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无法访问类型为[AnyHashable:Any]-Swift 4的值

userinfo push-notification swift ios

Saurabh Divesh singh · 技术社区 · 6 年前

我试图从类型为[anyhashable:any]的变量访问特定的值,但是在访问任何值时,我会收到一个错误。关于这个问题,我浏览过互联网,但没有得到任何具体的解决方案。那么有没有其他的方法来访问它们呢?请帮忙并提前感谢。

函数,在其中我得到一个错误

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        if let messageID = userInfo[gcmMessageIDKey] {
            print("Message ID: \(messageID)")
        }
        //Print full message
        print(userInfo)

        guard let aps = userInfo[AnyHashable("gcm.notification.data")],
            let data = aps["filters"] as! String else { // Getting the error here
                return
        }
        print(aps)
        completionHandler(UIBackgroundFetchResult.newData)
    }

在打印用户信息时获取的数据

[AnyHashable("gcm.notification.data"): {"filters":"fjjnbbx zjbxzj","history":"dsfdxf","message":"value1","source":"message source"}]

2 回复 | 直到 6 年前

Saurabh Divesh singh 6 年前

我解决了这个问题,因为我收到的信息类型是nsstring(字符串中的json)而不是nsdictionary/[string:any]。我提供了解决我下面问题的工作代码-

if let notificationData = userInfo["gcm.notification.data"] as? NSString {
                var dictionary : NSDictionary?
                if let data = notificationData.data(using: String.Encoding.utf8.rawValue) {
                    do {
                        dictionary = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary
                        print("DICTIONARY : \(dictionary)")
                        if let dict = dictionary {
                            print(dict["alert_message"] as? String)
                            // ..... and so on
                        }
                    } catch let error as NSError {
                        print("Error: \(error)")
                    }
                }
            }

piet.t Charis A. 6 年前

从[AnyHashable(“gcm.notification.data”)]获取数据

if let aps = userInfo["aps"] as? NSDictionary, let notificationData = userInfo["gcm.notification.data"] as? NSString {

          var dictonary:NSDictionary?
            if let data = notificationData.data(using: String.Encoding.utf8.rawValue) {
                do {
                    dictonary = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary

                    if let alertDictionary = dictonary {
                        print(alertDictionary)
                    }
                } catch{
                    print(error)
                }