小编Joh*_*now的帖子

如何在xcode中通过ios-charts创建水平条形图？我用类Horizo​​ntalBarChartView创建了View

@IBOutlet weak var horChart: HorizontalBarChartView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    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)

}

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 chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Units Sold")
    let chartData = BarChartData(xVals: dataPoints, …

我正在尝试使用我的服务器端的收据验证.一切都很好,但有时我看到很奇怪:10次验证是可以的,但在11我得到21002错误.我不知道该怎么办.当我在启动应用程序后第一次验证收据时,有时会收到错误21002.

应用方面:

func validateReceipt(productID: String) {

    let receipt = NSData(contentsOfURL: NSBundle.mainBundle().appStoreReceiptURL!)!

    let receiptdata = receipt.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))

    let request = NSMutableURLRequest(URL: NSURL(string: "my_server_url")!)

    let session = NSURLSession.sharedSession()
    request.HTTPMethod = "POST"

    request.HTTPBody = receiptdata.dataUsingEncoding(NSUTF8StringEncoding)

    let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in

        let json = try! NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) as? NSDictionary

        if (error != nil) {
            print(error!.localizedDescription)
            let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)
            print("Error could not parse JSON: '\(jsonStr)'")
        }
        else {
            if let parseJSON = json { …