swift - 关闭 UIAlertController 后如何重新加载 UIView

Question

我尝试使用 https://github.com/CoreCharts/CoreCharts 制作条形图我有一个按钮，它使用 textField 调用 UIAlertController。单击提交按钮后，新数据将添加到数组中。我需要图表才能重新启动。

@IBAction func newWeightButton(_ sender: Any) {
        //updateGraph()
        let alert = UIAlertController(title: "Enter your new weight", message: nil, preferredStyle: .alert)
        alert.addTextField()


        let submitAction = UIAlertAction(title: "Add", style: .default) { [unowned alert] _ in
            let textField = alert.textFields![0]
            textField.keyboardType = UIKeyboardType.numberPad
            textField.becomeFirstResponder()
            let answer = Double(textField.text!)
            self.weightArr.append(answer!)
            print(self.weightArr)
            self.loadCoreChartData()
        }

        alert.addAction(submitAction)

        present(alert, animated: true)

}



func loadCoreChartData() -> [CoreChartEntry] {

        return getWeightList()

    }
func getWeightList()->[CoreChartEntry] {
    var allResults = [CoreChartEntry]()


    //let days = ["Mon","Tue","Wed","Thur","Fri"]
    let plateNumber = [80,75,90,88,84]
    var count = self.weightArr.count
    for index in 0..<count {

        let newEntry = CoreChartEntry(id: "\(self.weightArr[index])",
            barTitle: "Day",
            barHeight: Double(self.weightArr[index]),
            barColor:  UIColor(red: 0, green: 122/255, blue: 1, alpha: 1))


        allResults.append(newEntry)

    }

Answer 1

对于 CoreCharts，在图表上调用 reload()。

通常，在 iOS 中，设置 UIView 的属性就足以让它更新，但是对于使用某种类型的数据源(如表格、 Collection View 和核心图表)的 View ，通常有某种 reload...() 函数来告诉 View 数据源已更改。