swift 3.0中的dispatch_group_async函数

Question

我的问题是如何在Swift 3中正确翻译这个函数,因为我注意到有很多文档,dispatch_async但没有任何关于dispatch_group_async

dispatch_group_async(group, dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0)) { [unowned self] in

Answer 1

试试这个:

let group = DispatchGroup()

DispatchQueue.global(qos: .userInitiated)
    .async(group:group) { [unowned self] in
        // code
    }