Coreplot条形图问题在正确的位置显示代号？

Question

我正在研究iphone条形图应用程序。我没有收到按照该股票价值的标签，如下面的图片：

barChart = [[CPTXYGraph alloc] initWithFrame:CGRectZero]; 
CPTTheme *theme = [CPTTheme themeNamed:kCPTStocksTheme]; 
[barChart applyTheme:theme]; 
CPTGraphHostingView *hostingView =(CPTGraphHostingView *)self.view; 
//[self.scrollview addSubview:hostingView]; 
hostingView.hostedGraph = barChart; 

// Border 
barChart.plotAreaFrame.borderLineStyle = nil; 
barChart.plotAreaFrame.cornerRadius = 10.0f; 

// Paddings 
barChart.paddingLeft = 0.0f; 
barChart.paddingRight = 0.0f; 
barChart.paddingTop = 0.0f; 
barChart.paddingBottom = 0.0f; 

barChart.plotAreaFrame.paddingLeft = 70.0; 
barChart.plotAreaFrame.paddingTop = 20.0; 
barChart.plotAreaFrame.paddingRight = 20.0; 
barChart.plotAreaFrame.paddingBottom = 80.0; 

// Graph title 
barChart.title = @"Statistics"; 
CPTMutableTextStyle *textStyle = [CPTTextStyle textStyle]; 
textStyle.color = [CPTColor greenColor]; 
textStyle.fontSize = 20.0f; 
textStyle.textAlignment = CPTTextAlignmentCenter; 
barChart.titleTextStyle = textStyle; 
barChart.titleDisplacement = CGPointMake(0.0f, -20.0f); 
barChart.titlePlotAreaFrameAnchor = CPTRectAnchorTop; 

// Add plot space for horizontal bar charts 
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)barChart.defaultPlotSpace; 
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(15.0f)]; 
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(20.0f)]; 
plotSpace.globalXRange=[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(20.0f)]; 
    plotSpace.globalYRange=[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(20.0f)]; 
plotSpace.allowsUserInteraction=TRUE; 



CPTXYAxisSet *axisSet = (CPTXYAxisSet *)barChart.axisSet; 
CPTXYAxis *x = axisSet.xAxis; 
x.axisLineStyle = nil; 
x.majorTickLineStyle = nil; 
[x setMinorTickLineStyle:CPTLinearBlendingMode]; 
x.majorIntervalLength = CPTDecimalFromString(@"10"); 
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0"); 
x.title = @"Quiz Date"; 
x.majorTickLength=10.0f; 
x.titleLocation = CPTDecimalFromFloat(7.5f); 
x.titleOffset = 60.0f; 
x.labelOffset=5.0f; 

// Define some custom labels for the data elements 
x.labelRotation = M_PI/2; 
x.labelingPolicy = CPTAxisLabelingPolicyNone; 
//NSDecimalNumber add=0; 


CPTPlotRange *globalxrange=[CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0f) length:CPTDecimalFromDouble(1000.0f)]; 
plotSpace.globalXRange=globalxrange; 

NSMutableArray *customTickLocations = [[NSMutableArray alloc]init]; 
NSDecimalNumber *num = nil; 
for (int i=0;i<[arr count];i++) { 
    num = (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:i*5]; 
    [customTickLocations addObject:num]; 
} 

NSArray *xAxisLabels =[[NSMutableArray alloc]initWithArray:labelValue]; //[NSArray arrayWithObjects:@"Label A", @"Label B", @"Label C", @"Label D", @"Label E", nil]; 
NSUInteger labelLocation = 0; 
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]]; 
for (NSNumber *tickLocation in customTickLocations) { 
    CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle]; 
    newLabel.tickLocation = [tickLocation decimalValue]; 
    newLabel.offset =x.labelOffset+ x.majorTickLength ; 
    newLabel.rotation =M_PI/2; 
    NSLog(@"-=-=-=--=-=-=- %d",x.labelOffset+ x.majorTickLength); 
    [customLabels addObject:newLabel]; 
    [newLabel release]; 
} 
x.axisLabels = [NSSet setWithArray:customLabels]; 





