我从一个链接导入JSON,其中每个文件都包含一个“next”属性,其中包含下一个JSON文件的URL,直到它最终为null并且已遍历所有文件。
我的问题是,我怎样才能最好地导入所有这些连续文件?因为它们在表中都是必需的,但根据API限制,每个JSON限制为20个对象。
我认为答案是循环查看结果并说明“如果对象的数量是20,那么将URL页面数量增加1”?然后,一旦我点击最后一页并有8个结果,它将知道不再进行另一个循环?我只是无法理解它在代码中的作用以及它所处的位置。
当前请求:
open class ApiService: NSObject {
open func getData(completionHandler: @escaping (NSDictionary?, NSError?) -> Void) -> Self {
let requestUrl = "https://wger.de/api/v2/exercise/?format=json&language=2&status=2&?limit=199"
Alamofire.request(requestUrl, method: .get, encoding: URLEncoding.default)
.responseJSON { response in
switch response.result {
case .success( let data):
print("Request was sucessful")
completionHandler(data as? NSDictionary, nil)
case .failure(let error):
print("Request failed with error: \(error)")
completionHandler(nil, error as NSError?)
}
}
return self
}
编辑更新:如果要在评论中应用代码,这是我当前的代码,但我仍有问题:
let requestUrl = "https://wger.de/api/v2/exercise/?format=json&language=2&status=2"
open func getData(_URL: NSURL, completionHandler: @escaping (NSDictionary?, NSError?) -> Void) -> Self {
Alamofire.request(requestUrl, method: .get, encoding: URLEncoding.default)
.responseJSON { response in
switch response.result {
case .success(let data):
print("Request was sucessful")
let json = data as! [String:Any]
let results = json["results"] as! NSDictionary; completionHandler(results, nil)
if let nextURL = json["next"] as? NSURL {self.getData(_URL: nextURL, completionHandler: completionHandler)} else { print(json["next"] as? String)
print("No next page, we are at the end")
}
case .failure(let error):
print("Request failed with error: \(error)")
completionHandler(nil, error as NSError?)
}
}
return self
答案 0 :(得分:1)
更新您的代码(我尚未编译)
open class ApiService: NSObject {
open func getData(requestUrl: String, completionHandler: @escaping (NSDictionary?, NSError?) -> Void) -> Self {
Alamofire.request(requestUrl, method: .get, encoding: URLEncoding.default)
.responseJSON { response in
switch response.result {
case .success(let data):
print("Request was sucessful")
completionHandler(data as? NSDictionary, nil)
case .failure(let error):
print("Request failed with error: \(error)")
completionHandler(nil, error as NSError?)
}
}
return self
}
}
View Controller中的代码
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let initialURLString = "https://wger.de/api/v2/exercise/?format=json&language=2&status=2"
getApiData(dataURL:initialURLString)
}
func getApiData(dataURL: String) {
let _ = apiService.getData(requestUrl: dataURL) {
(data, error) in
if let data = data {
if let results = data["results"] as? [[String:Any]] {
for result in results {
if let exercise = Exercise(dictionary: result) {
self.exercises.append(exercise)
}
}
self.exercisesTableView.reloadData()
}
if let nextURL = data["next"] as? String
{
print("NEXT URL: \(nextURL)")
self.getApiData(dataURL:nextURL)
}
}
}
}