如何使用swift从[Any]中访问密钥

Question

Am developing a application using swift,in my am integrating cometchat following the link https://docs.cometchat.com/ios-sdk/quick-start/ . So am fetching chat history from the server.

Now I got two(sender messages and receiver messages) nsmutablearray value from the server.

ie, var firstArr = response!["history"]! as! NSMutableArray var firstArr = response!["history"]! as! NSMutableArray

   var secondArr = response!["history"]! as! NSMutableArray

I merged two nsmuatblearray values and the result i got is:

 [
    {
        from = 1;
        id = 68;
        localmessageid = "46A9A5E5-FEEC-4588-B7D6-18E88BA68393_2";
        message = "ckeck messages";
       "message_type" = 10;
        old = 1;
        self = 1;
        sent = 1521185409000;
    }, 
    {
        from = 2;
        id = 69;
        localmessageid = "46A9A5E5-FEEC-4588-B7D6-18E88BA68393_1";
        message = "sent to thiyakarajan";
       "message_type" = 10;
        old = 1;
        self = 1;
        sent = 1521185410000;
    }
 ]

In the responses key value sent is refered as timestamp.

using that sent key(timestamp) help me to sort array in ascending order.

And also me to load message value in table view.

Thanks

Answer 1

You can access the Array in cellforrowatindexpath method of your TableView by using code like [[yourarray objectAtIndex:indexPath.row]objectForKey:@"message"] . By using this line you can access the value of message of the array at indexPath 0. Also for sorting the Array depending on timestamp please refer the below code:

NSSortDescriptor* sortOrder = [NSSortDescriptor sortDescriptorWithKey: @"sent" ascending: YES];
return [myArray sortedArrayUsingDescriptors: [NSArray arrayWithObject: sortOrder]];

We have used the same in our ReadyUI code. Please refer our ReadyUI source code and email us at support@cometchat.com if you need additional assistance.

Answer 2

It's a very bad practice working with network data like that. Especially if you want to use this data further inside of your app.

1. You need to parse the data received either in Dictionary or in your own data structure to work with it safely. There're plenty of ways to do that including JSONSerialization , Codable Protocol or even external libraries like SwiftyJSON
2. After parsing you will have your objects that you can work with without necessity of casting Any type to expected types, which brings a lot of optional checks. So let's say you have your structure called Message that contains all the data from JSON, after getting all the objects you'll have your neat [Message] array that you can pass around the application.
3. To sort array by some of the properties you simply use function sorted(by:) that is default for any collection. In your case: sortedArray = myArray.sorted(by: {$0.sent < $1.sent})
4. Now you can use this array as a dataSource for your tableView using UITableViewDataSource protocol

It's obvious that you're pretty new to iOS programming, so I'd recommend to look up for some tutorials on working with networking data. You can watch this video for example, it pretty much sums up everything mentioned above.

Answer 3

Do code like this

Save Swift Array
var firstArr : Array<Dictionary<String, Any>> = response!["history"]! as! Array<Dictionary<String, Any>>

Access valus
let strMessage : String  = fistArr[index]["message"] as! String

Will works..!