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我正尝试使用核心图产生一个简单的线图，并且无法获得一个实线。我遇到的问题是，似乎该线路默认为虚线。核心图 - 折线图
我是iOS和Xcode开发的新手，所以请原谅我，如果它很痛苦简单。我附上我的代码，任何人都可以看到我错过了什么？ 在此先感谢！
的代码是基于示例代码包含项目：
-(void)constructScatterPlot
{
graph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
[graph applyTheme:theme];
graphView.hostedGraph = graph;
graph.plotAreaFrame.borderLineStyle = nil;
graph.paddingLeft = 0;
graph.paddingTop = 0;
graph.paddingRight = 0;
graph.paddingBottom = 0;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(100.0)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(20.0)];
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x = axisSet.xAxis;
x.labelFormatter = nil;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
x.axisLineStyle = nil;
CPTXYAxis *y = axisSet.yAxis;
y.labelFormatter = nil;
y.labelingPolicy = CPTAxisLabelingPolicyNone;
y.axisLineStyle = nil;
CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init];
CPTMutableLineStyle *lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy];
lineStyle.lineWidth = 1.f;
lineStyle.lineColor = [CPTColor whiteColor];
dataSourceLinePlot.dataLineStyle = lineStyle;
dataSourceLinePlot.dataSource = self;
[graph addPlot:dataSourceLinePlot];
}