如何在iphone中使用core plot在x轴上绘制一年中的月份

如何使用核心图和y轴在x轴上绘制一年中的月份我需要200的倍数 还有，我以前从excel表格中获取的数据。有人能帮我解决这个问题吗。

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提前感谢……

以下是从最近的项目中提取的一些示例代码。我的x轴数据是一个NSDATE数组。我将axisSet设置为普通，然后添加以下代码：

axisSet.xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;

NSMutableArray *countingXPoints=[[NSMutableArray alloc] init];
NSMutableArray *datesAsStrings=[[NSMutableArray alloc] init];

NSDateFormatter *df=[[NSDateFormatter alloc] init];
[df setDateFormat:@"MM-yy"];

for(int i=0; i<[self.xAxisData count]; i++)
{
    [countingXPoints addObject:[NSNumber numberWithInt:i]];
    [datesAsStrings addObject:[df stringFromDate:[self.xAxisData objectAtIndex:i]]];
}

NSArray *xCustomTickLocations = [NSArray arrayWithArray:(NSArray *)countingXPoints];
NSArray *xAxisLabels = [NSArray arrayWithArray:(NSArray *) datesAsStrings];
NSUInteger xLabelLocation = 0;
NSMutableArray *xCustomLabels = [[NSMutableArray alloc] initWithCapacity:[xAxisLabels count]];
for (NSNumber *xTickLocation in xCustomTickLocations)
{
    CPTAxisLabel *newXLabel = [[CPTAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:xLabelLocation++] textStyle:axisSet.xAxis.labelTextStyle];

    newXLabel.tickLocation = [xTickLocation decimalValue];
    newXLabel.offset = 0.0f;
    newXLabel.rotation = M_PI/4.0;
    [xCustomLabels addObject:newXLabel];
}

axisSet.xAxis.axisLabels=[NSSet setWithArray:xCustomLabels];

axisSet.xAxis.labelingPolicy=cptaxislabelingpolicyne；
NSMUTABLEARRY*countingXPoints=[[NSMUTABLEARRY alloc]init]；
NSMUTABLEARRY*datesAsStrings=[[NSMUTABLEARRY alloc]init]；
NSDateFormatter*df=[[NSDateFormatter alloc]init]；
[df setDateFormat:@“MM yy”]；
对于（inti=0；i我已经做了一些您想要的事情，比如这段代码。对不起，我没有在这里明确说明代码，只是粘贴了我在这里使用的整个方法

我希望这能帮到你的忙。在这里，我以一种新的方式实现了graph，你可以像tableview一样刷新它。只需更改数组的值，然后调用[graph reloadData]

- (void)constructScatterPlotForFeedback
 {
// Create graph from theme
[graph release];

graph = [[CPXYGraph alloc] initWithFrame:CGRectZero];
graph.delegate = self;
CPTheme *theme = [CPTheme themeNamed:kCPPlainWhiteTheme];
[graph applyTheme:theme];
feedbackChart.hostedGraph = graph;
[feedbackChart setBackgroundColor:[UIColor clearColor]];

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

graph.plotAreaFrame.paddingLeft = 5.0;
graph.plotAreaFrame.paddingTop = 10.0;
graph.plotAreaFrame.paddingRight = 10.0;
graph.plotAreaFrame.paddingBottom = 10.0;

NSTimeInterval oneHour =  60 * 60;

// Setup plot space
CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.delegate = self;

float xRange;
xRange = [chartData count] + 1.0;

if (xRange>5) {
    xRange = 5.0;
}
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0.0) length:CPDecimalFromFloat(fiveHour*3)];
plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-20.0) length:CPDecimalFromFloat(40.0)];


CPLineStyle *gridline = [CPLineStyle lineStyle];
gridline.lineColor = [CPColor grayColor];
gridline.lineWidth = 1.0f;  

// Axes
CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
    CPXYAxis *x = axisSet.xAxis;
   //   x.orthogonalCoordinateDecimal = CPDecimalFromString(@"0");
x.majorIntervalLength = CPDecimalFromFloat(fiveHour);
 //x.majorIntervalLength = CPDecimalFromFloat(10.0);
//x.majorIntervalLength = CPDecimalFromString(@"10");
x.minorTicksPerInterval = 0;
x.labelOffset=0;
   //   x.labelingPolicy = CPAxisLabelingPolicyNone;

