我有一个NetworkRequest类,我的所有alamofire请求都在这里：
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()
}
}
}
我需要取消以前的downloadData请求,当新的请求启动时,尝试使用currentRequest？.cancel()取消,但它没有帮助.
已经尝试使用NSOperationsBlock取消操作,但它不会取消当前操作.
我现在阻止UI,因此用户无法发送另一个请求.但这不正确,以后会导致一些错误……
请帮助
现在在Alamofire 4上Alamofire.Manager.sharedInstance.session不可用你应该使用
this解决方案：
let sessionManager = Alamofire.SessionManager.default
sessionManager.session.getTasksWithCompletionHandler { dataTasks,uploadTasks,downloadTasks in
dataTasks.forEach { $0.cancel() }
uploadTasks.forEach { $0.cancel() }
downloadTasks.forEach { $0.cancel() }
}
如果您想取消(暂停,恢复)特定请求,您可以检查.forEach块中的请求URL,如下所示：
dataTasks.forEach {
if ($0.originalRequest?.url?.absoluteString == url) {
$0.cancel()
}
}