Combine NSMutableArray with [Swift Array]

Question

The goal: I want to have a computed property which returns an array with different type of objects based on NSMutableArray and swift array combination.

Two problem here:

Computed property contains code with an NSMutableArray
I don't know how to combine two arrays. NSMutableArray + [AnyObjct]

I have an Objective-C class CentralManager with a method storedDevices that returns NSMutableArray with some objects. Example:

var wifiDevices = [WifiDevice]()

var allDevices: NSMutableArray {
  get {
    let blueToothDevices = CentralManager.shared().storedDevices
    let devices = blueToothDevices + wifiDevices // it does not work as we can't combine NSMutableArray and swift array.

    return devices
  }
}

Also as I use swift not sure that my computed property should return NSMutableArray, maybe it's better to return [AnyObject]

Nirav D · Accepted Answer · 2016-08-22 11:33:23Z

1

You can use addObjectsFromArray method of NSMutableArray for that

var allDevices: NSMutableArray {
   get {
       var blueToothDevices = CentralManager.shared().storedDevices
       let devices = blueToothDevices.addObjectsFromArray(wifiDevices) 
       return devices
   }
}

Edit: If you want allDevices to be of swift array and your blueToothDevices contains WifiDevice type of object you can use [WifiDevice] like this way.

var blueToothDevices = CentralManager.shared().storedDevices
var devices = blueToothDevices.objectEnumerator().allObjects as! [WifiDevice]
let devices = devices + wifiDevices

For Any Object

var allDevices: [AnyObject] {
    get {
        var blueToothDevices = CentralManager.shared().storedDevices
        var blueTooths = blueToothDevices.objectEnumerator().allObjects
        blueTooths = blueTooths + wifiDevices
        return blueTooths
    }
}

edited Aug 22, 2016 at 11:33

answered Aug 22, 2016 at 10:53

Nirav D

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4 Comments

Oleksandr Matrosov Over a year ago

thanks for answer! let devices = devices + wifiDevices brings this issue `Binary operator '+' cannot be applied to operands of type '[BluetothDevice]' and '[WifiDevice]'

Oleksandr Matrosov Over a year ago

blueToothDevices.addObjectsFromArray(wifiDevices) return devices throws this complier issue: Cannot convert return expression of type 'Void' (aka '()') to return type 'NSMutableArray'

Nirav D Over a year ago

I have told you it only works if blueToothDevices contains WifiDevice object, for this situation you need to convert both array to [AnyObject] and than concatenate them with + or either use my first answer.

Oleksandr Matrosov Over a year ago

thanks for details, so in my question CentralManager.shared().storedDevices is an NSMutableArray which can contain any object right? In Objective-C that type of array can return to you even NSNumber, but let's assume that I expect BluetoothDevice objects which I want to set to let blueToothDevices and also I have wifiDevices array which contains [WiFiDivice] model as in my question, so the question is regarding how can I combine these two arrays. Can you show in your answer how to do it, thanks! appreciate any help.

Kirit Modi · Accepted Answer · 2016-08-22 10:59:49Z

0

Let's See Simple Example :

NSMutableArray

Take one NSMutableArray with two Object "A" and "B"

 let mutableArray = NSMutableArray()
 mutableArray.addObject("A")
 mutableArray.addObject("B")
 print(mutableArray)

Swift Array :

Take Swift Array with two Object "C" and "D"

 var swiftArray = [String]()
 swiftArray = ["C" , "D"]

concat two Array

let mutableSwift = mutableArray.objectEnumerator().allObjects as? [String]
swiftArray = swiftArray + mutableSwift!

print(swiftArray)

Finally You Swift Array

["C", "D", "A", "B"]

answered Aug 22, 2016 at 10:59

Kirit Modi

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2 Comments

Oleksandr Matrosov Over a year ago

thanks for the answer, but in your case, you have the same types, in my example CentralManager.shared().storedDevices can return what ever NSMutableArray can store, but actually it will be BluetoothDevice model and my other swift array contains WifiDevice model, so I am not sure that I can simpe + this arrays.

Kirit Modi Over a year ago

You can Keep AnyObject. and when you use then Check object is BluetoothDevice or WifiDevice.

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