 NSDate *refDate = [NSDate date];
 NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
  //    dateFormatter.dateStyle = kCFTimeZoneNameStyleShortGeneric;
 dateFormatter.dateFormat = @"HH:mm:ss";
  //    dateFormatter.dateStyle = kCFDateFormatterShortStyle;
CPTimeFormatter *timeFormatter = [[[CPTimeFormatter alloc] init   WithDateFormatter:dateFormatter] autorelease];
timeFormatter.referenceDate = refDate;
x.labelFormatter = timeFormatter;

//NSLog(@"refence date : %@", timeFormatter);
CPXYAxis *y = axisSet.yAxis;

y.minorTicksPerInterval = 0;
y.orthogonalCoordinateDecimal = CPDecimalFromString(@"0.0");
y.majorIntervalLength = CPDecimalFromString(@"5");
y.majorGridLineStyle = nil;
   //y.visibleRect 

 y.visibleRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-20.0f)   length:CPDecimalFromFloat(40.0f)];
CPConstraints yConstraints = {CPConstraintNone, CPConstraintFixed};
y.isFloatingAxis=YES;
y.constraints=yConstraints;

    // Create a green plot area
CPScatterPlot *dataSourceLinePlot = [[[CPScatterPlot alloc] init] autorelease];
   dataSourceLinePlot.identifier = @"FeedBack Plot";
dataSourceLinePlot.dataLineStyle.lineWidth = 3.f;
dataSourceLinePlot.dataLineStyle.lineColor = [CPColor blackColor];
dataSourceLinePlot.dataLineStyle.dashPattern = [NSArray arrayWithObjects:[NSNumber numberWithFloat:1.0f], [NSNumber numberWithFloat:1.0f], nil];
dataSourceLinePlot.dataSource = self;

// Animate in the new plot, as an example
dataSourceLinePlot.opacity = 0.0f;
dataSourceLinePlot.cachePrecision = CPPlotCachePrecisionDecimal;


CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeInAnimation.duration = 1.0f;
fadeInAnimation.removedOnCompletion = NO;
fadeInAnimation.fillMode = kCAFillModeForwards;
fadeInAnimation.toValue = [NSNumber numberWithFloat:1.0];
[dataSourceLinePlot addAnimation:fadeInAnimation forKey:@"animateOpacity"];

CPColor *areaColor1 = [CPColor colorWithComponentRed:0.3 green:0.3 blue:1.0 alpha:0.8];
CPGradient *areaGradient1 = [CPGradient gradientWithBeginningColor:areaColor1 endingColor:[CPColor clearColor]];
areaGradient1.angle = -90.0f;

NSUInteger i;

[graph addPlot:dataSourceLinePlot];

NSMutableArray *contentArray1 = [NSMutableArray arrayWithCapacity:100];

NSMutableArray *customTickLocations = [[NSMutableArray alloc] init];
NSMutableArray *xAxisLabels = [[NSMutableArray alloc] init];
for ( i = 0; i < [chartData count]; i++ ) {
//for ( i = 0; i < 10; i++ ) {  
    [customTickLocations addObject:[NSDecimalNumber numberWithInt:i]];
    [xAxisLabels addObject:[NSString stringWithFormat:@"%0.1f", 5.0 * i]];
    Pulse *objPulse1 = (Pulse *)[chartData objectAtIndex:i];
          //id x = [NSNumber numberWithFloat:i*fiveHour];
    id x = [NSNumber numberWithFloat:i];
    id y = [NSNumber numberWithFloat:[objPulse1.feedBack floatValue]];
    NSLog(@"point of gragh for Performance x:%@, y : %@ ", x, y);
    [contentArray1 addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x, @"x", y, @"y", nil]];
}

