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AlamofireCodable: An extension to Alamofire which automatically converts JSON response data into swift objects using Codable. This project is heavily inspired by the popular AlamofireObjectMapper.

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Installation

AlamofireCodable can be added to your project using CocoaPods by adding the following line to your Podfile:

pod 'AlamofireCodable'

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

Requirements

Xcode 9+ , Swift 4+

Usage

Given a URL which returns weather data in the following form:

{  
   "data":{  
      "location":"Toronto, Canada",
      "three_day_forecast":[  
         {  
            "conditions":"Partly cloudy",
            "day":"Monday",
            "temperature":20
         },
         {  
            "conditions":"Showers",
            "day":"Tuesday",
            "temperature":22
         },
         {  
            "conditions":"Sunny",
            "day":"Wednesday",
            "temperature":28
         }
      ]
   }
}

You can use the extension as the follows:

import AlamofireCodable

        let form = WeatherForm()
        Alamofire.request(
                form.url,
                method: HTTPMethod.get,
                parameters: form.parameters(),
                encoding: form.encoding(),
                headers: form.headers()
            )
            .responseObject(keyPath: "data",completionHandler: { (response: DataResponse<Weather>) in
                switch response.result {
                case .success(let object):
                    debugPrint("🌹", object.location)
                case .failure(let error):
                    debugPrint("🌹", error.localizedDescription)
                }
            })

The Weather object in the completion handler is a custom object which you define. The only requirement is that the object must conform to Codable protocol. In the above example, the Weather object looks like the following:

{  
   "data":{  
      "location":"Toronto, Canada",
      "three_day_forecast":[  
         {  
            "conditions":"Partly cloudy",
            "day":"Monday",
            "temperature":20
         },
         {  
            "conditions":"Showers",
            "day":"Tuesday",
            "temperature":22
         },
         {  
            "conditions":"Sunny",
            "day":"Wednesday",
            "temperature":28
         }
      ]
   }
}

The extension uses Generics to allow you to create your own custom response objects. Below is the responseObject function definition. Just replace T in the completionHandler with your custom response object and the extension handles the rest:

public func responseObject<T: Codable>(queue: DispatchQueue? = nil, keyPath: String? = nil,  completionHandler: @escaping (DataResponse<T>) -> Void) -> Self 

The responseObject function has 2 optional parameters and a required completionHandler:

Easy decode of Nested Objects

AlamofireCodable supports dot notation within keys for easy mapping of nested objects. Given the following JSON String:

{  
   "data":{  
      "location":"Toronto, Canada",
      "three_day_forecast":[  
         {  
            "conditions":"Partly cloudy",
            "day":"Monday",
            "temperature":20
         },
         {  
            "conditions":"Showers",
            "day":"Tuesday",
            "temperature":22
         },
         {  
            "conditions":"Sunny",
            "day":"Wednesday",
            "temperature":28
         }
      ]
   }
}

You can access the nested objects as follows:

      let form = WeatherForm()
        Alamofire.request(
            form.url,
            method: HTTPMethod.get,
            parameters: form.parameters(),
            encoding: form.encoding(),
            headers: form.headers()
            )
            .responseObject(completionHandler: { (response: DataResponse<RootModel>) in
                switch response.result {
                case .success(let root):
                    debugPrint("🌹", root)
                case .failure(let error):
                    debugPrint("🌹", error.localizedDescription)
                }
            })

KeyPath

The keyPath variable is used to drill down into a JSON response and only map the data found at that keyPath. It supports nested values such as data.three_day_forecast to drill down several levels in a JSON response.

let form = WeatherForm()
        Alamofire.request(
                form.url,
                method: HTTPMethod.get,
                parameters: form.parameters(),
                encoding: form.encoding(),
                headers: form.headers()
            )
            .responseArray(keyPath: "data.three_day_forecast", completionHandler: { (response: DataResponse<[Forecast]>) in
                switch response.result {
                case .success(let array):
                    debugPrint("🌹", array)
                case .failure(let error):
                    debugPrint("🌹", error.localizedDescription)
                }
            })

Array Responses

If you have an endpoint that returns data in Array form you can map it with the following function:

public func responseArray<T: Codable>(queue: DispatchQueue? = nil, keyPath: String? = nil, completionHandler: @escaping (DataResponse<[T]>) -> Void) -> Self 

For example, if your endpoint returns the following:

[
    { 
        "conditions": "Partly cloudy",
        "day" : "Monday",
        "temperature": 20 
    },
    { 
        "conditions": "Showers",
        "day" : "Tuesday",
        "temperature": 22 
    },
    { 
        "conditions": "Sunny",
        "day" : "Wednesday",
        "temperature": 28 
    }
]

You can request and map it as follows:

        let form = WeatherForm()
        Alamofire.request(
                form.url,
                method: HTTPMethod.get,
                parameters: form.parameters(),
                encoding: form.encoding(),
                headers: form.headers()
            )
            .responseArray(keyPath: "data.three_day_forecast", completionHandler: { (response: DataResponse<[Forecast]>) in
                switch response.result {
                case .success(let array):
                    debugPrint("🌹", array)
                case .failure(let error):
                    debugPrint("🌹", error.localizedDescription)
                }
            })

Author

wangchengqvan@gmail.com, chengquan.wang@ele.me

License

AlamofireCodable is available under the MIT license. See the LICENSE file for more info.