DispatchGroup:检查“进入"了多少 [英] DispatchGroup: check how many "entered"

问题描述

我正在使用 Swift 3 DispatchGroup 等待多个异步操作完成(根据 this answer 工作完美，符合预期.

I'm using Swift 3 DispatchGroup to wait until multiple async operations are finished (according to this answer which works perfect and as expected.

有没有办法检查已经输入了多少操作，比如 dispatchGroup.count 或类似的东西?

Is there a way to check how many operations are entered already, like dispatchGroup.count or something like that?

推荐答案

你可以在调试说明中看到进入组的次数:

You can see counts of enters to the group in debug description:

OS_dispatch_group: group[0x60000221d950] = { xref = 3, ref = 3,count = 2，gen = 0，waiters = 0，notifs = 1 }

OS_dispatch_group: group[0x60000221d950] = { xref = 3, ref = 3, count = 2, gen = 0, waiters = 0, notifs = 1 }

并从中提取 int 值:

and extract int value out of it:

let count = dispatchGroup.debugDescription.components(separatedBy: ",").filter({$0.contains("count")}).first?.components(separatedBy: CharacterSet.decimalDigits.inverted).compactMap{Int($0)}.first

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