Cannot subscript a value of type '[NSObject : AnyObject]' with an index of type 'String' in swift4

Question

I have the following method:

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
    //print(userInfo)
    // Print APS.
    let aps = userInfo["aps"]
    let itemId = aps!["category"] as! String
    print("ITEM ID: \(itemId)")
    let temp = Int(itemId)
    if (temp > 0) {
        print("handle item details”)
    } else {
        print("open home")
    }
}

The line let aps = userInfo["aps"] gives the following error

Cannot subscript a value of type '[NSObject : AnyObject]' with an index of type 'String'

Start by using the proper signature for `didReceiveRemoteNotification`. Please review the UIApplicationDelegate documentation. — rmaddy, Jul 20 '18 at 17:42
Possible duplicate of [Cannot subscript a value of type '\[NSObject : AnyObject\]' with an index of type 'String'](https://stackoverflow.com/questions/50141190/cannot-subscript-a-value-of-type-nsobject-anyobject-with-an-index-of-type) — Satachito, Jul 20 '18 at 17:43

Shehata Gamal · Accepted Answer · 2018-07-20T17:49:57.493

2

You can try

 func application(_ application: UIApplication, 
   didReceiveRemoteNotification userInfo: [AnyHashable : Any], 
    fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)

    if let aps = userInfo["aps"] as? [String:Any] {

    }
 }

//

OR

func  application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {}

edited Jul 20 '18 at 17:49

answered Jul 20 '18 at 17:38

Shehata Gamal

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I did and get the following error : Cannot subscript a value of type '[NSObject : AnyObject]' with an index of type 'String' – Amira Elsayed Ismail Jul 20 '18 at 17:40
Need to cast userInfo itself as? [ String: [ String: String ] ] – Satachito Jul 20 '18 at 17:49
1

@Satachito if so it would be **as? [String:[String:Any]]** , always we don't know the deep-most type of the value – Shehata Gamal Jul 20 '18 at 17:59
@Sh_Khan Amira needs to cast aps!["category"] as! String, so, it must be [ String: [ String: String ] ] – Satachito Jul 20 '18 at 18:02
@Satachito and who told you that there is no other values ?? – Shehata Gamal Jul 20 '18 at 18:03
@Sh_Khan I don't care, I only answer to make this question work. – Satachito Jul 20 '18 at 18:04

score 1 · Answer 2 · edited Jul 20 '18 at 18:22

1

I suggest you to define your variables type if you don't know what type it will get.

You need to declare aps by your expected type:

let aps : [String:Any]?

In this case, if you couldn’t initialize aps variable, Xcode will tell you how you can do your job. Not always, but most of time.

edited Jul 20 '18 at 18:22

rmaddy

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answered Jul 20 '18 at 18:13

Mohammad Reza Koohkan

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Cannot subscript a value of type '[NSObject : AnyObject]' with an index of type 'String' in swift4

2 Answers2