在取消初始化之前发出信号量信号安全吗？以防万一？ class SomeViewController: UIViewController { let semaphore = DispatchSemaphore(value: 1) deinit { semaphore.signal() // just in case? } func someLongAsyncTask() { sem .. 发布时间：2022-04-15 17:06:43 swift grand-central-dispatch dispatchsemaphore 移动开发
