The timer in Recorder doesn't start first time

[guangmingzizai]

The callback of AVAudioSession.requestRecordPermission may not be called on main thread, so the timer in start method may doesn't start, due to absence of runloop.

The solution:

AVAudioSession.sharedInstance().requestRecordPermission() { allowed in
	DispatchQueue.main.async {
		if allowed {
			self.start(url)
		} else {
			self.update(nil)
		}
	}
}

[forbidden404]

I've noticed this too while checking the applications while reading the book.