iOS-Charts error: Thread1: EXC_BAD_ACCESS (code=2, address=0x2a0c220)

iOS-Charts error: Thread1: EXC_BAD_ACCESS (code=2, address=0x2a0c220)

所以,我正在学习 AppCoda 上的 iOS-Charts 教程,我完全遵循了它,然后当我遇到问题时,我也复制了代码以完全匹配它们。

问题是,当我尝试创建饼图时,然后 运行 它。我收到错误:

Thread1: EXC_BAD_ACCESS (code=2, address=0x2a0c220)

然后应用程序崩溃了。当它崩溃时,它会突出显示这一行:

pieChartView.data = pieChartData

屏幕截图如下:

这是来自 viewcontroller.swift 的完整代码:

import UIKit
import Charts

class ViewController: UIViewController {

@IBOutlet weak var pieChartView: PieChartView!

func setChart(dataPoints: [String], values: [Double]) {

    var dataEntries: [ChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = ChartDataEntry(value: values[i], xIndex: i)
        dataEntries.append(dataEntry)
    }

    let pieChartDataSet = PieChartDataSet(yVals: dataEntries, label: "Units Sold")
    let pieChartData = PieChartData(xVals: dataPoints, dataSet: pieChartDataSet)
    pieChartView.data = pieChartData

    var colors: [UIColor] = []



    for i in 0..<dataPoints.count {
        let red = Double(arc4random_uniform(256))
        let green = Double(arc4random_uniform(256))
        let blue = Double(arc4random_uniform(256))

        let color = UIColor(red: CGFloat(red/255), green: CGFloat(green/255), blue: CGFloat(blue/255), alpha: 1)
        colors.append(color)
    }

    pieChartDataSet.colors = colors




}

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

    let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]
    let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0]

    setChart(months, values: unitsSold)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

看来您可能错过了这一部分:

Next drag a View onto the Bar Chart View Controller and pin its edges as shown. This View is a child of the main View in the controller.

您需要在您的视图控制器中创建一个 UIView,然后 link 将其添加到 @IBOutlet weak var pieChartView: PieChartView!在你的代码中。

然后就可以了。 它看起来像一个不错的图书馆。

希望对您有所帮助。请告诉我们。

编辑:

转到故事板上的视图控制器并拖动一个 UIView。然后 select UIView 并在身份检查器中将其 class 设置为 PieChartView。打开 ViewController swift 文件,右键单击顶部 @IBOutlet 行上的小圆圈,然后按住右键将其拖到刚刚创建的 UIView 上,然后离开。现在您将 outlet 连接到代码,它会将 pieChartView var 识别为一个对象,而不是当前的 nil。

我用相同的代码遇到了完全相同的错误。

正如 smozgur 所建议的,我检查了 Iboutlet 连接,但似乎连接正常

问题是我设置了错误的模块,所以也要检查 "module target" 我希望这对某人有帮助:)