TKChartDataPoint不符合预期的类型序列

Question

I am starting out with Telerik and tried to do the demo project provided.

As I am trying to declare a TKChartDataPoint it gives out an error:

Code Snippet:

class ViewController: UIViewController {

let x = 10
let y = 10

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let chart = TKChart(frame: self.view.bounds.insetBy(dx: 15, dy: 15))
    chart.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
    self.view.addSubview(chart)

    var randomNumericData = [TKChartDataPoint]()
    for i in 0..<10 {

        //Error Here
        randomNumericData += TKChartDataPoint(x: i, y: Double(arc4random() % 100))

    }

    chart.addSeries(TKChartLineSeries(items: randomNumericData))

    chart.title.isHidden = false
    chart.title.text = "This is a chart demo"
    chart.legend.isHidden = false

    chart.allowAnimations = true
}

Answer 1

You should just use append to add your object to the array:

randomNumericData.append(TKChartDataPoint(x: i, y: Double(arc4random() % 100)))

You can use += if you really want, but randomNumericData is an Array so to add to it with + or += , the added part should also be an array:

randomNumericData += [TKChartDataPoint(x: i, y: Double(arc4random() % 100))]

In my opinion, the first solution is preferred.