[iOS] URLSession

DataTask

（1.) Closure

let url = URL(string: "http://opendata2.epa.gov.tw/UV/UV.json")
if let url = url {
    let request = URLRequest(url: url)
    let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
        //Do something...
    }
    task.resume()
}

（2.) Delegate

//session
 URLSession(configuration: sessionConfiguration, delegate: self, delegateQueue: nil)
 
//create Task
 let task = session?.dataTask(with: request as URLRequest)

//delegate
extension FCNetworkManager: URLSessionTaskDelegate {
    // DataTask 完成時
    public func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
       //Do something...
    }
}

extension FCNetworkManager: URLSessionDataDelegate {
    //appendData
    public func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
        //appendData
        // receivedData!.append(data as Data)
    }
}

DownloadTask

（1.) Closure

let url = URL(string: "http://opendata2.epa.gov.tw/UV/UV.json")
if let url = url {
    let request = URLRequest(url: url)
    let task = URLSession.shared.downloadTask(with: request) { (locationUrl, response, error) in
         //Do Something...
    }
    task.resume()
}

（2.) Delegate

//session
 URLSession(configuration: sessionConfiguration, delegate: self, delegateQueue: nil)
 
//create Task
 let task = session?.downloadTask(with: request as URLRequest)

//delegate
extension FCNetworkManager: URLSessionTaskDelegate {
    // DownloadTask 完成時
    public func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
       //Do something...
    }
}

extension FCNetworkManager: URLSessionDownloadDelegate {
    //download完成的location, 在URLSessionTaskDelegate之前被呼叫
    public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        //Do something...
    }
    
    //download progress
    public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
       //Do something...
    }
}

UploadTask

（1.) Closure

let url = URL(string: "http://xxx.com/upload.php")
var request = URLRequest(url: url!, cachePolicy: .reloadIgnoringCacheData)
request.httpMethod = "POST"
        
let filePath =  NSHomeDirectory() + "/Documents/image.png"
let imgData = try! Data(contentsOf: URL(fileURLWithPath: filePath))
        
_ = URLSession.shared.uploadTask(with: request, from: imgData) {
    (data:Data?, response:URLResponse?, error:Error?) -> Void in  
    //Do something... 
}

(2.) Delegate