NSLog(@"Axis lable count : %d", [xAxisLabels count]);
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[chartData count]];
NSUInteger labelLocation = 0;

for (NSNumber *tickLocation in customTickLocations) {
    NSLog(@">>>>>>>>>>>>>>>>> tick location");
    CPAxisLabel *newLabel = [[CPAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle];
    newLabel.tickLocation = [tickLocation decimalValue];
    newLabel.offset = x.labelOffset + x.majorTickLength - 5.0f;
     // newLabel.rotation = M_PI/(2);
    newLabel.rotation = 0;
    [customLabels addObject:newLabel];
    [newLabel release];
}

x.axisLabels =  [NSSet setWithArray:customLabels];

  //    [arrScatter removeAllObjects];
arrScatter = contentArray1;
[arrScatter retain];
  //    NSLog(@">>>>>>>>>>>> :%d", [arrScatter count]);
   }

  -(NSUInteger)numberOfRecordsForPlot:(CPPlot *)plot 
  {

if ( [(NSString *)plot.identifier isEqualToString:@"FeedBack Plot"] ) {
    return [chartData count];
   //       return 10;
}

return 0;
   }


  -(NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:( NSUInteger)index
   {
switch ( fieldEnum ) {
    case CPScatterPlotFieldX:
        return (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index*fiveHour];
    case CPScatterPlotFieldY:
    {
        Pulse *objPulse1 = (Pulse *)[chartData objectAtIndex:index];
        return [NSNumber numberWithFloat:[objPulse1.feedBack floatValue]];          
    }
}
return nil;
   }

   -(CGPoint)plotSpace:(CPPlotSpace *)space willDisplaceBy:(CGPoint)displacement {

  //    NSLog(@">>>>>>>>>>>>>>>>>> : %f", displacement.x);
   return CGPointMake(displacement.x, 0);
   }


  /*
  -(NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:   (NSUInteger)index 
  {
     NSDecimalNumber *num = nil;

if ( [(NSString *)plot.identifier isEqualToString:@"FeedBack Plot"] ) {
    if ( [arrScatter count] != 0) {
        num = [[arrScatter objectAtIndex:index] valueForKey:(fieldEnum == CPScatterPlotFieldX ? @"x" : @"y")];
    }
}
   return num;
   }
   */

    -(CPLayer *)dataLabelForPlot:(CPPlot *)plot recordIndex:(NSUInteger)index {

    Pulse *objPulse1 = (Pulse *)[chartData objectAtIndex:index];
    float value = [objPulse1.feedBack floatValue];       
    //CPTextLayer *textLayer = [[CPTextLayer alloc] initWithText:[NSString stringWithFormat:@"%d", value]];

    CPTextStyle *textStyle = [CPTextStyle textStyle];
    textStyle.color = [CPColor blackColor];

    CPTextLayer *textLayer = [[CPTextLayer alloc] initWithText:[NSString stringWithFormat:@"%0.1f", value] style:textStyle];
    return textLayer;
 }

