Escaping closure captures non-escaping parameter 'function' Xcode says - ios

Question

I'm trying to perform a segue after two API requests are complete, and I have all the data I need. I'm trying do this because the requests take a bit long. However, when I tried to do something like this post, I got these errors:
1. Passing a non-escaping function parameter 'anotherFunc' to a call to a non-escaping function parameter can allow re-entrant modification of a variable
2. Escaping closure captures non-escaping parameter 'anotherFunc'
3. Escaping closure captures non-escaping parameter 'function'
I added comments where the errors show up. Here's my code:
func getUsernameRequest(function: () -> Void) {
// send an API request to get the userinfo
let url = "\(K.API.baseAPIEndpoint)/user"
let headers: HTTPHeaders = [...]
AF.request(url, headers: headers).responseDecodable(of: UserModel.self) { response in // this is where the #3 error shows up
if let value = response.value {
self.username = value.username
// and do other things
function()
} else {
offlineBanner()
}
}
}
func getMessagesRequest(function: (()->Void)->Void, anotherFunc:()->Void) {
let postDetailUrl = "\(K.API.baseAPIEndpoint)/posts/\(postArray[indexPath.row].id)"
let headers: HTTPHeaders = [...]
// send an API request to get all the associated messages
AF.request(postDetailUrl, headers: headers).responseDecodable(of: PostDetailModel.self) { response in // this is the #2 error shows up
if let value = response.value {
self.messages = value.messages
function(anotherFunc) // this is where the #1 error shows up
} else {
offlineBanner()
}
}
}
func performSegueToChat() -> Void {
self.performSegue(withIdentifier: K.Segue.GotoChat, sender: self)
}
getMessagesRequest(function: getUsernameRequest, anotherFunc: performSegueToChat)
Thank you in advance.

Answer 1

I did this the following code, and it works as I expected! (But they aren't too clean)
func getUsernameRequest(function: #escaping() -> Void) {
// send an API request to get the username
let url = "\(K.API.baseAPIEndpoint)/user"
AF.request(url, headers: headers).responseDecodable(of: GetUsernameModel.self) { response in
if let value = response.value {
self.username = value.username
function()
} else {
offlineBanner()
}
}
}
func getMessagesRequest(function: #escaping(#escaping()->Void)->Void, anotherFunc: #escaping()->Void) {
let postDetailUrl = "\(K.API.baseAPIEndpoint)/posts/\(postArray[indexPath.row].id)"
// send an API request to get all the associated messages and put them into messages array
AF.request(postDetailUrl, headers: headers).responseDecodable(of: PostDetailModel.self) { response in
if let value = response.value {
self.messages = value.messages
function(anotherFunc)
} else {
offlineBanner()
}
}
}
func performSegueToChat() -> Void {
self.performSegue(withIdentifier: K.Segue.GotoChat, sender: self)
}
getMessagesRequest(function: getUsernameRequest, anotherFunc: performSegueToChat)