小编Rod*_*sta的帖子

我想在我的应用程序中显示一个ActivityIndi​​catorView,但是当我sync从主线程调用该方法时,应用程序崩溃并出现错误:exc_bad_instruction (code=exc_i386_invop subcode=0x0) 我正在使用xcode 8.0和swift 3

有人可以帮帮我吗？

 func POST(endpoint:NSString!,body:NSString!,vc:UIViewController? = nil)->NetworkResult{
    let result = NetworkResult()
    DispatchQueue.main.sync {
        self.displayActivityIndicator(viewController: vc)
    }
    let urlStr = self.url.appending(endpoint as String).appending(self.getHashAutenticacao() as String)
    print(urlStr)
    let request = NSMutableURLRequest(url: URL(string: urlStr)!, cachePolicy: NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData, timeoutInterval: 20)
    print(request.debugDescription)
    request.setValue("application/json", forHTTPHeaderField: "Accept")
    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
    request.httpMethod = "POST"
    request.httpBody = body.data(using: String.Encoding.utf8.rawValue, allowLossyConversion: true)

    // send the request
    var data: NSData!
    do {
        data = try NSURLConnection.sendSynchronousRequest(request as URLRequest, returning: &self.response) as NSData!
    } catch let …