-（无效）用于反馈的构造散点图
{
//从主题创建图形
[图表发布]；
graph=[[CPXYGraph alloc]initWithFrame:CGRectZero]；
graph.delegate=self；
CPTheme*theme=[CPTheme themeNamed:kCPPlainWhiteTheme]；
[图形应用主题：主题]；
feedbackChart.hostedGraph=图形；
[反馈图表setBackgroundColor:[UIColor clearColor]]；
graph.paddingLeft=0.0；
graph.paddingTop=0.0；
graph.paddingRight=0.0；
graph.paddingBottom=0.0；
graph.plotAreaFrame.paddingLeft=5.0；
graph.plotAreaFrame.paddingTop=10.0；
graph.plotAreaFrame.paddingRight=10.0；
graph.plotAreaFrame.paddingBottom=10.0；
NSTimeInterval一小时=60*60；
//设置绘图空间
CPXYPlotSpace*plotSpace=（CPXYPlotSpace*）graph.defaultPlotSpace；
plotSpace.allowUserInteraction=是；
plotSpace.delegate=self；
浮动范围；
xRange=[chartData count]+1.0；
如果（xRange>5）{
xRange=5.0；
}
plotSpace.xRange=[CPPlotRange plotRangeWithLocation:cpdecimalfloat（0.0）长度：cpdecimalfloat（五小时*3）]；
plotSpace.yRange=[CPPlotRange plotRangeWithLocation:cpdecimalfloat（-20.0）长度：cpdecimalfloat（40.0）]；
CPLineStyle*网格线=[CPLineStyle lineStyle]；
gridline.lineColor=[CPColor grayColor]；
gridline.lineWidth=1.0f；
//斧头
CPXYAxisSet*axisSet=（CPXYAxisSet*）graph.axisSet；
CPXYAxis*x=axisSet.xAxis；
//x.正交坐标CIMAL=CPDecimalFromString（@“0”）；
x、 majorIntervalLength=CPDecimalFromFloat（五小时）；
//x、 majorIntervalLength=CPDecimalFromFloat（10.0）；
//x、 majorIntervalLength=CPDecimalFromString（@“10”）；
x、 minorTicksPerInterval=0；
x、 labelOffset=0；
//x.labelingPolicy=CPAxisLabelingPolicyOne；
NSDate*refDate=[NSDate-date]；
NSDateFormatter*dateFormatter=[[[NSDateFormatter alloc]init]autorelease]；
//dateFormatter.dateStyle=kCFTimeZoneNameStyleShortGeneric；
dateFormatter.dateFormat=@“HH:mm:ss”；
//dateFormatter.dateStyle=kCFDateFormatterShortStyle；
CPTimeFormatter*timeFormatter=[[CPTimeFormatter alloc]init with dateFormatter:dateFormatter]autorelease]；
timeFormatter.referenceDate=refDate；
x、 labelFormatter=时间格式化程序；
//NSLog（@“参考日期：%@”，时间格式）；
CPXYAxis*y=axisSet.yAxis；
y、 minorTicksPerInterval=0；
y、 正交坐标CIMAL=CPDecimalFromString（@“0.0”）；
y、 majorIntervalLength=CPDecimalFromString（@“5”）；
y、 majorGridLineStyle=零；
//y、 可见的
y、 visibleRange=[CPPlotRange plotRangeWithLocation:CPDecimalFromFloat（-20.0f）长度：CPDecimalFromFloat（40.0f）]；
CPConstraints={CPConstraintNone，CPConstraintFixed}；
y、 isFloatingAxis=是；
y、 约束=约束；
//创建绿色绘图区域
CPScatterPlot*数据源线性图=[[CPScatterPlot alloc]init]autorelease]；
dataSourceLinePlot.identifier=@“反馈图”；
dataSourceLinePlot.dataLineStyle.lineWidth=3.f；
dataSourceLinePlot.dataLineStyle.lineColor=[CPColor blackColor]；
dataSourceLinePlot.dataLineStyle.dashPattern=[NSArray arrayWithObjects:[NSNumber numberWithFloat:1.0f]、[NSNumber numberWithFloat:1.0f]、nil]；
dataSourceLinePlot.dataSource=self；
//例如，在新绘图中设置动画
dataSourceLinePlot.opacity=0.0f；
dataSourceLinePlot.cachePrecision=CPPlotCachePrecisionDecimal；
CABasicAnimation*fadeInAnimation=[CABasicAnimation animationWithKeyPath:@“不透明度”]；
fadeInAnimation.duration=1.0f；
fadeInAnimation.removedOnCompletion=否；
fadeInAnimation.fillMode=kCAFillModeForwards；
fadeInAnimation.toValue=[NSNumber numberWithFloat:1.0]；
[dataSourceLinePlot addAnimation:fadeInAnimation forKey:@“AnimatePocity”]；
CPColor*areaColor1=[CPColor COLOR WITH COMPONENTRED:0.3绿色：0.3蓝色：1.0阿尔法：0.8]；
CPGradient*areaGradient1=[CPGradientGradientWithBeginingColor:areaColor1 endingColor:[CPColor clearColor]]；
面积梯度1.0度=-90.0度；
NSUI；
[graph addPlot:dataSourceLinePlot]；
NSMutableArray*contentArray1=[NSMutableArrayWithCapacity:100]；
NSMutableArray*customTickLocations=[[NSMutableArray alloc]init]；
NSMutableArray*xAxisLabels=[[NSMutableArray alloc]init]；
对于（i=0；i<[chartData count]；i++）{
//对于（i=0；i<10；i++）{
[customTickLocations addObject:[NSDecimalNumber Withint:i]]；
[XaxiLabels添加对象：[NSString stringWithFormat:@“%0.1f”，5.0*i]；
脉冲*objPulse1=（脉冲*）[chartData对象索引：i]；
//id x=[NSNumber numberWithFloat:i*fiveHour]；
id x=[NSNumber numberWithFloat:i]；
id y=[NSNumber numberWithFloat:[objPulse1.feedBack floatValue]]；
NSLog（@“性能曲线点x:%@，y:%@”，x，y）；
[contentArray1 addObject:[NSMutableDictionary Dictionary WithObjectsAndKeys:x，@“x”，y，@“y”，nil]；
}
NSLog（@“轴标签计数：%d”，[xAxisLabels计数]；
NSMutableArray*customLabels=[NSMutableArray阵列容量：[图表数据计数]]；
NSU整数标签位置=0；
用于（NSNumber*customTickLocations中的tickLocation）{
NSLog（@“>>>>>>>>>>>>>>>>>>>>>>>>>ti
[...]

