Xcode 4.2のiOS coreplot

Question

私はアプリをコンパイルしていますが、グラフは表示されません。

RaceDetailView.h

#import <UIKit/UIKit.h> 
#import "CorePlot-CocoaTouch.h" 

@interface RaceDetailView : UIView <CPTPlotDataSource, CPTPlotSpaceDelegate> 

@property (nonatomic, retain) NSArray *plotData; 
@property (nonatomic, retain) NSString *title; 
@property (nonatomic, retain) CPTGraphHostingView *layerHostingView; 
@property CGFloat labelRotation; 

- (void)setTitleDefaultsForGraph:(CPTGraph *)graph withBounds:(CGRect)bounds; 
- (void)setPaddingDefaultsForGraph:(CPTGraph *)graph withBounds:(CGRect)bounds; 
-(NSUInteger)numberOfRecords; 
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index; 

@end 

RaceDetailView.m

#import "RaceDetailView.h" 

@implementation RaceDetailView 

@synthesize layerHostingView; 
@synthesize labelRotation; 
@synthesize title; 
@synthesize plotData; 

- (id)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) { 
     title = @"my race chart"; 

     plotData = [[NSMutableArray alloc] initWithObjects: 
        [NSNumber numberWithDouble:20.0], 
        [NSNumber numberWithDouble:30.0], 
        [NSNumber numberWithDouble:60.0], 
        nil]; 

     CPTGraph *graph = [[[CPTXYGraph alloc] initWithFrame:frame] autorelease]; 
     //[self addGraph:graph toHostingView:layerHostingView]; 
     layerHostingView.hostedGraph = graph; 
     //[self applyTheme:theme toGraph:graph withDefault:[CPTTheme themeNamed:kCPTDarkGradientTheme]]; 
     [graph applyTheme:[CPTTheme themeNamed:kCPTDarkGradientTheme]]; 

     [self setTitleDefaultsForGraph:graph withBounds:frame]; 
     [self setPaddingDefaultsForGraph:graph withBounds:frame]; 

     // Setup scatter plot space 
     CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace; 
     plotSpace.allowsUserInteraction = YES; 
     plotSpace.delegate = self; 

     // Grid line styles 
     CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle]; 
     majorGridLineStyle.lineWidth = 0.75; 
     majorGridLineStyle.lineColor = [[CPTColor colorWithGenericGray:0.2] colorWithAlphaComponent:0.75]; 

     CPTMutableLineStyle *minorGridLineStyle = [CPTMutableLineStyle lineStyle]; 
     minorGridLineStyle.lineWidth = 0.25; 
     minorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.1];  

     CPTMutableLineStyle *redLineStyle = [CPTMutableLineStyle lineStyle]; 
     redLineStyle.lineWidth = 10.0; 
     redLineStyle.lineColor = [[CPTColor redColor] colorWithAlphaComponent:0.5]; 

     // Axes 
     // Label x axis with a fixed interval policy 
     CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet; 
     CPTXYAxis *x = axisSet.xAxis; 
     x.majorIntervalLength = CPTDecimalFromString(@"0.5"); 
     x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"1.0"); 
     x.minorTicksPerInterval = 2; 
     x.majorGridLineStyle = majorGridLineStyle; 
     x.minorGridLineStyle = minorGridLineStyle; 

     x.title = @"X Axis"; 
     x.titleOffset = 30.0; 
     x.titleLocation = CPTDecimalFromString(@"1.25"); 

     // Label y with an automatic label policy. 
     CPTXYAxis *y = axisSet.yAxis; 
     y.labelingPolicy = CPTAxisLabelingPolicyAutomatic; 
     y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"1.0"); 
     y.minorTicksPerInterval = 2; 
     y.preferredNumberOfMajorTicks = 8; 
     y.majorGridLineStyle = majorGridLineStyle; 
     y.minorGridLineStyle = minorGridLineStyle; 
     y.labelOffset = 10.0; 

     y.title = @"Y Axis"; 
     y.titleOffset = 30.0; 
     y.titleLocation = CPTDecimalFromString(@"1.0"); 

     // Rotate the labels by 45 degrees, just to show it can be done. 
     labelRotation = M_PI * 0.25; 

     // Set axes 
     //graph.axisSet.axes = [NSArray arrayWithObjects:x, y, y2, nil]; 
     graph.axisSet.axes = [NSArray arrayWithObjects:x, y, nil]; 

     // Create a plot that uses the data source method 
     CPTScatterPlot *dataSourceLinePlot = [[[CPTScatterPlot alloc] init] autorelease]; 
     dataSourceLinePlot.identifier = @"Data Source Plot"; 

     CPTMutableLineStyle *lineStyle = [[dataSourceLinePlot.dataLineStyle mutableCopy] autorelease]; 
     lineStyle.lineWidth = 3.0; 
     lineStyle.lineColor = [CPTColor greenColor]; 
     dataSourceLinePlot.dataLineStyle = lineStyle; 

     dataSourceLinePlot.dataSource = self; 
     [graph addPlot:dataSourceLinePlot]; 

