ios - setSampleBufferDelegate 上的 Swift 代码错误

Question

我在第二行遇到错误，我根本无法解决它。

videoDataOutputQueue = dispatch_queue_create("VideoDataOutputQueue", DISPATCH_QUEUE_SERIAL)
videoDataOutput.setSampleBufferDelegate(self, queue: videoDataOutputQueue)

Error: cannot invoke 'setSampleBufferDelegate' with an argument list of type '(ViewController, queue: dispatch_queue_t)'

Answer 1

setSampleBufferDelegate 的签名是

func setSampleBufferDelegate(_ sampleBufferDelegate: AVCaptureVideoDataOutputSampleBufferDelegate!, queue sampleBufferCallbackQueue: dispatch_queue_t!)

特别是第一个参数需要是 AVCaptureVideoDataOutputSampleBufferDelegate .您的类 ViewController 显然不是这样的委托(delegate)。你可以通过让你的类符合它来解决这个问题:

class ViewController : YourPreviousInheritances, AVCaptureVideoDataOutputSampleBufferDelegate { 
    ...
}