iOS Core将CPTAxisLabel与CPTPlotalignment
请看下面这张图片。 我有附件。 我的问题与CPTAxisLabel标签。 它们被放置在刻度线下，但是它们不会被放置在CPTPlot 。
如何添加左偏移量到这个标签？ 我需要将我的标签放在CPTPlot对象的中间。
（更新：）
-(void)configureGraph { NSInteger max = 0; for (NSNumber *number in self.values) { NSInteger num = [number integerValue]; if (num > max) { max = num; } } CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:self.bounds]; graph.plotAreaFrame.masksToBorder = NO; self.hostedGraph = graph; graph.paddingBottom = 80.0f; graph.paddingLeft = 0.0f; graph.paddingTop = 50.0f; graph.paddingRight = 0.0f; CGFloat xMin = -0.5f; CGFloat xMax = [self.titles count]; if (xMax < 7.0) { xMax = 7.0; } CGFloat yMin = 0.0f; CGFloat yMax = max + 25; CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace; plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(xMin) length:CPTDecimalFromFloat(xMax)]; plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(yMin) length:CPTDecimalFromFloat(yMax)]; //graph.backgroundColor = [[UIColor grayColor] CGColor]; //graph.plotAreaFrame.fill = [CPTFill fillWithColor:[CPTColor redColor]]; } -(void)configurePlots { CPTBarPlot *plot = [[CPTBarPlot alloc] init]; //plot.barOffset = CPTDecimalFromFloat(0.30); plot.fill = [CPTFill fillWithColor:[CPTColor colorWithComponentRed:190.0f/255.0f green:203.0f/255.0f blue:103.0f/255.0f alpha:1.0]]; //plot.barWidth = CPTDecimalFromDouble(0.75); plot.lineStyle = nil; plot.barCornerRadius = 1.0; plot.dataSource = self; plot.delegate = self; CPTGraph *graph = self.hostedGraph; [graph addPlot:plot toPlotSpace:graph.defaultPlotSpace]; } #pragma mark - CPTPlotDataSource methods -(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot { return [self.titles count]; } -(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { if ((fieldEnum == CPTBarPlotFieldBarTip) && (index < [self.titles count])) { return [self.values objectAtIndex:index]; } return [NSDecimalNumber numberWithUnsignedInteger:index]; } -(CPTLayer *)dataLabelForPlot:(CPTPlot *)plot recordIndex:(NSUInteger)idx { plot.labelOffset = 0; CPTMutableTextStyle *style = [CPTMutableTextStyle textStyle]; style.color = [[CPTColor whiteColor] colorWithAlphaComponent:1]; style.fontName = @"Helvetica-Bold"; style.fontSize = 12.0f; NSString *valueString = [NSString stringWithFormat:@"%@", [self.values objectAtIndex:idx]]; return [[CPTTextLayer alloc] initWithText:valueString style:style]; } - (void)configureAxes { CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.hostedGraph.axisSet; axisSet.xAxis.hidden = YES; axisSet.yAxis.hidden = YES; CPTMutableTextStyle *style = [CPTMutableTextStyle textStyle]; style.color = [[CPTColor whiteColor] colorWithAlphaComponent:1]; style.fontName = @"Helvetica-Bold"; style.fontSize = 12.0f; NSMutableArray *labels = [[NSMutableArray alloc] initWithCapacity:5]; int idx =0; for (NSString *string in self.titles) { CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:string textStyle:style]; label.rotation = M_PI/2; label.tickLocation = CPTDecimalFromInt(idx); label.offset = 10.0f; [labels addObject:label]; idx+=1; } axisSet.xAxis.axisLabels = [NSSet setWithArray:labels]; }
将barOffset设置为零（0），并使条位置与刻度位置相同，或调整由数据源返回的条位置，以考虑barOffset 。
CPTAxis类有一个属性labelOffset，根据文档，它是“刻度线和标签之间的偏移距离”。
从CPTAxis类有很多自定义标签的方法，你应该检查： https ://core-plot.googlecode.com/hg-history/efa73ee50d8edfd0e1d4294cf4bd2c07d9f8af77/documentation/html/iOS/interface_c_p_t_axis.html