调用 GraphQL appSync 请求并等待结果返回 Swift iOS

Question

我希望我的应用程序等到请求结果返回。所以在下面的块中，我想做的是，如果请求的查询 return 的结果为空，我想调用“self.insertCreditRecord”。有没有人这样做过？ appSyncClient?.fetch(query: selectQuery, cachePolicy: .fetchIgnoringCacheData) {(result, error) 在如果错误！=无{ 打印（错误？.localizedDescription ??“”） return }

            result?.data?.listTranscriberConfigs?.items!.forEach {

                if let credit = Double([=12=]?.value ?? "0.0")
                {
                    UserCredit.id = ""
                    UserCredit.id = [=12=]?.id ?? ""
                    UserCredit.email = [=12=]?.param ?? ""
                    UserCredit.credit =  credit
                }

                if UserCredit.id == "" {
                    self.insertCreditRecord(email: email)
                }
                print(([=12=]?.param)! + " " + ([=12=]?.value)!)
 
            }
        
        
        
    }

Answer 1

您只需要在函数中使用完成处理程序来忽略 null return

例如

typealias CompletionHandler = (success:Bool) -> Void

func downloadFileFromURL(url: NSURL,completionHandler: CompletionHandler) {

    // download code.

    let flag = true // true if download succeed,false otherwise

    completionHandler(success: flag)
}

// How to use it.

downloadFileFromURL(NSURL(string: "url_str")!, { (success) -> Void in

    // When download completes,control flow goes here.
    if success {
        // download success
    } else {
        // download fail
    }
})

调用 GraphQL appSync 请求并等待结果返回 Swift iOS

Calling GraphQL appSync requests and wait for the result to come back Swift iOS

ios

swift

aws-appsync