Question

我在iOS应用程序中使用Core Plot并希望格式化轴的步骤。我得到的只是0.5的步骤，我不知道还有什么可以改变。我的刻度位置应为5,10,15和20。

以下是绘制轴的代码：

-(void) addAxis{

    // Create grid line styles
    CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle];
    majorGridLineStyle.lineWidth = 1.0f;
    majorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.75];

    NSSet *majorTickLocations = [NSSet setWithObjects:[NSDecimalNumber zero],
                                 [NSDecimalNumber numberWithUnsignedInteger:5],
                                 [NSDecimalNumber numberWithUnsignedInteger:10],
                                 [NSDecimalNumber numberWithUnsignedInteger:15],
                                 [NSDecimalNumber numberWithUnsignedInteger:20],
                                 nil];

    // Create axes
    CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet;
    CPTXYAxis *x = axisSet.xAxis;
    {
        x.labelingPolicy = CPTAxisLabelingPolicyLocationsProvided;
        x.tickDirection = CPTSignNone;
        x.majorTickLocations = majorTickLocations;
        x.labelOffset = 6.0;
        x.labelRotation = M_PI/2;
        x.visibleRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(19.0f)];
        x.gridLinesRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(30.0f)];
        x.title = @"Jahre";
        x.titleOffset = 35.0f;
        x.titleLocation = CPTDecimalFromFloat(x.visibleRange.lengthDouble / 2.0);
        x.plotSpace = self.barPlotSpace;
    }

    CPTXYAxis *y = axisSet.yAxis;
    {
        y.labelingPolicy = CPTAxisLabelingPolicyLocationsProvided;
        y.majorTickLocations = majorTickLocations;
        y.minorTicksPerInterval = 0;
        y.preferredNumberOfMajorTicks = 8;
        y.majorGridLineStyle = majorGridLineStyle;
        y.axisLineStyle = nil;
        y.majorTickLineStyle = nil;
        y.minorTickLineStyle = nil;
        y.labelOffset = 10.0;
        y.visibleRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(30.0f)];
        y.gridLinesRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0f) length:CPTDecimalFromFloat(18.5f)];
        y.title = @"Sparbetrag";
        y.titleOffset = 40.0f;
        y.titleLocation = CPTDecimalFromFloat(y.visibleRange.lengthDouble / 2.0);
        y.plotSpace = barPlotSpace;
    }

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

Answer 1

找到解决方案：应用主题会改变绘图的绘画行为。如果我不申请主题 - 一切都很好。

因为这不是很直观。我希望主题只能改变颜色，或者某些方面可以被覆盖。

Answer 2

该代码应该可以正常工作 - 最终会在0,5,10,15和20处显示刻度线和标签。visibleRange和gridLinesRange的设置可能不正确 - 将它们保留为默认值nil，使轴和网格线延伸绘图区域的整个宽度和高度。

如果要更改标签的数字格式，请将labelFormatter设置为新的NSNumberFormatter对象，以配置所需的数字格式。

核心情节：勾选间隔

2 个答案: