![](/img/trans.png)
[英]Swift Firebase “Cannot assign value of type 'Information' to type 'NSDictionary?'”
[英]Cannot assign value of type 'NSDictionary?' to type 'String?'
下面是我从API获取响应的代码(Swift 4.2.1),但是在调用时显示了一些错误,
无法分配“ NSDictionary”类型的值? 键入“字符串?”
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
return
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
do {
let jsonResponse = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary
print(jsonResponse!)
responsevalue = jsonResponse
let alert1 = UIAlertController(title: "Alert", message: self.responsevalue, preferredStyle: UIAlertController.Style.alert)
let action1 = UIAlertAction(title: "Ok",style: .default)
{(ACTION)in
}
alert1.addAction(action1)
self.present(alert1, animated: true, completion: nil)
}catch let parsingError {
print("Error", parsingError)
let alert1 = UIAlertController(title: "Alert", message: parsingError as? String, preferredStyle: UIAlertController.Style.alert)
let action1 = UIAlertAction(title: "Ok",style: .default)
{(ACTION)in
}
alert1.addAction(action1)
self.present(alert1, animated: true, completion: nil)
}
}
task.resume()
不要使用NSDictionary
。 使用[String: Any]
。 您需要从字典中获取消息字符串以显示在警报中。
let jsonResponse = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
print(jsonResponse)
responsevalue = jsonResponse
guard let message = jsonResponse["msg"] as? String else {//Use the key from json
return
}
let alert1 = UIAlertController(title: "Alert", message: message, preferredStyle: .alert)
在其他部分,请使用parsingError.localizedDescription而不是parsingError
let alert1 = UIAlertController(title: "Alert", message: parsingError.localizedDescription, preferredStyle: .alert)
如错误所示, Cannot assign value of type 'NSDictionary?' to type 'String?'
Cannot assign value of type 'NSDictionary?' to type 'String?'
。 您正在将NSDictionary分配给类型为String的变量。
您需要将responseString
的原始声明更改为NSDictionary或另一个变量以存储NSDictionary。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.