColor *areaColor = [CPTColor colorWithComponentRed:249.0/255.0 green:183.0/255.0 blue:183.0/255.0 alpha:.7];
        CPTFill *areaGradientFill = [CPTFill fillWithColor:areaColor];
        [dataSourceLinePlot setAreaFill:areaGradientFill];
        [dataSourceLinePlot setAreaBaseValue:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInt(60)]];//[NSNumber numberWithInt:CPTDecimalFromInt(0)]];

        CPTMutableLineStyle *lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy];
        CPTColor *aaplColor = [CPTColor redColor];
        lineStyle.lineColor = aaplColor;
        CPTXYAxisSet axisSet = (CPTXYAxisSet ) newGraph.axisSet;
        /*

         // 3 - Configure x-axis
         CPTAxis *x = axisSet.xAxis;
         */

        // set the majorGridLinestyleProperty by this line as.
        CPTMutableLineStyle *gridLineStyle = [CPTMutableLineStyle lineStyle];
        gridLineStyle.lineColor = [CPTColor grayColor];
        gridLineStyle.lineWidth = 1.0f;

        gridLineStyle.dashPattern = [NSArray arrayWithObjects:[NSDecimalNumber numberWithInt:1], [NSDecimalNumber numberWithInt:2], nil];
        gridLineStyle.patternPhase=0.0f;



        dataSourceLinePlot.dataLineStyle = lineStyle;

        axisSet.yAxis.majorGridLineStyle = gridLineStyle;
        //        axisSet.yAxis.axisLineStyle = axisLineStyle;

        axisSet.xAxis.majorGridLineStyle = gridLineStyle;
        // axisSet.xAxis.axisLineStyle = axisLineStyle;

        dataSourceLinePlot.dataSource = self;
        [newGraph addPlot:dataSourceLinePlot];



        //-------------------------------------------------------------------------------------

        CPTScatterPlot *dataSourceLinePlot2 = [[CPTScatterPlot alloc] initWithFrame:newGraph.bounds];
        dataSourceLinePlot2.identifier = @"Diastolic";

        dataSourceLinePlot2.dataSource = self;
        dataSourceLinePlot2.delegate   = self;

        CPTColor *areaColor1 = [CPTColor colorWithComponentRed:229.0/255.0 green:87.0/255.0 blue:87.0/255.0 alpha:.7];

        CPTFill *areaGradientFill1 = [CPTFill fillWithColor:areaColor1];
        [dataSourceLinePlot2 setAreaFill:areaGradientFill1];
        [dataSourceLinePlot2 setAreaBaseValue:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInt(60)]];

        CPTMutableLineStyle *lineStyle1 = [dataSourceLinePlot.dataLineStyle mutableCopy];
        CPTColor *aaplColor1 = [CPTColor redColor];
        lineStyle1.lineColor = aaplColor1;
        dataSourceLinePlot2.dataLineStyle = lineStyle1;

        dataSourceLinePlot2.dataSource = self;
        [newGraph addPlot:dataSourceLinePlot2];
    }

    CPTXYGraph *theGraph = self.graph;
    self.graphHost.hostedGraph = theGraph;

    CPTXYPlotSpace plotSpace = (CPTXYPlotSpace )theGraph.defaultPlotSpace;
    plotSpace.allowsUserInteraction = YES;
    plotSpace.delegate = self;


    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
    [numberFormatter setGeneratesDecimalNumbers:NO];

    NSTimeInterval oneDay = 24  60  60;
    NSTimeInterval xLow = 0.0f;

    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromFloat(xLow)]
                                                    length:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromFloat(oneDay*5.0f)]];

    plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:@50.0 length:@(120)];

    // Axes
    CPTXYAxisSet axisSet = (CPTXYAxisSet )theGraph.axisSet;


    NSDate refDate = [NSDate dateWithTimeIntervalSinceReferenceDate:31556926  10];
    // added for date
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"dd/MM"];
    // dateFormatter.dateStyle = kCFDateFormatterShortStyle;
    CPTTimeFormatter *timeFormatter = [[CPTTimeFormatter alloc] initWithDateFormatter:dateFormatter];
    NSLog(@"Ref date: %@", refDate);
    timeFormatter.referenceDate = refDate;
    axisSet.xAxis.labelFormatter = timeFormatter;


    CPTXYAxis *x = axisSet.xAxis;
    x.majorIntervalLength   = [NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromFloat(oneDay)];
    x.orthogonalPosition    = @60.0;
    x.minorTicksPerInterval = 1;

    CPTXYAxis *y  = axisSet.yAxis;
    y.majorIntervalLength   = @20;
    y.majorTickLineStyle    = nil;
    y.minorTicksPerInterval = 4;
    y.minorTickLineStyle    = nil;
    y.orthogonalPosition    = @60.0;
    y.tickDirection = CPTSignPositive;
    [theGraph reloadData];
}

请让我知道如何做到这一点。

---

提前感谢。

您可以使用

-[NSDateFormatter dateFromString:

将从服务器接收的日期字符串转换为

NSDate

对象。看起来图表已设置为显示日期。

感谢您的回复。我们得到的是图形，但我们在x轴上显示的是基于日差间隔（即24小时）的日期，但正如我已经解释过的相同日期有不同时间获得2个值的场景，如何处理这种情况？请查看回复日期以了解更多信息。您可以在散点图上重复x值或y值。如果要删除时间组件，请使用“-[NSCalendar components:fromDate:][code>将日期转换为

NSDateComponents

，清除时间组件，然后检索新的日期。