swiftExamples

Some personel solutions to general problems. This solutions may not the best. They only include personel offers to solve some problems.

Detecting Service Error

Problem: While developing apps you connect endpoints almost everytime.So, you must check if any error like connection problems or non-authorized state, missing or wrong data structure etc. And checking these error types in every endpoint connection is really long, ugly and hard-to-maintenance.

Offer: Create a single class and only function to catch and display errors.

Error Detector Class Example :

public class BaseClass{
  func checkErrorCode(response : Alamofire.DataResponse<Any>, viewController : UIViewController? ) -> Bool {
        let errCode = (response.result.value as! NSDictionary).object(forKey: "ErrorCode") as? String
        if errCode != nil {
            let errMessage = (response.result.value as! NSDictionary).object(forKey: "ErrorMessage") as! String
            let alert = UIAlertController(title: "Error", message: errMessage, preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
            if viewController != nil {
                viewController?.present(alert, animated: true, completion: nil)
            }
            return true;
        }
        return false;
    }
}

This is how to use it with Alomofire;

if ErrorCode is not nil this will return true and show an alert that shows ErrorMessage

let error = BaseClass().checkErrorCode(response: response, viewController: self)

if ErrorCode is not nil this will return true and but won't show an alert that shows ErrorMessage

let error = BaseClass().checkErrorCode(response: response, viewController: nil)

You can use return to avoid running code below.

let error = BaseClass().checkErrorCode(response: response, viewController: self)
if error { return; }