CPTXYAxis *y = axisSet.yAxis; 
y.labelingPolicy=CPTAxisLabelingPolicyAutomatic; 
y.axisLineStyle = nil; 
y.majorTickLineStyle = nil; 
y.minorTickLineStyle = nil; 
y.majorIntervalLength = CPTDecimalFromString(@"1"); 
y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"0"); 
y.title = @"No. of Questions"; 
y.titleOffset = 50.0f; 
y.titleLocation = CPTDecimalFromFloat(150.0f); 

// First bar plot 
CPTBarPlot *barPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor blueColor] horizontalBars:NO]; 
barPlot.baseValue = CPTDecimalFromString(@"0"); 
barPlot.dataSource = self; 
barPlot.barWidth=CPTDecimalFromFloat(1.0f); 
barPlot.plotRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0)          length:CPTDecimalFromDouble(x.labelOffset + x.majorTickLength)]; 
barPlot.barOffset =CPTDecimalFromFloat(1.0f); 
barPlot.barCornerRadius = 2.0f; 
barPlot.identifier = @"Bar Plot 1"; 

[barChart addPlot:barPlot toPlotSpace:plotSpace]; 
    `// barPlot.barOffset = CPTDecimalFromFloat(0.25f); 
barPlot.barCornerRadius = 2.0f; 
barPlot.identifier = @"Bar Plot 2"; 
[barChart addPlot:barPlot toPlotSpace:plotSpace];` 

// third bar plot 
barPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor redColor] horizontalBars:NO]; 
barPlot.dataSource = self; 
barPlot.barWidth=CPTDecimalFromFloat(1.0f); 
barPlot.baseValue = CPTDecimalFromString(@"0"); 
barPlot.plotRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(0.0)length:CPTDecimalFromDouble(x.labelOffset + x.majorTickLength)]; 
barPlot.barOffset =CPTDecimalFromFloat(3.0f); 
barPlot.barCornerRadius = 2.0f; 
barPlot.identifier = @"Bar Plot 3"; 
[barChart addPlot:barPlot toPlotSpace:plotSpace]; 


// arrayWithObjects:[NSDecimalNumber numberWithInt:5], [NSDecimalNumber numberWithInt:10], [NSDecimalNumber numberWithInt:15], nil];} 

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

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index `{` 
NSDecimalNumber *num = nil; 
if ([plot isKindOfClass:[CPTBarPlot class]]) { 
    switch (fieldEnum) { 
     case CPTBarPlotFieldBarLocation: 
      num = (NSDecimalNumber *)[NSDecimalNumber numberWithUnsignedInteger:index]; 
      break; 

     case CPTBarPlotFieldBarTip: 
      if ([plot.identifier isEqual:@"Bar Plot 1"]) 
       num=[NSDecimalNumber decimalNumberWithString:[totalValues objectAtIndex:index]]; 

      if ([plot.identifier isEqual:@"Bar Plot 2"]) 
       num=[NSDecimalNumber decimalNumberWithString:[correctValues objectAtIndex:index]]; 

      if ([plot.identifier isEqual:@"Bar Plot 3"]) 
       num=[NSDecimalNumber decimalNumberWithString:[wrongArray objectAtIndex:index]]; 

      break; 


     case CPTScatterPlotFieldX: 
      if ([plot.identifier isEqual:@"Bar Plot 1"]) 
       num=[NSDecimalNumber decimalNumberWithString:[totalValues objectAtIndex:index]]; 
      return num; 

      if ([plot.identifier isEqual:@"Bar Plot 2"]) 
       num=[NSDecimalNumber decimalNumberWithString:[correctValues objectAtIndex:index]]; 
       return num; 

      if ([plot.identifier isEqual:@"Bar Plot 3"]) 
       num=[NSDecimalNumber decimalNumberWithString:[wrongArray objectAtIndex:index]]; 
      return num; 

      break; 


    } 
} 

return num;`}` 

-(CPTFill *) barFillForBarPlot:(CPTBarPlot *)barPlot recordIndex:(NSNumber *)index; 
{ 
return nil; 
} 

Answer 1

设置barOffset为零要与标签一字排开的情节。设置其他人相对于那个。例如：

barPlot1.barOffset = CPTDecimalFromDouble(-1.0); 
barPlot2.barOffset = CPTDecimalFromDouble(0.0); 
barPlot3.barOffset = CPTDecimalFromDouble(1.0); 

你也将需要调整的情节空间的xRange保持第一夫妇的可见条。