为什么 moveViewToX() 不会将我的显示移动到条形图中的最后一个值？-迅速

Question

我是Swift的新手，我正在尝试创建条形图。我设法创建一个图表，但由于某种原因moveViewToX()不像预期的那样工作-它不滚动到最后的x值。下面是我创建图表的相关函数:

func createBarView() {
// Set basic parameters
barChartView.xAxis.labelTextColor = .black
barChartView.leftAxis.labelTextColor = .black
barChartView.leftAxis.axisMinimum = 0
barChartView.xAxis.labelPosition = XAxis.LabelPosition.bottom
barChartView.xAxis.labelRotationAngle = 0
barChartView.xAxis.granularity = 1
barChartView.xAxis.labelFont = UIFont.systemFont(ofSize: 20.0, weight: .regular)
barChartView.xAxis.drawGridLinesEnabled = false
barChartView.rightAxis.drawGridLinesEnabled = false
barChartView.leftAxis.drawGridLinesEnabled = false
barChartView.rightAxis.enabled = false
barChartView.leftAxis.enabled = false
barChartView.xAxis.labelPosition = .bottom
barChartView.clipsToBounds = true
barChartView.layer.cornerRadius = 10
barChartView.legend.enabled = false
barChartView.animate(yAxisDuration: 1.3, easingOption: .easeInOutQuart)
barChartView.scaleYEnabled = false
barChartView.scaleXEnabled = false
barChartView.pinchZoomEnabled = false
barChartView.doubleTapToZoomEnabled = false
//Get X (days) and Y data (calories)
let count = realm.objects(WorkoutData.self).count
for i in 0 ..< count {
let graphDates = realm.objects(WorkoutData.self)[i].date
allDates.append(graphDates) 
let calendarDate = Calendar.current.dateComponents([.day, .year, .month], from: graphDates)
graphDays.append(String(calendarDate.day!)) // Get days array for xAxis

let graphCalories = realm.objects(WorkoutData.self)[i].calories
visosKalorijos.append(graphCalories) // Get calories array for yAxis
}
//Supply data for BarChartDataEntry
var entries = [BarChartDataEntry]()
for i in 0 ..< count { // dataPoints
let dataEntry = BarChartDataEntry(x: Double(i), y: Double(visosKalorijos[i]))
entries.append(dataEntry) //// Get x:y data
}
//Set labels of xAxis (to show days of the month)
barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values: graphDays)
// Create dataset
let set = BarChartDataSet(entries: entries, label: "-")
set.colors = ChartColorTemplates.solid()
set.valueFont = UIFont.systemFont(ofSize: 16)
let data = BarChartData(dataSet: set)
data.barWidth = Double(0.4)
barChartView.data = data
// Set visibility
barChartView.setVisibleXRangeMaximum(7)
barChartView.moveViewToX(Double(count)) 
}

当函数执行时，我只能看到最多17天，但如果我滚动，x轴上有更多的天。

加载视图后，我需要滚动到结束

最后一部分-//设置可见性是问题所在-它不会自动滚动到最后一个x值。我做错了什么?谢谢你的帮助。

Answer 1

一段时间后我明白了。最后一步//设置可见度需要延迟0.1s:

barChartView.setVisibleXRangeMaximum(7)
let when = DispatchTime.now() + 0.1
DispatchQueue.main.asyncAfter(deadline: when) {
self.barChartView.moveViewToX(Double(self.count))
}

希望这对将来的人有帮助:)