Change the appearance of the Core Plot title
I would like to use a simple black background for my pie chart that I am creating using Core Plot. I have a nice rendering of the chart, but the title is in black by default, which is difficult to see against a black background. I know this is showing because when I change the theme I can see it in black. Can anyone tell me how to change the color of the text like it did with the data labels?
Here is a snippet of my code ...
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];
}
Thanks a lot in advance for any help / tips / links offered ...
+3
source to share
1 answer
I found an answer that was staring me in the face all along in the Core Plot sample code ...
For someone who stumbled upon this question, here's the answer:
CPTMutableTextStyle *whiteText = [CPTMutableTextStyle textStyle];
whiteText.color = [CPTColor whiteColor];
graph.titleTextStyle = whiteText;
graph.title = @"Your Title Here...";
+5
source to share