// Graph host view
CPTGraphHostingView* hostView = [[CPTGraphHostingView alloc] initWithFrame:self.view.frame];
[self.view addSubview: hostView];

// Your graph
CPTGraph* graph = [[CPTXYGraph alloc] initWithFrame:hostView.bounds];
hostView.hostedGraph = graph;
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)[graph axisSet];    

// xAxis configuration
CPTXYAxis *xAxis = [axisSet xAxis];
[xAxis setLabelingPolicy:CPTAxisLabelingPolicyFixedInterval];
// Prepare dateFormat for current Locale, we want "JAN 2014" "FEB 2014" and so on
NSString *dateComponents = @"MMMYY";
NSString *localDateFormat = [NSDateFormatter dateFormatFromTemplate:dateComponents options:0 locale:[NSLocale currentLocale]];
NSDateFormatter *labelDateFormatter=[[NSDateFormatter alloc] init];
labelDateFormatter.dateFormat=localDateFormat;    
// Set xAxis date Formatter
CPTCalendarFormatter *xDateYearFormatter = [[CPTCalendarFormatter alloc] initWithDateFormatter:labelDateFormatter];
//Keep in mind this reference date, it will be used to calculate NSNumber in dataSource method
xDateYearFormatter.referenceDate = [NSDate dateWithTimeIntervalSince1970:0];
xDateYearFormatter.referenceCalendarUnit=NSMonthCalendarUnit;    
[xAxis setLabelFormatter:xDateYearFormatter];

// yAxis configuration
CPTXYAxis *yAxis = [axisSet yAxis];
[yAxis setMajorIntervalLength:CPTDecimalFromFloat(_YOURYINTERVAL_)];
[yAxis setLabelingPolicy:CPTAxisLabelingPolicyFixedInterval];
[yAxis setLabelFormatter:_YOURYFORMATTER_];
[yAxis setAxisConstraints:[CPTConstraints constraintWithLowerOffset:0.0]]

// Get the (default) plotspace from the graph so we can set its x/y ranges
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
NSDate *startDate=_YOURSTARTINGDATE_
//Number of months since the reference date
NSInteger xStart=[[[NSCalendar currentCalendar] components: NSCalendarUnitMonth
                                 fromDate: xDateYearFormatter.referenceDate
                                   toDate: _YOURSTARTINGDATE_
                                  options: 0] month];    
[plotSpace setXRange: [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInteger(xStart)     length:CPTDecimalFromInteger(_YOURDATESARRAY_.count-1)]];
[plotSpace setYRange: [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0) length:CPTDecimalFromFloat(_YOURMAXYVALUE_)]];

[...]

 -(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
    switch (fieldEnum) {

        case CPTScatterPlotFieldX: {

            NSInteger monthsOffset=[[[NSCalendar currentCalendar] components: NSCalendarUnitMonth  fromDate: [NSDate dateWithTimeIntervalSince1970:0] toDate: [_YOURDATESARRAY_ objectAtIndex:index] options: 0] month];                
            NSNumber *val = [NSNumber numberWithInteger:monthsOffset];    
            return val;
            break;
        }
        case CPTScatterPlotFieldY: {
            NSNumber *val=_YOURVALUEFORYAXIS_;
            return val;
            break;
        }
        default:
            break;
    }

    return nil;
}