Coreplot方法numberForPlot：plotfield：recordIndex：不會被調用

Question

我正在創建一個應用程序，它將在幾個屏幕中顯示幾個圖。因此，它被選擇創建一個獨立的類，從Coreplot框架創建一個圖。除了numberForPlot：plotfield：recordIndex：方法外，所有函數/方法都以正確的方式調用。軸和主機視圖設置正確，但沒有繪製數據。

類被稱爲WiGraph

WiGraph.h

#import <Foundation/Foundation.h> 
#import "CorePlot-CocoaTouch.h" 
#import "data.h" 


@interface WiGraph : NSObject <CPTPlotDataSource> 

@property (nonatomic, strong) NSString *gradient; 
@property (nonatomic, strong) CPTGraphHostingView *hostingView; 
@property (nonatomic, strong) NSArray *plotData; 

@property (nonatomic, strong) CPTScatterPlot *plot; 
@property (nonatomic, strong) CPTXYGraph *graph; 


- (id)initWithData:(NSArray *)data; 

- (void)createGraphInView:(UIView *)content; 

- (void)setPlotSpaceWithTimeDifference:(int)diff xStart:(int)starttime xLenght:(int)xlenght yStart:(int)ystart yLength:(int)ylenght; 

- (void)addGradientWithRed:(CGFloat)red andGreen:(CGFloat)green andBlue:(CGFloat)blue andAlpha:(CGFloat)alpha; 

- (void)changeDotColor:(CPTColor *)col; 

- (void)setAxisFromReferenceTime:(int)time andToXHeight:(float)xheight andYHeight:(float)yheight andXInterval:(float)xint andYInterval:(float)yint andLineColor:(CPTColor*)color; 

- (void)addplotToGraph; 

@end 

WiGraph.m

#import "WiGraph.h" 
#import "XMLReader.h" 
#import <QuartzCore/QuartzCore.h> 

@implementation WiGraph 
@synthesize gradient, hostingView, plotData, plot, graph; 

-(id)initWithData:(NSArray *)data 
{ 
    self = [super init]; 
    if (self) { 

     self.plotData = data; 
     self = [self init];   
    } 

    return self; 
} 

#pragma mark create graph 

//This function will create a empty graph 
- (void)createGraphInView:(UIView *)content 
{ 
    hostingView = [[CPTGraphHostingView alloc] initWithFrame:content.bounds]; 

    // Create graph from theme 
    graph = [(CPTXYGraph *)[CPTXYGraph alloc] initWithFrame:CGRectZero]; 
    CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme]; 
    [graph applyTheme:theme]; 
    hostingView.hostedGraph = graph; 


    plot = [[CPTScatterPlot alloc] init]; 
} 

- (void)setAxisFromReferenceTime:(int)time andToXHeight:(float)xheight andYHeight:(float)yheight andXInterval:(float)xint andYInterval:(float)yint andLineColor:(CPTColor*)color; 
{ 
    NSDate *refDate = [NSDate dateWithTimeIntervalSinceReferenceDate:time]; 
// plotting style is set to line plots 
    CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle]; 

    plot.identifier = @"Date Plot"; 

    lineStyle.lineColor = color; 
    lineStyle.lineWidth = 2.0f; 
    lineStyle.miterLimit= 1.0f; 
    plot.dataLineStyle = lineStyle; 
    plot.dataSource = self; 


    // X-axis parameters setting 
    CPTXYAxisSet *axisSet = (id)graph.axisSet; 
    axisSet.xAxis.majorIntervalLength = CPTDecimalFromFloat(xint); 
    axisSet.xAxis.minorTicksPerInterval = 3; 
    axisSet.xAxis.orthogonalCoordinateDecimal = CPTDecim alFromFloat(yheight); //added for date, adjust x line 
    axisSet.xAxis.majorTickLineStyle = lineStyle; 
    axisSet.xAxis.minorTickLineStyle = lineStyle; 
    axisSet.xAxis.axisLineStyle = lineStyle; 
    axisSet.xAxis.minorTickLength = 2.0f; 
    axisSet.xAxis.majorTickLength = 4.0f; 
    axisSet.xAxis.labelOffset = 1.0f; 

    // added for date 
    [NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehavior10_4]; 
    NSDateFormatter *dateFormattersec = [[NSDateFormatter alloc]init]; 
    [dateFormattersec setDateFormat:@"HH:mm"]; 
    CPTTimeFormatter *timeFormatter = [[CPTTimeFormatter alloc] initWithDateFormatter:dateFormattersec]; 
    timeFormatter.referenceDate = refDate; 
    axisSet.xAxis.labelFormatter = timeFormatter; 


    // Y-axis parameters setting  
    axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(yint); 
    axisSet.yAxis.minorTicksPerInterval = 0.5; 
    axisSet.yAxis.orthogonalCoordinateDecimal = CPTDecimalFromFloat(xheight); // added for date, adjusts y line 
    axisSet.yAxis.majorTickLineStyle = lineStyle; 
    axisSet.yAxis.minorTickLineStyle = lineStyle; 
    axisSet.yAxis.axisLineStyle = lineStyle; 
    axisSet.yAxis.minorTickLength = 2.0f; 
    axisSet.yAxis.majorTickLength = 4.0f; 
    axisSet.yAxis.labelOffset = 1.0f; 
} 

