coreplot 2 在图中绘制

Question

我目前正在为一个应用程序创建一个图表，使用 coreplot 并且有一个我无法解释的问题。

我读过（它没有帮助）： core-plot, unable to plot two graphs

问题：为什么只显示第二个添加的情节？如果我更改将它们添加到 hostView 的顺序，则仅显示我添加的最后一个。请参阅下面的代码和屏幕截图。

图表将包含 2 个不同的图

PROBLEM:
- both plots show perfectly if added alone.
- if i add both plots, only the second (last) one added gets displayed.
- to assure you that both are well on their own i added screenshots on the bottom.

首先绘制单0线

identifier : @"nullLine"
name: nullPlot

第二个图我存储的数据的散点图

identifier : @"balanceChart"
name: plot

这是我的一些代码：

    CPTGraphHostingView *host = [self buildGraphView];   //returns a viewwithframe
    [view addSubview:host];

    graph = [[CPTXYGraph alloc ]initWithFrame:host.frame];
    host.hostedGraph = graph;

    CPTScatterPlot *plot = [[CPTScatterPlot alloc]init ];
    plot.dataSource = self;
    [plot setIdentifier:@"balanceChart"];

    // Setup plot space
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
    plotSpace.allowsUserInteraction = YES;
    plotSpace.xRange                = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(20.0)];
    plotSpace.yRange                = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(-200.0) length:CPTDecimalFromFloat(400.0)];

    CPTScatterPlot *nullPlot = [[CPTScatterPlot alloc]init ];
    nullPlot.dataSource = self;
    [nullPlot setIdentifier:@"nullLine"];
    [nullPlot setPlotSpace:plotSpace];
    [plot setPlotSpace:plotSpace];


    [graph addPlot:nullPlot];
    [graph addPlot:plot];

还有我的doubleForPlot 函数：

注意：我只添加这个函数来完成 - 它绝对 100% 返回两个图表的正确值！

-(double)doubleForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index{

// NULL CHART
if ([(NSString *)plot.identifier isEqualToString:@"nullLine"]) {
    if (fieldEnum == CPTScatterPlotFieldX) {
        NSLog(@"Plot: %@,fieldEnum: %d, index: %d",plot,fieldEnum,index);
        return index+1;
    }
    if (fieldEnum == CPTScatterPlotFieldY) {
        NSLog(@"Plot: %@,fieldEnum: %d, index: %d",plot,fieldEnum,index);
        double zero = 0;
        return zero;
    }
}


// BALANCE CHART
if ([(NSString *)plot.identifier isEqualToString:@"balanceChart"]) {

    if (fieldEnum == CPTScatterPlotFieldX) {

        NSLog(@"Axis: %d and Value: %d",fieldEnum, index+1);
        return (double)(index+1);
    }

    if (fieldEnum == CPTScatterPlotFieldY) {

        int dayInt = [dataHandler getDayNumber:[NSDate date]].intValue;
        double total = 0;
        for (Expense *exp in [allMonthExpenses objectAtIndex:index]) {
            total = total + exp.value.doubleValue;
        }

        NSDate *date = [NSDate dateWithTimeIntervalSinceNow:(-(dayInt-(int)index-1)*(60*60*24))];

        double budgetValue = [dataHandler getSpecificBudgetForDate:[NSDate dateWithTimeIntervalSinceNow:(-(dayInt-(int)index-1)*(60*60*24))] ];
        total = budgetValue+total;    

        NSLog(@"\n Axis:%d \n Record for Day: %@ \n IndexForPlot: %d \n Value: %.2f \n",fieldEnum, date,index,total);

        return total;
    }
}


return 0;
}

numberOfRecordsForPlot 方法来了：

注意两个图的记录数量相同。这也确实返回了正确的数字。

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot{    
return [dataHandler getDayNumber:[NSDate date]].intValue;

}

旁注请不要介意图表的格式；-)

Answer 1

我在一个测试应用程序中尝试了您的代码，它运行良好——两个图都出现了。您的代码中一定还有其他内容。