问CorePlot:具有多个图层的数据标签

EN

//Point symbol
NSInteger symbolIndex = interval.symbolIndex;
UIImage *img = [Common getPointSymbol:symbolIndex];
CGRect imageRect = CGRectMake(0, 0 , 60, 50);
CPTBorderedLayer * imageLayer = [[CPTBorderedLayer alloc] initWithFrame:imageRect];
imageLayer.fill = [CPTFill fillWithImage:[CPTImage imageWithCGImage:[img CGImage] scale:img.scale]];

//Point text
CPTMutableTextStyle *dataLabelTextStyle = [CPTMutableTextStyle textStyle];
dataLabelTextStyle.color    = [CPTColor blackColor];
dataLabelTextStyle.fontSize = 12.0f;
dataLabelTextStyle.fontName = @"Helvetica";
CPTTextLayer *textLayer = [[CPTTextLayer alloc] initWithText:point.title style:dataLabelTextStyle];
[imageLayer addSublayer:textLayer];

return imageLayer;