Objective c 图isn'；t在CorePlot上工作

我从“cpttestap iPhone”示例中获取了代码。应通过调用一个方法绘制完整的绘图。我刚刚更改了HostingView的实现。它由“addSubview”添加到另一个视图中

轴工作正常，但没有显示任何图形

关于财产

@property (nonatomic, strong) CPTGraphHostingView *HostingView;

绘图的方法

 -(void)createPlot{

CGRect frame = CGRectMake(0,0,500,500);
self.HostingView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:frame];

CPTXYGraph *graph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
[graph applyTheme:theme];



self.HostingView.hostedGraph   = graph;

[self.AnotherView addSubview:self.HostingView];

// Create graph from theme
graph.paddingLeft   = 10.0;
graph.paddingTop    = 10.0;
graph.paddingRight  = 10.0;
graph.paddingBottom = 10.0;

// Setup plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.xRange                = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(2.0)];
plotSpace.yRange                = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(3.0)];

// Axes
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x          = axisSet.xAxis;
x.majorIntervalLength         = CPTDecimalFromString(@"0.5");
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
x.minorTicksPerInterval       = 2;
NSArray *exclusionRanges = [NSArray arrayWithObjects:
                            [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.99) length:CPTDecimalFromFloat(0.02)],
                            [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.99) length:CPTDecimalFromFloat(0.02)],
                            [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(2.99) length:CPTDecimalFromFloat(0.02)],
                            nil];
x.labelExclusionRanges = exclusionRanges;

CPTXYAxis *y = axisSet.yAxis;
y.majorIntervalLength         = CPTDecimalFromString(@"0.5");
y.minorTicksPerInterval       = 5;
y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
exclusionRanges               = [NSArray arrayWithObjects:
                                 [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.99) length:CPTDecimalFromFloat(0.02)],
                                 [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.99) length:CPTDecimalFromFloat(0.02)],
                                 [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(3.99) length:CPTDecimalFromFloat(0.02)],
                                 nil];
y.labelExclusionRanges = exclusionRanges;
y.delegate             = self;

// Create a blue plot area
CPTScatterPlot *boundLinePlot  = [[CPTScatterPlot alloc] init];
CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle];
lineStyle.miterLimit        = 1.0f;
lineStyle.lineWidth         = 3.0f;
lineStyle.lineColor         = [CPTColor blueColor];
boundLinePlot.dataLineStyle = lineStyle;
boundLinePlot.identifier    = @"Blue Plot";
boundLinePlot.dataSource    = self;
[graph addPlot:boundLinePlot];

// Do a blue gradient
CPTColor *areaColor1       = [CPTColor colorWithComponentRed:0.3 green:0.3 blue:1.0 alpha:0.8];
CPTGradient *areaGradient1 = [CPTGradient gradientWithBeginningColor:areaColor1 endingColor:[CPTColor clearColor]];
areaGradient1.angle = -90.0f;
CPTFill *areaGradientFill = [CPTFill fillWithGradient:areaGradient1];
boundLinePlot.areaFill      = areaGradientFill;
boundLinePlot.areaBaseValue = [[NSDecimalNumber zero] decimalValue];

// Add plot symbols
CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle];
symbolLineStyle.lineColor = [CPTColor blackColor];
CPTPlotSymbol *plotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
plotSymbol.fill          = [CPTFill fillWithColor:[CPTColor blueColor]];
plotSymbol.lineStyle     = symbolLineStyle;
plotSymbol.size          = CGSizeMake(10.0, 10.0);
boundLinePlot.plotSymbol = plotSymbol;

// Create a green plot area
CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init];
lineStyle                        = [CPTMutableLineStyle lineStyle];
lineStyle.lineWidth              = 3.f;
lineStyle.lineColor              = [CPTColor greenColor];
lineStyle.dashPattern            = [NSArray arrayWithObjects:[NSNumber numberWithFloat:5.0f], [NSNumber numberWithFloat:5.0f], nil];
dataSourceLinePlot.dataLineStyle = lineStyle;
dataSourceLinePlot.identifier    = @"Green Plot";
dataSourceLinePlot.dataSource    = self;

// Put an area gradient under the plot above
CPTColor *areaColor       = [CPTColor colorWithComponentRed:0.3 green:1.0 blue:0.3 alpha:0.8];
CPTGradient *areaGradient = [CPTGradient gradientWithBeginningColor:areaColor endingColor:[CPTColor clearColor]];
areaGradient.angle               = -90.0f;
areaGradientFill                 = [CPTFill fillWithGradient:areaGradient];
dataSourceLinePlot.areaFill      = areaGradientFill;
dataSourceLinePlot.areaBaseValue = CPTDecimalFromString(@"1.75");

// Animate in the new plot, as an example
dataSourceLinePlot.opacity = 0.0f;
[graph addPlot:dataSourceLinePlot];

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"];

// Add some initial data
NSMutableArray *contentArray = [NSMutableArray arrayWithCapacity:100];
NSUInteger i;
for ( i = 0; i < 60; i++ ) {
    id x = [NSNumber numberWithFloat:1 + i * 0.05];
    id y = [NSNumber numberWithFloat:1.2 * rand() / (float)RAND_MAX + 1.2];
    [contentArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x, @"x", y, @"y", nil]];
}
self.dataForPlot = contentArray;

#ifdef PERFORMANCE_TEST
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(changePlotRange) userInfo:nil repeats:YES];

#endif
}

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正在调用数据源方法吗？返回哪些值？数据源方法numberOfRecordsForPlot:返回值0。未调用其他方法。则绘图工作正常。你告诉它没有数据显示，所以什么也没画。我发现了我的错。self.dataForPlot=contentArray；应为self->dataForPlot=contentArray；现在一切都很好。

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
return [dataForPlot count];
}

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

-(BOOL)axis:(CPTAxis *)axis shouldUpdateAxisLabelsAtLocations:(NSSet *)locations
{
....
}