Hello everyone I want to crate a base api service for my apps but when I try a lot of different way but i can't solve my problems. I have to use alamofire, promiseKit and generic's.
My first solution and his issue: I can get my json from api but when I try to decode my json every time it fails. There is the code:
func fetchData<T: Codable>(_ page: Int) -> Promise<T> {
let path = getPath(page)
return Promise<T> { seal in
AF.request(path, method: .get).validate(statusCode: 200..<300).responseString { response in
switch response.result {
case .success(let data):
if let json = data.data(using: .utf8) {
do {
let res = try JSONDecoder().decode(T.self, from: json)
print(res)
seal.fulfill(res)
} catch {
print("json serilaztion error")
print(error)
seal.reject(error)
}
}
case .failure(let error):
seal.reject(error)
}
}
}
}
My second solution and issue : When I do my request I get my json response and decode it but in this solution I can't return data with seal.fulfill(data) gives me "Cannot convert value of type 'Any' to expected argument type 'T'" and when I try to seal.fulfill(data as! T) like this when I run app always crashes. There is my code :
func fetchData<T: Codable>(_ page: Int) -> Promise<T> {
let path = getPath(page)
return Promise<T> { seal in
AF.request(path, method: .get).validate(statusCode: 200..<300).responseJSON { response in
switch response.result {
case .success(let data):
seal.fulfill(data as! T) // Cannot convert value of type 'Any' to expected argument type 'T'
case .failure(let error):
seal.reject(error)
}
}
}
}
Finally I'm using test api https://www.flickr.com/services/api/explore/flickr.photos.getRecent to test my code. How I can solved this issue's ? Thanks for your helps
Use responseDecodable instead of responseString or responseJSON.
AF.request(...).responseDecodable(of: T.self) { response in
...
}