swift 错误 : Snapshotting a view that has not been rendered results in an empty snapshot

Question

我已经阅读了该网站上的许多帖子(尤其是:iOS 8 Snapshotting a view that has not been rendered results in an empty snapshot)，但没有针对 Swift 的答案。

我想我会问这里的人群是否解决了这个问题。

我在 iPhone 6 上使用 Xcode 6.2、iOS 8.2

我的代码:

if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera){
        if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)){
            imag = UIImagePickerController()
            imag.delegate = self
            imag.sourceType = UIImagePickerControllerSourceType.Camera;
            imag.allowsEditing = false
            imag.mediaTypes = [kUTTypeImage]
            imag.showsCameraControls = false
            self.presentViewController(imag, animated: true, completion: nil)
            imag.cameraDevice = UIImagePickerControllerCameraDevice.Front
            imag.takePicture()
        }
    }

如果我将此 (self.presentViewController(imag, animated: true, completion: nil)) 更改为 (self.presentViewController(imag, animated: YES, completion: nil))，我得到错误并切换回 true .

Answer 1

我在 console 中收到相同的警告，但其他一切都应该有效。如果未显示相机，请检查设备设置中的相机权限。