How to use?

[hamada147]

I just wanna know how to use it as it is extremely confusing to me.
I just want to use it in this kind of way

firslty {
    self.runMethod1()
}.then {
    self.runMethod2()
}.then {
    self.runMethod3()
}.then {
    self.runMethod4()
}.catch { error in
    // any errors in the whole chain land here
    print(error)
}

but I keep getting this error

Cannot convert value of type '()' to closure result type 'AnyPromise'
OR
Cannot convert value of type 'Void' to closure result type 'AnyPromise'

I tried doing it this way

firslty {
    self.runMethod1()
    return Promise<Void>()
}.then {
    self.runMethod2()
    return Promise<Void>()
}.then {
    self.runMethod3()
    return Promise<Void>()
}.then {
    self.runMethod4()
    return Promise<Void>()
}.catch { error in
    // any errors in the whole chain land here
    print(error)
}

but the last one always show this error

Cannot convert return expression of type 'Promise<Void>' to return type 'AnyPromise'

I don't need the method to return any value for the next method to run based on it. I just need them to run in that order. What am I doing wrong??

Please Note That:-
Every method is different API call.
And for each API request I'm using Moya

Edit #1:
here is my whole code

func getData(_ target: TTouchAPI_PreAuthenticationService) -> Promise<String> {
        self.RequestName = target.RequestName
        return Promise { fulfill, reject in
            self.Provider.request(target) { result in
                self.RequestCompleted = true
                switch result {
                case let .success(moyaResponse):
                    let statusCode = moyaResponse.statusCode
                    if (statusCode == 200) {
                        self.RequestSuccessed = true
                        self.data = moyaResponse.data
                        self.processData()
                        fulfill("Done")
                    }
                case let .failure(error):
                    reject(error)
                }
            }
            self.RequestSent = true
        }
    }

And I'm calling the same method 3 times in row with different request each time

        firstly {
            let Loc: PreAuthenticationWSService = PreAuthenticationWSService()
            Loc.getData(.getLocalization)
        }.then {
            let Theme: PreAuthenticationWSService = PreAuthenticationWSService()
            Theme.getData(.getThemes)
        }.then {
            let LoginInfo: PreAuthenticationWSService = PreAuthenticationWSService()
            LoginInfo.getData(.getLoginSetupInformation)
        }.catch { error in
            print(error)
        }

in each

then

I get the following error

Missing return in a closure expected to return 'Promise<()>'

[hamada147]

I found your detailed documentations

[mxcl]

That is the old documentation,. please use: https://github.com/mxcl/PromiseKit/tree/master/Documentation

In addition we provide a Troubleshooting guide that exactly tells you how to deal with your error. This guide is linked from the README, always start at the README.

[doruchidean-lifeishard]

@mxcl The links are broken now

[mxcl]

The README provides these links, but I spent 4 seconds grabbing them for you from there.

• https://github.com/mxcl/PromiseKit/tree/master/Documents
• https://github.com/mxcl/PromiseKit/blob/master/Documents/Troubleshooting.md