Json序列化Swift 3类型错误 [英] Json Serialisation Swift 3 type error

问题描述

我正在使用以下代码从推送通知中接收自定义数据，并且出现以下错误:

I am using the following code to receive custom data from a push notification and I get the following error:

无法将类型'__NSArrayM'(0x1b0776cf0)的值强制转换为'NSDictionary'(0x1b0777128).

Could not cast value of type '__NSArrayM' (0x1b0776cf0) to 'NSDictionary' (0x1b0777128).

在以下行上:

let jsonData = try? JSONSerialization.jsonObject(with: (customDataString?.data(using: String.Encoding.utf8))!, options: JSONSerialization.ReadingOptions.mutableContainers) as![String: Any]

如何解决此错误?

func onPushAccepted(_ pushManager: PushNotificationManager!, withNotification pushNotification: [AnyHashable : Any]!, onStart: Bool) {
    print("Push notification accepted: \(pushNotification!)")

    let customDataString = pushManager.getCustomPushData(pushNotification)

    if customDataString != nil {
        let jsonData = try? JSONSerialization.jsonObject(with: (customDataString?.data(using: String.Encoding.utf8))!, options: JSONSerialization.ReadingOptions.mutableContainers) as! [String: Any]

        print("*** \(jsonData?["test"]!)")
    }

推荐答案

读取错误:

无法将期望类型的数组的值强制转换为提供类型的字典

Could not cast value of expected type Array to offered type Dictionary

这意味着您的JSON是一个数组，所以

That means your JSON is an array, so

if let customDataString = pushManager.getCustomPushData(pushNotification) {   
   let data = customDataString.data(using: utf8)!
   let jsonData = try? JSONSerialization.jsonObject(with: data) as! [[String:Any]]
   ...

您可以省略options参数，因为.mutableContainers在Swift中还是没用的.

You can omit the options parameter, because .mutableContainers is useless in Swift anyway.

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