从UIImagePickerController到UIViewController的无缝转换

Question

我有一个UIViewController我有一个按钮，可以打开UIImagePickerController。

我想要实现的是无缝从UIImagePickerController过渡到第二个UIViewController。

我试过了

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    picker.dismissViewControllerAnimated(true, completion: {
        self.performSegueWithIdentifier("toSecondVC", sender: nil)
    }
}

我也试过

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    picker.dismissViewControllerAnimated(true, completion: {
        let secondView = self.storyboard?.instantiateViewControllerWithIdentifier("secondView")
        self.presentViewController(secondView!, animated: true, completion: nil)
    }
}

两者都给出了相同的结果，基本上当我关闭UIImagePickerController时，它会在很短的时间内显示第一个视图控制器，然后转换到第二个视图控制器。

如何摆脱显示第一个视图控制器的那个短暂时刻？