我正在编写一个库,所以不使用 UIKit,即使在我的 iOS 应用程序中也可以使用相同的代码,但是当我在命令行中执行时却没有。在 PlayGround 中,它似乎也有效。
由于某种原因回调没有被触发,所以打印语句没有执行。
internal class func post(request: URLRequest, responseCallback: @escaping (Bool, AnyObject?) -> ()) {
execTask(request: request, taskCallback: { (status, resp) -> Void in
responseCallback(status, resp)
})
}
internal class func clientURLRequest(url: URL, path: String, method: RequestMethod.RawValue, params: Dictionary<String, Any>? = nil) -> URLRequest {
var request = URLRequest(url: url)
request.httpMethod = method
do {
let jsonData = try JSONSerialization.data(withJSONObject: (params! as [String : Any]), options: .prettyPrinted)
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.httpBody = jsonData
} catch let error as NSError {
print(error)
}
return request
}
private class func execTask(request: URLRequest, taskCallback: @escaping (Bool,
AnyObject?) -> ()) {
let session = URLSession(configuration: URLSessionConfiguration.default)
print("THIS LINE IS PRINTED")
let task = session.dataTask(with: request, completionHandler: {(data, response, error) -> Void in
if let data = data {
print("THIS ONE IS NOT PRINTED")
let json = try? JSONSerialization.jsonObject(with: data, options: [])
if let response = response as? HTTPURLResponse , 200...299 ~= response.statusCode {
taskCallback(true, json as AnyObject?)
} else {
taskCallback(false, json as AnyObject?)
}
}
})
task.resume()
}
编辑 -:我正在编写一个库,所以不使用 UIKit,即使在我的 iOS 应用程序中也可以使用相同的代码,但是当我在命令行中执行时却没有。在 PlayGround 中,它似乎也有效。
最佳答案
我从头开始做了一个简单的应用程序。 (Xcode 8 beta 6/swift 3)
在 Controller 中,我粘贴了您的代码。 (加上网址创建..)
我在调试器中看到所有:
这个是打印的
这个也是打印的
我回来了
所以它似乎工作。
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let URLString = "https://apple.com"
let url = URL(string: URLString)
let request = URLRequest(url: url!)
ViewController.execTask(request: request) { (ok, obj) in
print("I AM BACK")
}
}
private class func execTask(request: URLRequest, taskCallback: @escaping (Bool,
AnyObject?) -> ()) {
let session = URLSession(configuration: URLSessionConfiguration.default)
print("THIS LINE IS PRINTED")
let task = session.dataTask(with: request, completionHandler: {(data, response, error) -> Void in
if let data = data {
print("THIS ONE IS PRINTED, TOO")
let json = try? JSONSerialization.jsonObject(with: data, options: [])
if let response = response as? HTTPURLResponse , 200...299 ~= response.statusCode {
taskCallback(true, json as AnyObject?)
} else {
taskCallback(false, json as AnyObject?)
}
}
})
task.resume()
}
}
关于nsurlsession - Swift 3,未调用 URLSession dataTask completionHandler,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39053593/