Question

我一直在为UIImagePickerController控制器使用自定义叠加层，一切正常。我已添加按钮，通过 -

在前后摄像头之间切换

 - (IBAction)changeCamera:(id)sender {
if (self.imagePicker.cameraDevice == UIImagePickerControllerCameraDeviceRear) {
    self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
}
else {
    self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
}
}

问题是，切换没有动画。我一直在使用建立在UIImagePicker之上的苹果相机应用程序，并且开关正在发生动画。我该怎么做？

Answer 1

我今天试图这样做，我能够使用以下代码：

[UIView transitionWithView:imagePickerController.view duration:1.0 options:UIViewAnimationOptionAllowAnimatedContent | UIViewAnimationOptionTransitionFlipFromLeft animations:^{
            imagePickerController.cameraDevice = UIImagePickerControllerCameraDeviceRear;
        } completion:NULL];

我希望这可以帮助任何遇到这个问题的人。

Answer 2

如果有人需要，这是接受答案的Swift代码：

UIView.transitionWithView(imagePickerController.view!, duration: 1.0, options: [.AllowAnimatedContent, .TransitionFlipFromLeft], animations: {() -> Void in
            imagePickerController.cameraDevice = .Rear
            }, completion: nil)

谢谢Pablo！

UIImagePickerController如何从后置摄像头到前置摄像头进行动画切换？

2 个答案: