我尝试用swift 3创建我的第一个项目。Syncronize异步功能
我尝试从我的API获取数据。如果我手动启动该功能,这很好。我需要同步异步请求。
我需要触发我的功能3次,并等待其他人完成。
makeGetCall(URLstring: "api1")
等待完成
makeGetCall(URLstring: "api2")
等待完成
makeGetCall(URLstring: "api3")
设置此背景并触发每5秒。
func makeGetCall(URLstring: String, update: Bool) {
let completeURL = "http://myapi/" + URLstring
// Set up the URL request
guard let url = URL(string: completeURL) else {
print("Error: cannot create URL")
return
}
let urlRequest = URLRequest(url: url)
// set up the session
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
// make the request
let task = session.dataTask(with: urlRequest) {
(data, response, error) in
// check for any errors
guard error == nil else {
print("error calling GET on /todos/1")
print(error as Any)
return
}
// make sure we got data
guard let responseData = data else {
print("Error: did not receive data")
return
}
// parse the result as XML
if URLstring == "devicelist.cgi" {
self.readDevice(XMLData: responseData)
}
if URLstring == "statelist.cgi" {
self.readDeviceData(XMLData: responseData, update: update)
}
if URLstring == "functionlist.cgi" {
self.readGewerke(XMLData: responseData)
}
}
task.resume()
}
有人可以帮忙。
哈根
这就是我试图完成处理:
override func viewDidLoad() {
super.viewDidLoad()
makeGetCall(input: "statelist.cgi") {
(result: Bool) in
print("finished statelist")
}
makeGetCall(input: "devicelist.cgi") {
(result: Bool) in
print("finished devicelist")
}
makeGetCall(input: "functionlist.cgi") {
(result: Bool) in
print("finished functionlist")
}
}
func makeGetCall(input: String, completion: @escaping (_ result: Bool) -> Void) {
let completeURL = "http://192.168.0.25/addons/xmlapi/" + input
// Set up the URL request
guard let url = URL(string: completeURL) else {
print("Error: cannot create URL")
return
}
let urlRequest = URLRequest(url: url)
// set up the session
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
// make the request
let task = session.dataTask(with: urlRequest) {
(data, response, error) in
// check for any errors
guard error == nil else {
print("error calling GET on /todos/1")
print(error as Any)
return
}
// make sure we got data
guard data != nil else {
print("Error: did not receive data")
return
}
completion(true)
}
task.resume()
}
如果我把3个电话一起它的工作,因为它应该。 我的事情也应该有GCD工作,但大多数的例子为迅速2.
makeGetCall(input: "devicelist.cgi") {
(result: Bool) in
print("finished devicelist")
self.makeGetCall(input: "functionlist.cgi") {
(result: Bool) in
print("finished functionlist")
self.makeGetCall(input: "statelist.cgi") {
(result: Bool) in
print("finished statelist")
}
}
}
也许现在有人可以提供帮助。
Thanks Hagen
向'makeGetCall()'添加完成处理程序并使用'DispatchGroup'来等待或得到通知。 – shallowThought
我试图解决我的问题,但没有得到工作。有人可以给我建议。 – Hagen
显示您使用完成处理程序尝试过的内容 – shallowThought