How to call Async task in Swift? - ios

Question

I'm new to Swift and hence the question, I'm trying to wrap http calls into a function to reuse, however since it takes a completion block, I'm not sure how to call it. Here's my code,
func httpPost(_ path: String, _ parameters: [String: Any], completion:#escaping(_ ret:Any?,_ err:Error?) -> Void){
let headers = [
"Content-Type": "application/json",
"cache-control": "no-cache"
]
let postData = try? JSONSerialization.data(withJSONObject: parameters, options: [])
var request = URLRequest(url: URL(string: path)! as URL,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData
let session = URLSession.shared
let dataTask = session.dataTask(with: request) { (data, response, error) -> Void in
guard let data = data else {
completion(nil,error)
return
}
do{
try self.validate(response)
let json = try JSONSerialization.jsonObject(with: data, options: [])
completion(json,nil)
}catch{
print(error)
completion(nil,error)
}
}
dataTask.resume()
}
My question is how do I call this function?

Answer 1

I would assume that the Xcode itself would suggest how calling this method should be implemented. If you tried to type "httpPo...", you should see the autocompletion list:
double click on it:
I would assume that the path and parameters are easy to understand, it issue could be related to the completion closure; What you could do is to double click on it, therefore:
And that's pretty much it! All you have to do for now is to fill it:
httpPost("your path", [: ]) { (response, error) in
// ...
}