在使用Core Plot构建期间出现链接错误
我刚刚基于教程(http://www.switchonthecode.com/tutorials/using-core-plot-in-an-iphone-application)将核心绘图视图添加到我的应用程序中。我将Core Plot绘图代码放在窗口控制器的windowDidLoad方法中，用于包含CPLayerHostingView的窗口。绘图的代码是：
CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-6)
length:CPDecimalFromFloat(12)];
plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-5)
length:CPDecimalFromFloat(30)];
CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
CPLineStyle *lineStyle = [CPLineStyle lineStyle];
lineStyle.lineColor = [CPColor blackColor];
lineStyle.lineWidth = 2.0f;
axisSet.xAxis.majorIntervalLength = [[NSDecimalNumber decimalNumberWithString:@"5"] decimalValue];
axisSet.xAxis.minorTicksPerInterval = 4;
axisSet.xAxis.minorTicksPerInterval = 4;
axisSet.xAxis.majorTickLineStyle = lineStyle;
axisSet.xAxis.minorTickLineStyle = lineStyle;
axisSet.xAxis.axisLineStyle = lineStyle;
axisSet.xAxis.minorTickLength = 5.0f;
axisSet.xAxis.majorTickLength = 7.0f;
axisSet.xAxis.axisLabelOffset = 3.0f;
axisSet.yAxis.majorIntervalLength = [[NSDecimalNumber decimalNumberWithString:@"5"] decimalValue];
axisSet.yAxis.minorTicksPerInterval = 4;
axisSet.yAxis.minorTicksPerInterval = 4;
axisSet.yAxis.majorTickLineStyle = lineStyle;
axisSet.yAxis.minorTickLineStyle = lineStyle;
axisSet.yAxis.axisLineStyle = lineStyle;
axisSet.yAxis.minorTickLength = 5.0f;
axisSet.yAxis.majorTickLength = 7.0f;
axisSet.yAxis.axisLabelOffset = 3.0f;
CPScatterPlot *xSquaredPlot = [[[CPScatterPlot alloc]
initWithFrame:graph.defaultPlotSpace.bounds] autorelease];
xSquaredPlot.identifier = @"X Squared Plot";
xSquaredPlot.dataLineStyle.lineWidth = 1.0f;
xSquaredPlot.dataLineStyle.lineColor = [CPColor redColor];
xSquaredPlot.dataSource = self;
[graph addPlot:xSquaredPlot];当我构建时，我得到了以下错误：
".objc_class_name_CPPlotRange"，引用自: HistogramWindowController.o中的文本指针@__OBJC@__cls_refs@CPPlotRange。
"_CPDecimalFromFloat"，引用自：-HistogramWindowController windowDidLoad in windowDidLoad WindowController.o -HistogramWindowController windowDidLoad in windowDidLoad WindowController.o -HistogramWindowController windowDidLoad in windowDidLoad WindowController.o -HistogramWindowController windowDidLoad in windowDidLoad WindowController.o
".objc_class_name_CPLineStyle"，引用自: HistogramWindowController.o中的文本指针@__OBJC@__cls_refs@CPLineStyle
".objc_class_name_CPXYGraph"，引用自: HistogramWindowController.o中的文字指针@__OBJC@__cls_refs@CPXYGraph
".objc_class_name_CPScatterPlot"，引用自: HistogramWindowController.o中的literal-pointer@__OBJC@__cls_refs@CPScatterPlot
".objc_class_name_CPPlotSymbol"，引用自: HistogramWindowController.o中的literal-pointer@__OBJC@__cls_refs@CPPlotSymbol
".objc_class_name_CPColor"，引用自: HistogramWindowController.o中的文字指针@__OBJC@__cls_refs@CPColor
".objc_class_name_CPFill"，引用自: HistogramWindowController.o中的文字指针@__OBJC@__cls_refs@CPFill
ld:找不到符号collect2: ld返回%1退出状态
我从来没有遇到过这样的错误。有没有人能说明一下问题可能是什么？
干杯
Stack Overflow用户
发布于 2009-09-04 05:05:06
这意味着你没有在框架中正确链接。您可能刚刚将框架添加到项目中，#import编辑了标题，但忘记了确保框架确实链接到您的目标。
https://stackoverflow.com/questions/1377230
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