CODEWITHSUNDEEP
iosswiftdelegates
Sharad Chauhan
Sharad Chauhan

Reputation: 4891

Class with custom delegate

I am creating a custom delegate in a class and trying to implement the protocol in my controller. But is not working as delegate is nil. This is how I am doing it :

BluetoothOperations.swit

protocol GetWatchCollectedData:NSObjectProtocol {
    func getWatchCollectedData(COMMAND_ID : UInt8, data : NSData)
}

class BluetoothOperations: NSObject{
    var getWatchCollectedData: GetWatchCollectedData?

    func customFunc(){
        getWatchCollectedData.getWatchCollectedData(ID,Data)
    }
}

SomeController.swift

class SomeController: UIViewController {
   let object = BluetoothOperations()

   override func viewDidLoad() {
        super.viewDidLoad()
        object.getWatchCollectedData = self

    }
}

extension SomeController: GetWatchCollectedData{
    func getWatchCollectedData(COMMAND_ID : UInt8, data : NSData){
        print("delegate working.")
    } 
}

I have also tried to make an object of class and assign BluetoothOperations's object. getWatchCollectedData = self in viewDidLoad but didn't work.

Any idea where I am doing it wrong ? Thanks.

Upvotes: 3

Views: 456

Answers (2)

Prashant Tukadiya
Prashant Tukadiya

Reputation: 16436

You have correctly implemented delegate but not between proper classes

As you have created object of BluetoothOperations in SomeController and also in other View controller let's say SomeController1

Now The delegate is responsible for only relevant class only

like

`BluetoothOperations` (Call `customFunc`)     ---->  `SomeController1`
`BluetoothOperations`  (Call `customFunc`)    ---->  `SomeController`

And you are trying like this

 `SomeController1  ---> `BluetoothOperations` (Call `customFunc`)  ----> SomeController`

This couldn't be achieved by this way,

As your SomeController1 and SomeController are not in connection from anywhere

It is very difficult to suggest you a answer

you create delegate between SomeController1 and SomeController both of them.

Hope it is clear to you

Upvotes: 1

Fangming
Fangming

Reputation: 25261

Your code looks correct. And here is the a possible reason why it may fail. In your SomeController, you are creating object from your BluetoothOperations class and assigned delegate correctly.

HOWEVER, you must make sure that the object defined in your controller is sending out the delegate call. You could be having another instance of the BluetoothOperations and that is actually being used, AND IN THAT INSTANCE, the delegate is not set.

The easiest way to check this is to manually trigger the delegate in the object you created in your view controller. Try the following code to see if the delegate get triggered or not.

class SomeController: UIViewController {
   let object = BluetoothOperations()

   override func viewDidLoad() {
        super.viewDidLoad()
        object.getWatchCollectedData = self
        object.customFunc()// Trigger the delegate function here
    }
}

extension SomeController: GetWatchCollectedData{
    func getWatchCollectedData(COMMAND_ID : UInt8, data : NSData){
        print("delegate working.")
    } 
}

Upvotes: 2

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