     // Auto scale the plot space to fit the plot data 
     // Extend the y range by 10% for neatness 
     [plotSpace scaleToFitPlots:[NSArray arrayWithObjects:dataSourceLinePlot, nil]]; 
     CPTPlotRange *xRange = plotSpace.xRange; 
     CPTPlotRange *yRange = plotSpace.yRange; 
     [xRange expandRangeByFactor:CPTDecimalFromDouble(1.3)]; 
     [yRange expandRangeByFactor:CPTDecimalFromDouble(1.3)]; 
     plotSpace.yRange = yRange; 

     // Restrict y range to a global range 
     CPTPlotRange *globalYRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) 
                    length:CPTDecimalFromFloat(2.0f)]; 
     plotSpace.globalYRange = globalYRange; 

     // set the x and y shift to match the new ranges 
     CGFloat length = xRange.lengthDouble; 
     //xShift = length - 3.0; 
     length = yRange.lengthDouble; 
     //yShift = length - 2.0; 

     // Add plot symbols 
     CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle]; 
     symbolLineStyle.lineColor = [CPTColor blackColor]; 
     CPTPlotSymbol *plotSymbol = [CPTPlotSymbol ellipsePlotSymbol]; 
     plotSymbol.fill = [CPTFill fillWithColor:[CPTColor blueColor]]; 
     plotSymbol.lineStyle = symbolLineStyle; 
     plotSymbol.size = CGSizeMake(10.0, 10.0); 
     dataSourceLinePlot.plotSymbol = plotSymbol; 

     // Set plot delegate, to know when symbols have been touched 
     // We will display an annotation when a symbol is touched 
     dataSourceLinePlot.delegate = self; 
     dataSourceLinePlot.plotSymbolMarginForHitDetection = 5.0f; 

     // Add legend 
     graph.legend = [CPTLegend legendWithGraph:graph]; 
     graph.legend.textStyle = x.titleTextStyle; 
     graph.legend.fill = [CPTFill fillWithColor:[CPTColor darkGrayColor]]; 
     graph.legend.borderLineStyle = x.axisLineStyle; 
     graph.legend.cornerRadius = 5.0; 
     graph.legend.swatchSize = CGSizeMake(25.0, 25.0); 
     graph.legendAnchor = CPTRectAnchorBottom; 
     graph.legendDisplacement = CGPointMake(0.0, 12.0); 
    } 
    return self; 
} 

- (void)setTitleDefaultsForGraph:(CPTGraph *)graph withBounds:(CGRect)bounds 
{ 
    graph.title = title; 
    CPTMutableTextStyle *textStyle = [CPTMutableTextStyle textStyle]; 
    textStyle.color = [CPTColor grayColor]; 
    textStyle.fontName = @"Helvetica-Bold"; 
    textStyle.fontSize = round(bounds.size.height/20.0f); 
    graph.titleTextStyle = textStyle; 
    graph.titleDisplacement = CGPointMake(0.0f, round(bounds.size.height/18.0f)); // Ensure that title displacement falls on an integral pixel 
    graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;  
} 

- (void)setPaddingDefaultsForGraph:(CPTGraph *)graph withBounds:(CGRect)bounds 
{ 
    float boundsPadding = round(bounds.size.width/20.0f); // Ensure that padding falls on an integral pixel 
    graph.paddingLeft = boundsPadding; 

    if (graph.titleDisplacement.y > 0.0) { 
     graph.paddingTop = graph.titleDisplacement.y * 2; 
    } 
    else { 
     graph.paddingTop = boundsPadding; 
    } 

    graph.paddingRight = boundsPadding; 
    graph.paddingBottom = boundsPadding;  
} 

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot 
{ 
    return [plotData count]; 
} 

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index 
{ 
    NSNumber *num; 
    if (fieldEnum == CPTPieChartFieldSliceWidth) { 
     num = [plotData objectAtIndex:index]; 
    } 
    else { 
     return [NSNumber numberWithInt:index]; 
    } 

    return num; 
} 

@end 

編集：あなたは、これがCorePlot例SimpleScatterPlotからであることに気づくかもしれません。

Answer 1

なぜこのコードはUIViewにありますか？このコードは通常、ビューコントローラ（UIViewController）にあります。例を引っ張ったPlot Galleryアプリケーションは、メインビュー領域内の複数の場所でプロットを使用し、リストやブラウザビューのサムネイル画像を作成するため、もう少し複雑です。

layerHostingViewを設定しましたか？それはビュー階層内にあり、可視ですか？

@danielbeardが示すようにデータソースを確認してください。散布図の正しいフィールド名はCPTScatterPlotFieldXとCPTScatterPlotFieldYです。

Answer 2

スキャッタプロットを設定していて、CPTPieChartFieldSliceWidthを求めるnumberForPlotメソッドでこれが意図されていますか？あなたはグリッド線をまったく見ることができますか？またはグラフ全体が空白になっていますか？