Coreplot graph fill color along y-axis

问题

![enter image description here][1]

Can anybody tell how to draw dark blue masked area on coreplot graph from y-axis 4 to 10 and through out the x-axis like i showed in the figure.

回答1:

Core Plot calls that a "background limit band". There are examples in several of the example apps, including the Plot Gallery.

CPTPlotRange *range = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(4.0)
                                                   length:CPTDecimalFromDouble(6.0)];
CPTFill *bandFill = [CPTFill fillWithColor:[CPTColor blueColor]];
[yAxis addBackgroundLimitBand:[CPTLimitBand limitBandWithRange:range
                                                          fill:bandFill]];

来源：https://stackoverflow.com/questions/12042447/coreplot-graph-fill-color-along-y-axis