ios - For Loop - Alamofire 以同步方式请求 Swift4 - 执行循环等待异步请求返回

Question

for i in 0 ..< 5 {
                print("Request Number" ,i)
                Alamofire.request("https://httpbin.org/get", parameters: ["foo": "bar"]).responseJSON { response in
                    print("Finished request \(i)")
                }
            }

在这个代码示例中，有什么方法可以让上面的代码以打印的方式运行

Request Number 0
Finished request 0
Request Number 1
Finished request 1
Request Number 2
Finished request 2
Request Number 3
Finished request 3
Request Number 4
Finished request 4

Answer 1

试试这段代码

for i in 0 ..< 5 {
            print("Request Number" ,i)
            let runLoop = CFRunLoopGetCurrent()
            Alamofire.request("https://httpbin.org/get", parameters: ["foo": "bar"]).responseJSON { response in
                print("Finished request \(i)")
                CFRunLoopStop(runLoop)
            }
            CFRunLoopRun()
        }