swift popToViewController

Question

大家好，我正在学习 Swift，在这里需要一些帮助。

用户正在注册并选择了他们的图片。关闭图像选择器后，我想让 ComposeViewController 出现。

代码如下:

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: NSDictionary!) {
    let pickedImage:UIImage = info.objectForKey(UIImagePickerControllerOriginalImage) as UIImage

    //Scale Down Image
    let scaledImage = self.scaleImageWith(pickedImage, and: CGSizeMake(100,100))

    let imageData = UIImagePNGRepresentation(scaledImage)

    let imageFile:PFFile = PFFile(data: imageData)

    PFUser.currentUser().setObject(imageFile, forKey: "profileImage")
    PFUser.currentUser().saveInBackgroundWithTarget(nil, selector: nil)

    picker.dismissViewControllerAnimated(true, completion: nil)

    //this is the line seems to have problem.
    self.navigationController?.popToViewController(ComposeViewController, animated: true)
}

然后我得到了这些错误:ComposeViewController.Type' 不可转换为 'UIViewController类型名称后预期的成员名称或构造函数调用

它建议通过在 ComposeViewController 之后放置 () 来修复，但修复后它会给出更多错误。

希望有人能提供帮助。谢谢! :-)

Answer 1

let controllers = self.navigationController?.viewControllers
              for vc in controllers! {
                if vc is YourVC {
                  _ = self.navigationController?.popToViewController(vc as! YourVC, animated: true)
                }
             }