ios - 断断续续的快门声

Question

我正在使用以下代码在我的 iOS 应用程序中拍照:

self.stillImageOutput.captureStillImageAsynchronously(from: videoConnection) {
    // Do some stuff here
    self.captureSession.stopRunning()
    // Do some more stuff
}

出于某种原因，在捕获 block 中调用 stopRunning() 会使快门声音断断续续。如果我将其移除，则快门声音非常好。我怎样才能防止这种情况发生？

Answer 1

您不想异步访问 UI。根据您的描述，听起来异步 block 可能是口吃的来源。为了让主队列播放您的声音，您可以尝试两种方法:

// everything is going swimmingly until you play the sound...
// grab the main queue
DispatchQueue.main.async {
// play your sound
}
// and live happily ever after

另一种方法:

// everything is going swimmingly until you play the sound...
// grab the main queue
DispatchQueue.main.suspend()
// play your sound                
DispatchQueue.main.resume()
// and live happily ever after