PromiseKit with paging in swift

Question

I am using https://github.com/mxcl/PromiseKit for setting up the promosekit for chaining the API calls.

I have query regarding the how to implement paging in promisekit.

Answer 1

Instead of using PromiseKit, use OperationQueue. Instead of magic you will understand every bit of it.

Obviously it will took more code than PromiseKit but It's provided built in Apple SDK.

Please check the following snippet

// setup your operation queue
// typically done where you start sending the api request
// like viewDidLoad
// assumed that opQueue is declared as class's instance member
opQueue = OperationQueue.init()
opQueue.maxConcurrentOperationCount = 1 // ensure that only one operation will run at a time
opQueue.name = "Api Call Serializer"
opQueue.qualityOfService = QualityOfService.background

// after instantiating add a operation to the queue
opQueue.addOperation {
    makeApiCall(url: first_url)
}


func makeApiCall(url: URL) {
    //put your api call code here
    YOUR_API_CALL({(responseData)// i have assumed that your api call will ending in a swift closure. If you use delegate, it will be same as following.
        // your processing of api response
        // build the next_url for pagination.
        opQueue.addOperation {
            makeApiCall(url: next_url)
        }            
    })
}

Hope it helps.