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Light weight Promise (Future) framework in iOS.
.package(url: "https://github.com/chronicqazxc/WHPromise.git", from: "0.0.2")


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Light weight Promise (Future) framework in iOS.

How to use.

  1. Client initiate a promise instance.
  2. Subscribe then and reject events.
  3. Receive event.

Case 1. JSON Parser promise

    func jsonParser<Type: Codable>(data: Data) -> Promise<Type> {
        let promise = Promise<Type> { (fulfill, reject) in
            do {
                let decoder = JSONDecoder()
                let products = try decoder.decode(Type.self, from: data)
            } catch {
        return promise

Case 2. Get product type from order id

    func getProductFromOrder(orderId: String) -> Promise<GroceryProduct> {
        let promise = Promise<GroceryProduct> { (fulfill, reject) in
            DispatchQueue.global().async {
                let string = """
                    {"name": "Banana",
                       "points": 200,
                       "description": "A banana grown in Ecuador."
                let jsonData = string.data(using: .utf8)
                let jsonPromise = self.jsonParser(data: jsonData!) as Promise<GroceryProduct>
                jsonPromise.then { product in
                }.catch { error in
        return promise

Case 3. Get product from orderId

func testGetProduct() {
        let ex = expectation(description: "")
        let product = getProductFromOrder(orderId: "12345")
        product.then { product in
            XCTAssertEqual(product.name, "Banana")
            XCTAssertEqual(product.orderId, "12345")
        }.catch { error in
            XCTAssertFalse(false, error.localizedDescription)

        wait(for: [ex], timeout: 10)

Architecture diagram.


Sequence diagram.



Wayne Hsiao


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Last commit: 4 weeks ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

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