swift - x 秒后触发 iphone 视频录制

Question

在一个 swift 应用程序中，我想在等待 10 秒后开始用相机录制视频。

一旦 10 秒等待结束，将调用此函数:

func startRecording() {
  // trigger video recording
}

到目前为止，当用户点击“录制视频按钮”时，它会显示相机界面，然后用户必须点击内置的录制按钮:

@IBAction func recordVideo(sender: AnyObject) {
        if (UIImagePickerController.isSourceTypeAvailable(.Camera)) {
            if UIImagePickerController.availableCaptureModesForCameraDevice(.Rear) != nil {
                imagePicker.sourceType = .Camera
                imagePicker.mediaTypes = [kUTTypeMovie as String]
                imagePicker.allowsEditing = false
                imagePicker.delegate = self
                locationManager.startUpdatingLocation()
                print(locationManager.location)
                presentViewController(imagePicker, animated: true, completion: {})
            } else {
                postAlert("Rear camera doesn't exist", message: "Application cannot access the camera.")
            }
        } else {
            postAlert("Camera inaccessible", message: "Application cannot access the camera.")
        }
    }

我想要做的是在点击“录制视频按钮”10 秒后自动触发录制。

我找不到有关如何“触发”录音的信息。有办法做到这一点吗？

谢谢你的帮助

Answer 1

您可以在呈现 UIImagePickerController 之后添加:

imagePicker.performSelector(#selector(UIImagePickerController.startVideoCapture), withObject: nil, afterDelay: 10)