更改Core Plot餅圖標題的外觀

我想使用簡單的黑色背景添加到我使用Core Plot生成的餅圖中。我有很好的圖表渲染，但標題是在黑色背景上很難看到的默認黑色。我知道這是顯示，因爲當我改變主題時，我可以看到它黑色。任何人都可以告訴我如何改變文字顏色，就像我對數據標籤做的一樣？更改Core Plot餅圖標題的外觀

這裏是我的代碼片段...

graph = [[CPTXYGraph alloc] initWithFrame:self.view.bounds]; 
    CPTGraphHostingView *hostingView = (CPTGraphHostingView*)self.view; 
    hostingView.hostedGraph = graph; 

    CPTPieChart *pieChart = [[CPTPieChart alloc] init]; 
    pieChart.dataSource = self; 
    pieChart.pieRadius = 80.0; 
    pieChart.identifier = @"PieChart1"; 
    pieChart.startAngle = M_PI_4; 
    pieChart.sliceDirection = CPTPieDirectionCounterClockwise; 

    [graph addPlot:pieChart]; 
    graph.title = @"Proportion of Sessions per Sport"; 

} 

-(CPTLayer *)dataLabelForPlot:(CPTPlot *)plot recordIndex:(NSUInteger)index { 
    static CPTMutableTextStyle *whiteText = nil; 
    if (!whiteText) { 
     whiteText = [[CPTMutableTextStyle alloc] init]; 
     whiteText.color = [CPTColor whiteColor]; 
    } 

    CPTLayer *layer = [[CPTLayer alloc] initWithFrame:CGRectMake(50, 50, 100, 20)]; 
    CPTTextLayer *newLayer = nil; 
    newLayer = [[CPTTextLayer alloc] initWithText:[NSString stringWithFormat:@"%@", [pieLabels objectAtIndex:index]] style:whiteText]; 
    [layer addSublayer:newLayer]; 
    return newLayer; 
} 

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

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { 
    return [self.pieData objectAtIndex:index]; 
} 

-(NSString *)legendTitleForPieChart:(CPTPieChart *)pieChart recordIndex:(NSUInteger)index { 
    return [NSString stringWithFormat:@"Pie Slice %u", index]; 
}

提前提供的任何幫助/諮詢/鏈接感謝...

來源

2012-03-19 Sean

我發現它在盯着我的答案面對整個時間在覈心情節的示例代碼...

爲別人絆倒在這裏這個問題的答案：

CPTMutableTextStyle *whiteText = [CPTMutableTextStyle textStyle]; 
    whiteText.color = [CPTColor whiteColor]; 
    graph.titleTextStyle = whiteText; 
    graph.title = @"Your Title Here...";

來源

2012-03-19 09:48:32 Sean

更改Core Plot餅圖標題的外觀

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