我有一个NetworkRequest类,其中包含所有我的Alamofire请求:
class NetworkRequest {
static let request = NetworkRequest()
var currentRequest: Alamofire.Request?
let dataManager = DataManager()
let networkManager = NetworkReachabilityManager()
let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
func downloadData<T: Film>(slug: String, provider: String, section: String, dynamic: String, anyClass: T, completion: ([T]?) -> Void ) {
var token: String = ""
if LOGGED_IN == true {
token = "\(NSUserDefaults.standardUserDefaults().valueForKey(TOKEN)!)"
}
let headers = [
"Access": "application/json",
"Authorization": "Bearer \(token)"
]
let dataUrl = "\(BASE_URL)\(slug)\(provider)\(section)\(dynamic)"
print(headers)
print(dataUrl)
if networkManager!.isReachable {
currentRequest?.cancel()
dispatch_async(dispatch_get_global_queue(priority, 0)) {
if let url = NSURL(string: dataUrl) {
let request = Alamofire.request(.GET, url, headers: headers)
request.validate().responseJSON { response in
switch response.result {
case .Success:
if let data = response.result.value as! [String: AnyObject]! {
let receivedData = self.dataManager.parseDataToFilms(data, someClass: anyClass)
completion(receivedData)
}
case .Failure(let error):
print("Alamofire error: \(error)")
if error.code == 1001 {
self.goToNoConnectionVC()
}
print("canceled")
}
}
}
}
} else {
goToNoConnectionVC()
}
}
}
当我需要开始一个新的downloadData请求时,我需要取消之前的请求。我试着使用currentRequest?.cancel()来取消请求,但它没有起作用。我已经使用了NSOperationsBlock来尝试取消操作,但它不能取消当前的操作。现在我阻塞了用户界面,以防止用户发送另一个请求,但这并不正确,后续会导致一些错误...请帮忙解决。