-(void)setPlotSpaceWithTimeDifference:(int)diff xStart:(int)starttime xLenght:(int)xlenght yStart:(int)ystart yLength:(int)ylenght 
{ 
graph.paddingLeft = 5.0; 
graph.paddingTop = 5.0; 
graph.paddingRight = 5.0; 
graph.paddingBottom = 5.0; 

// setup a plot space for the plot to live in 
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace; 

plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(starttime) 
               length:CPTDecimalFromFloat(xlenght)]; 
// sets the range of y values 
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(ystart) 
              length:CPTDecimalFromFloat(ylenght)]; 

} 

- (void)addplotToGraph 
{ 
    [graph addPlot:plot]; 
} 


#pragma mark Change Colors 
- (void)addGradientWithRed:(CGFloat)red andGreen:(CGFloat)green andBlue:(CGFloat)blue andAlpha:(CGFloat)alpha 
{ 
    CPTColor *areaColor1  = [CPTColor colorWithComponentRed:red green:green blue:blue alpha:alpha]; 
    CPTGradient *areaGradient1 = [CPTGradient gradientWithBeginningColor:areaColor1 endingColor:[CPTColor clearColor]]; 
areaGradient1.angle = -90.0f; 
    CPTFill *areaGradientFill = [CPTFill fillWithGradient:areaGradient1]; 
    plot.areaFill  = areaGradientFill; 
    plot.areaBaseValue = [[NSDecimalNumber zero] decimalValue]; 

    [self addplotToGraph]; 
} 

- (void)changeDotColor:(CPTColor *)col 
{ 
    CPTPlotSymbol *greenCirclePlotSymbol = [CPTPlotSymbol ellipsePlotSymbol]; 
    greenCirclePlotSymbol.fill = [CPTFill fillWithColor:col]; 
    greenCirclePlotSymbol.size = CGSizeMake(3.0, 3.0); 
    plot.plotSymbol = greenCirclePlotSymbol; 

    [self addplotToGraph]; 
} 

#pragma mark - 
#pragma mark Plot Data Source Methods 

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot 
{ 
    return plotData.count; 
} 

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index 
{ 
    NSDictionary *tempDict = [plotData objectAtIndex:index]; 

    int tmp = [[tempDict retrieveForPath:[NSString stringWithFormat:@"%d",fieldEnum]]intValue]; 


    NSDecimalNumber *rr = [[NSDecimalNumber alloc]initWithInt:tmp]; 
    return rr; 
} 

@end 

對情節的數量不會被調用，這是否有委託辦？

我目前正在創建的對象爲：

//Create new Graph 
grafiek = [[WiGraph alloc]initWithData:self.measuredData.temperature]; 

//Create empty hostingView with size of viewgraphA 
[grafiek createGraphInView:self.viewGraphA]; 

[grafiek setPlotSpaceWithTimeDifference:(self.measuredData.maxDate-self.measuredData.refDate) 
              xStart:(-300) 
              xLenght:((self.measuredData.maxDate-self.measuredData.refDate)+300) 
              yStart:self.measuredData.minTemp 
              yLength:(self.measuredData.maxTemp - self.measuredData.minTemp)]; 

      //Set graph color en scale 
      [grafiek setAxisFromReferenceTime:self.measuredData.refDate 
           andToXHeight:0 
            andYHeight:(self.measuredData.minTemp-1) 
           andXInterval:(self.measuredData.maxDate-self.measuredData.refDate)/4 
           andYInterval:1 
           andLineColor:[CPTColor blueColor]]; 

      //Add Gradient 
      [grafiek addGradientWithRed:1.0 
           andGreen:0.3 
           andBlue:0.3 
           andAlpha:0.8]; 


      //Change dot color 
      [grafiek changeDotColor:[CPTColor redColor]]; 

      //Adding axis and labels to the graph 
      [grafiek addplotToGraph]; 

      [self.viewGraphA addSubview:grafiek.hostingView]; 

任何幫助，將不勝感激

Answer 1

1：確保你已經把它添加到某個plotSpace：

[barChart addPlot:barPlot toPlotSpace:plotSpace]; 

2：

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

    NSDecimalNumber *num = nil; 

    if ([plot isKindOfClass:[CPTBarPlot class]]) { 
     switch (fieldEnum) { 
      case CPTBarPlotFieldBarLocation: 

       num = (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:1]; 
       break; 

      case CPTBarPlotFieldBarTip: 

       num = (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:200]; 

       if ([plot.identifier isEqual:@"Date Plot"]) 
        num = [num decimalNumberBySubtracting:[NSDecimalNumber decimalNumberWithString:aString]]; 

       break; 

     } 
    } 

    return num; 
}