Swift 2 AVAudioSession setCategory额外参数'错误' [英] Swift 2 AVAudioSession setCategory extra argument 'error'

问题描述

设置录制音频时，出现错误.

When I set up to record audio, I get an error.

if (session.respondsToSelector("requestRecordPermission:")) {
    AVAudioSession.sharedInstance().requestRecordPermission({(granted: Bool)-> Void in
        if granted {
            print("granted")
            session.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)
            session.setActive(true, error: nil)
            self.recorder ()
        } else{
            print("not granted")
        }
   })
}

为什么我有error: nil会收到错误消息?

Why do I get an error for having error: nil?

推荐答案

像这样:

try! session.setCategory(AVAudioSessionCategoryPlayAndRecord)

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