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[英]IOS Swift Nested DispatchGroup for Nested Network requests handling arrays
[英]Nested DispatchGroup
我尝试使用嵌套的DispatchGroup,这是我的代码:
class TranslateService {
private let myGroup = DispatchGroup()
func translateText(text:[String],closure:@escaping ((_ success:String?,_ error:Error?) -> Void)) {
var translateString: String = ""
var responseError: Error?
for index in 0...text.count - 1 {
let urlString = "https://translate.yandex.net/api/v1.5/tr.json/translate?key=trnsl.1.1.20171105T134956Z.795c7a0141d3061b.dc25bae76fa5740b2cdecb02396644dea58edd24&text=\(text[index])&lang=fa&format=plain&options=1"
if let allowString = Utilities.shareInstance.getQueryAllowedString(url: urlString) {
if let url = URL(string:allowString){
myGroup.enter()
Alamofire.request(url).responseJSON { response in
guard let responseData = response.data else {
self.myGroup.leave()
return
}
do {
let json = try JSONSerialization.jsonObject(with: responseData, options: [])
if let res = json as? [String:Any] {
if let code = res["code"] as? Int {
if code == 200 {
if let textArr = res["text"] as? [AnyObject] {
let flattArr = Utilities.shareInstance.flatStringMapArray(textArr)
if flattArr.count > 0 {
translateString += "،" + flattArr[0]
}
}
}
}
self.myGroup.leave()
}
}catch {
responseError = error
self.myGroup.leave()
}
}
self.myGroup.notify(queue: .main) {
print("Finished all requests.")
print(translateString)
closure(translateString, responseError)
}
}
}
}
}
}
class AddressService {
private let translateService: TranslateService = TranslateService()
private let myGroup = DispatchGroup()
func fetchAddressFromGeographicalLocation(latitude: Double, longitude: Double,closure:@escaping ((_ success:String,_ name:String,_ error:Error?) -> Void)) {
var address: String = ""
let name: String = ""
var responseError: Error?
if let url = URL(string:"https://maps.googleapis.com/maps/api/geocode/json?latlng=\(latitude),\(longitude)&key=AIzaSyAdEzHZfZWyjLMuuW92w5fkR86S3-opIF0&language=fa®ion=IR&locale=fa"){
self.myGroup.enter()
Alamofire.request(url).responseJSON { response in
guard let responseData = response.data else {
self.myGroup.leave()
return
}
do {
let json = try JSONSerialization.jsonObject(with: responseData, options: [])
if let addressDic = json as? [String:Any] {
if let result = addressDic["results"] as? [AnyObject] {
if result.count > 0 {
let flattRes = Utilities.shareInstance.flatMapArray(result)
let item = flattRes[0]
address = item["formatted_address"] as? String ?? ""
var res = address
if res.isContainEnglishCharachter {
self.myGroup.enter()
let resArr = res.components(separatedBy: ",")
var all : [String] = []
for item in resArr {
if item != " " {
all.append(item)
}}
self.translateService.translateText(text: all, closure: {stringAdd,error in
self.myGroup.enter()
if error != nil {
self.myGroup.leave()
}else {
address = stringAdd ?? ""
self.myGroup.leave()
} })
}else {
self.myGroup.leave()
}
}
}
}
}catch {
responseError = error
self.myGroup.leave()
}
self.myGroup.notify(queue: .main) {
// print("Finished all requests.")
closure(address, name, responseError)
}
}
}
}
}
我想要的只是我放在AddressService类中的myGroup等待我放在TranslateService类中的myGroup。 但是现在self.myGroup.notify无法在AddressService类中调用,因此关闭无法正常工作。 怎样解决这个问题,谢谢大家的解答。
我认为您过于复杂了。
如果我有所了解,您想要做的是以下操作:
使用地址服务时,仅完成一个呼叫,因此此时无需使用调度组。 调度组用于同步多个异步调用。
对于您的翻译服务,您可以充分利用Dispatch组,因为您正在for循环内对服务进行调用。 这里的问题是,实现有些错误。 您将在for循环内设置通知块,并且该通知块应位于外部,以便在循环内的所有调用完成后仅触发一次。
因此,将此块移到Translation服务的for循环之外:
self.myGroup.notify(queue: .main) {
print("Finished all requests.")
print(translateString)
closure(translateString, responseError)
}
现在,“完成所有请求”。 完成所有请求后,仅打印一次。
在地址服务中,您根本不需要调度组。 只需等待完成块被调用即可。
self.translateService.translateText(text: all, closure: {stringAdd,error in
Everything is done here already.
}
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