Question

我正在尝试创建一个带有服务器连接的页面。

一个简单的POST（电子邮件和密码字段），在回复时，我需要向用户显示警告。

此行会导致异常：

self.present(alerta2, animated:true, completion:nil)

这是我的代码：

request.httpMethod = "POST" // Compose a query string
let postString = "email=" + userEmail + "&password=" + userPassword
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
    if error != nil {
        self.mostraAlerta(mensagem: "Ocorreu um erro!")
        return
    }

    // Let's convert response sent from a server side script to a NSDictionary object:
    do {
        let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
        // print(json)
        if let parseJSON = json {
            let status = parseJSON["status"] as? String
            let msg = parseJSON["msg"] as? String
            let titulo = parseJSON["titulo"] as? String
            switch status {
            case "0"?:
                let alerta2 = UIAlertController(title: titulo, message: msg!, preferredStyle: .alert)
                let okAction = UIAlertAction(title: "OK", style: .default) { action in
                    self.dismiss(animated: true, completion: nil)
                }
                alerta2.addAction(okAction)
                self.present(alerta2, animated: true, completion: nil)
                // print("Status: OK")
                break
            case "1"?:
                print("Status: " + msg!)
                break
            default:
                print("Status: N/D")
                break
            }
            // print("Status: \(status)")
        }
    } catch {
        print(error)
    }
}
task.resume()

例外：

错误：

libsystem_kernel.dylib`__pthread_kill：0x110b48d38
  ＆lt; + 0＆gt;：movl $ 0x2000148，％eax; imm = 0x2000148 0x110b48d3d
  ＆lt; + 5＆gt ;: movq％rcx，％r10 0x110b48d40
  ＆lt; + 8＆gt;：系统调用 - ＆gt; 0x110b48d42
  ＆lt; + 10＆gt;：jae 0x110b48d4c; 1 + 20 - ; 0x110b48d44
  ＆lt; + 12＆gt;：movq％rax，％rdi 0x110b48d47
  ＆lt; + 15＆gt;：jmp 0x110b41caf; cerror_nocancel 0x110b48d4c
  ＆lt; + 20＆gt;：retq 0x110b48d4d
  ＆lt; + 21＆gt;：nop 0x110b48d4e
  ＆lt; + 22＆gt;：nop 0x110b48d4f
  ＆lt; + 23＆gt;：nop

Answer 1

我刚收到错误和修复。

错误：

***由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：' - [UIKeyboardTaskQueue waitUntilAllTasksAreFinished]只能从主线程中调用。

解决方案：

OperationQueue.main.addOperation {
    self.present(alerta2, animated:true, completion:nil)
}

POST请求后self.present不起作用

1 个答案: