iOS 图表，删除底部由 xAxis 标签创建的额外 space

Question

我有一个用 iOS 图表创建的垂直垂直条形图。我的问题是，出于某种原因，每当我运行程序时，图表都不会从上到下填满它所在的视图。 我特别想修复一个小 space 栏底部和 UIView 底部之间的事实。我怎样才能删除这个 space 使栏的底部与 UIView 的底部完全对齐？ (不需要间隙)

这是我的代码：

    barChartView.xAxis.labelPosition = .top 
    barChartView.xAxis.drawGridLinesEnabled = false
    barChartView.xAxis.drawAxisLineEnabled = false
    barChartView.leftAxis.drawGridLinesEnabled = false
    barChartView.leftAxis.drawAxisLineEnabled = false
    barChartView.rightAxis.drawAxisLineEnabled = false
    barChartView.rightAxis.drawGridLinesEnabled = false
    barChartView.rightAxis.enabled = false
    barChartView.leftAxis.enabled = false
    barChartView.xAxis.labelTextColor = UIColor.white
    barChartView.data?.setDrawValues(false)
    barChartView.xAxis.labelFont = UIFont(name: "HelveticaNeue-Bold", size: 12.0)!
    barChartView.legend.enabled = false
    barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values:xValues)
    barChartView.xAxis.granularity = 1
    barChartView.animate(xAxisDuration: 1.0, yAxisDuration: 1.0, easingOption: .easeInQuint)
    barChartView.isUserInteractionEnabled = false
    barChartView.barData?.barWidth = 0.65

这是问题的图片...我需要去掉条形底部和红色之间的间隙 space。图形所在的 UIView（与红色视图不同）向下延伸到红色视图的边框。

Answer 1

试试这个：

 barChartView.minOffset = 0.0

如果这不起作用，也添加它。

barChartView.extraBottomOffset = -10

Answer 2

I can't discover special options in BarChartView to resolve your problem. But I can suggest another way. You can embed your barChartView into another view and set a vertical space constraint from between bottom of your barChartView to bottom a superview with a negative value, also set clipToBounds = true for the superview. So the bottom of barChartView will be below the bottom of superview and will be cut.

View after embedding (yellow background - superview, white - barChartView).

View after bottom constraint was set to -14.

Answer 3

能够根据 phone 显示的大小以编程方式调整底部约束来解决我的问题。

我将此代码添加到 viewWillAppear 中，我将继续对其余 iPhone 尺寸执行此操作，而不仅仅是 Xs:

if UIScreen.main.bounds.height == 896{
        print("Xs Max")
        bottomConstraintGraph.constant = -31.5 // bottomConstraintGraph is the constraint connected from the bottom of the graph's view to the superview and changed here through an outlet connection.
}

iOS 图表，删除底部由 xAxis 标签创建的额外 space

iOS Charts, Remove extra space created by xAxis Labels at bottom

ios

swift

xcode

uiview

ios-charts