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我無法獲得散點圖顯示。我在Xcode 6.3上使用核心繪圖1.6和以下this tutorial.Core Plot中expandRangeByFactor方法的錯誤
我已經按照教程'到T'和餅圖工作，但移動到散點圖時，我得到這樣的線路上的錯誤...
[xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
它說：「發送「NSDecimal不兼容類型的參數‘的NSNumber *’。所以，我本能地改變行這個......
[xRange expandRangeByFactor:[NSNumber numberWithFloat:1.1f]];
而且根據this post by eskroch of Core Plot.
我將Swift更新推送到release-2.0分支。我將所有外部可見的方法和屬性的類型從NSDecimal更改爲NSNumber和/或使用新類型對其進行補充。我更新了所有示例應用程序以使用新API，並將其中的兩個（DatePlot和iPhone版本的CPTTestApp）翻譯爲Swift。他們編譯，但我現在無法測試它們，所以請報告任何問題。
所以我應該是正確的使其成爲一個NSNumber的。
然後它編譯，但屏幕是空白的。我不知道發生了什麼......我認爲開發人員改變了CPTDecimalFromCGFloat方法或某事，但現在我不知所措。 有沒有人有一個快速的想法，它可能是什麼？我是否正確地將此編號設爲NSNumber而不是CPTDecimal？
而下面是其中發生問題的整個方法。
-(void) configurePlots {
// 1 - Get graph and plot space
CPTGraph *graph = self.hostView.hostedGraph;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
// 2 - Create the three plots
CPTScatterPlot *aaplPlot = [[CPTScatterPlot alloc] init];
aaplPlot.dataSource = self;
aaplPlot.identifier = CPDTickerSymbolAAPL;
CPTColor *aaplColor = [CPTColor redColor];
[graph addPlot:aaplPlot toPlotSpace:plotSpace];
CPTScatterPlot *googPlot = [[CPTScatterPlot alloc] init];
googPlot.dataSource = self;
googPlot.identifier = CPDTickerSymbolGOOG;
CPTColor *googColor = [CPTColor greenColor];
[graph addPlot:googPlot toPlotSpace:plotSpace];
CPTScatterPlot *msftPlot = [[CPTScatterPlot alloc] init];
msftPlot.dataSource = self;
msftPlot.identifier = CPDTickerSymbolMSFT;
CPTColor *msftColor = [CPTColor blueColor];
[graph addPlot:msftPlot toPlotSpace:plotSpace];
// 3 - Set up plot space
[plotSpace scaleToFitPlots:[NSArray arrayWithObjects:aaplPlot, googPlot, msftPlot, nil]];
CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
[xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)]; // error here
plotSpace.xRange = xRange;
CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy];
[yRange expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)]; // error here
plotSpace.yRange = yRange;
// 4 - Create styles and symbols
CPTMutableLineStyle *aaplLineStyle = [aaplPlot.dataLineStyle mutableCopy];
aaplLineStyle.lineWidth = 2.5;
aaplLineStyle.lineColor = aaplColor;
aaplPlot.dataLineStyle = aaplLineStyle;
CPTMutableLineStyle *aaplSymbolLineStyle = [CPTMutableLineStyle lineStyle];
aaplSymbolLineStyle.lineColor = aaplColor;
CPTPlotSymbol *aaplSymbol = [CPTPlotSymbol ellipsePlotSymbol];
aaplSymbol.fill = [CPTFill fillWithColor:aaplColor];
aaplSymbol.lineStyle = aaplSymbolLineStyle;
aaplSymbol.size = CGSizeMake(6.0f, 6.0f);
aaplPlot.plotSymbol = aaplSymbol;
CPTMutableLineStyle *googLineStyle = [googPlot.dataLineStyle mutableCopy];
googLineStyle.lineWidth = 1.0;
googLineStyle.lineColor = googColor;
googPlot.dataLineStyle = googLineStyle;
CPTMutableLineStyle *googSymbolLineStyle = [CPTMutableLineStyle lineStyle];
googSymbolLineStyle.lineColor = googColor;
CPTPlotSymbol *googSymbol = [CPTPlotSymbol starPlotSymbol];
googSymbol.fill = [CPTFill fillWithColor:googColor];
googSymbol.lineStyle = googSymbolLineStyle;
googSymbol.size = CGSizeMake(6.0f, 6.0f);
googPlot.plotSymbol = googSymbol;
CPTMutableLineStyle *msftLineStyle = [msftPlot.dataLineStyle mutableCopy];
msftLineStyle.lineWidth = 2.0;
msftLineStyle.lineColor = msftColor;
msftPlot.dataLineStyle = msftLineStyle;
CPTMutableLineStyle *msftSymbolLineStyle = [CPTMutableLineStyle lineStyle];
msftSymbolLineStyle.lineColor = msftColor;
CPTPlotSymbol *msftSymbol = [CPTPlotSymbol diamondPlotSymbol];
msftSymbol.fill = [CPTFill fillWithColor:msftColor];
msftSymbol.lineStyle = msftSymbolLineStyle;
msftSymbol.size = CGSizeMake(6.0f, 6.0f);
msftPlot.plotSymbol = msftSymbol;
}