Question

我有一个名为EXC Bad Instruction的错误。有人可以帮我搞清楚吗？出口小组说：

App Transport Security已阻止明文HTTP（http：//）资源加载，因为它不安全。可以通过应用程序的Info.plist文件配置临时例外。致命错误：在解包可选值时意外发现nil

这是代码。

import Foundation

let kNotificationStocksUpdated = "stocksUpdated"

class StockManagerSingleton {

//Singleton Init
class var sharedInstance : StockManagerSingleton {
    struct Static {
        static let instance : StockManagerSingleton = StockManagerSingleton()
    }
    return Static.instance
}

/*!
* @discussion Function that given an array of symbols, get their stock prizes from yahoo and send them inside a NSNotification UserInfo
* @param stocks An Array of tuples with the symbols in position 0 of each tuple
*/
func updateListOfSymbols(stocks:Array<(String,Double)>) ->() {

    //1: YAHOO Finance API: Request for a list of symbols example:
    //http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.quotes where symbol IN ("AAPL","GOOG","FB")&format=json&env=http://datatables.org/alltables.env

    //2: Build the URL as above with our array of symbols
    var stringQuotes = "(";
    for quoteTuple in stocks {
        stringQuotes = stringQuotes+"\""+quoteTuple.0+"\","
    }
    stringQuotes = stringQuotes.substringToIndex(stringQuotes.endIndex.predecessor())
    stringQuotes = stringQuotes + ")"

    let urlString:String = ("http://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.quotes where symbol IN "+stringQuotes+"&format=json&env=http://datatables.org/alltables.env").stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
    let url : NSURL = NSURL(string: urlString)!

    let request: NSURLRequest = NSURLRequest(URL:url)
    let config = NSURLSessionConfiguration.defaultSessionConfiguration()
    let session = NSURLSession(configuration: config)

    //3: Completion block/Clousure for the NSURLSessionDataTask
    let task : NSURLSessionDataTask = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in

        do {
            if let jsonDict = try NSJSONSerialization.JSONObjectWithData(data!, options:.MutableContainers) as? NSDictionary {
                // Success block...
                //5: Extract the Quotes and Values and send them inside a NSNotification
                let quotes:NSArray = ((jsonDict.objectForKey("query") as! NSDictionary).objectForKey("results") as! NSDictionary).objectForKey("quote") as! NSArray
                dispatch_async(dispatch_get_main_queue(), {
                    NSNotificationCenter.defaultCenter().postNotificationName(kNotificationStocksUpdated, object: nil, userInfo: [kNotificationStocksUpdated:quotes])
                })
            }
        } catch {
            print(error)
        }

    })


    //6: DONT FORGET to LAUNCH the NSURLSessionDataTask!!!!!!
    task.resume()
}
}

有问题的一行是，

if let jsonDict = try NSJSONSerialization.JSONObjectWithData(data!, options:.MutableContainers) as? NSDictionary

Answer 1

App Transport Security导致您的请求失败，因为您请求的网址不使用https。然后在完成处理程序中，数据为nil，这可能是导致异常的原因，因为你强制解包它。

在您尝试使用它来停止异常之前，您需要添加一项检查以确保数据不是nil。

要使网络请求生效，您需要使用https网址或停用App Transport Security

EXC错误指令错误

1 个答案: