故事板中的自定义segue Unwind Segue导致＆＃39;应用程序尝试以模态方式呈现一个活动控制器＆＃34;错误迅速4？

Question

嘿伙计我需要一个解决方案，我的自定义segue在展开后会导致崩溃，我将如何解决？

我的自定义Segue（使用perform segue调用时工作正常）：

import UIKit
class SegueFromLeft: UIStoryboardSegue {
override func perform() {
    let src = self.source
    let dst = self.destination

    src.view.superview?.insertSubview(dst.view, aboveSubview: src.view)
    dst.view.transform = CGAffineTransform(translationX: -src.view.frame.size.width, y: 0)

    UIView.animate(withDuration: 0.25,
                   delay: 0.0,
                   options: .curveEaseInOut,
                   animations: {
                    dst.view.transform = CGAffineTransform(translationX: 0, y: 0)
    },
                   completion: { finished in
                    src.present(dst, animated: false, completion: nil)
    }
    )
}

}

Screen shot of storyboard

错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller <Free.PhotoViewController: 0x7fa4ff97eaa0>.'