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here is my alamofire manager, how I can add public key pinning on it ? please help me, I couldn't know the way to do it in my code, if possible I need explanation step by step on how do that with AFManager that has all the requests

class AFManager : NSObject


///without headers (post)
//used this to registration
class func requestPOSTURL(_ strURL : String, params : [String : 
AnyObject]?, success:@escaping (JSON) -> Void, failure:@escaping (Error) -> Void)
URLCache.shared.removeAllCachedResponses()
Alamofire.request(strURL, method: .post, parameters: params, encoding: URLEncoding.httpBody).responseJSON (responseObject) -> Void in

 //print(responseObject)

 if responseObject.result.isSuccess 
 let resJson = JSON(responseObject.result.value!)
 success(resJson)
 
 if responseObject.result.isFailure 
 let error : Error = responseObject.result.error!
 failure(error)
 




///// response string (post)
//used this in login // used in change password
class func strRequestPOSTURL(_ strURL : String, params : [String : String]?, headers : [String : String]?, success:@escaping (JSON) -> Void, failure:@escaping (Error) -> Void)
URLCache.shared.removeAllCachedResponses()
Alamofire.request(strURL, method: .post, parameters: params, encoding: URLEncoding.httpBody, headers: headers).responseJSON (response) in
 //print(response)

 if response.result.isSuccess 
 let resJson = JSON(response.result.value!)
 success(resJson)
 
 if response.result.isFailure 
 let error : Error = response.result.error!

 failure(error)
 



 

I saw this sample but didn't know how to do it and where I should put the code see the link below :
https://infinum.co/the-capsized-eight/ssl-pinning-revisited

I would recommend using TrustKit. It is a dedicated library that works with everything base on NSURLSession, including Alamofire. Depending on your use case it may be as simple as adding a few values to Info.plist.

Certificate pinning, same as any security measure, is not something you should implement yourself, but you should use a proven library.