Swift 中使用 Alamofire 的多个异步请求完成处理程序

Question

I'm building my app with Swift and I'm using Alamofire for my web requests. I need to perform 4 requests at the same time and then run a function only when information is downloaded. How can I do that? Thank you!

Answer 1

You can use dispatch_group_async and dispatch_group_notify . Create group of requests with dispatch_group_async and dispatch_group_notify will notify you once all the requests are complete.

Answer 2

An easy way to do this would be to have a variable you would lock (or not if it's an atomic variable) you would increment after each request is executed. If it reaches 4 once you increment it, execute your function.