Swift: iOS 动画在查看 MessageController 后停止（iOS 的消息页面）

Question

我正在运行在用户按下徽标后播放动画。这是动画：

func rightRotateView(targetView: UIView, duration: Double = 5) {

    UIView.animate(withDuration: duration, delay: 0.0, options: [.repeat, .curveLinear] , animations: {
        targetView.transform = targetView.transform.rotated(by: CGFloat.pi * 5)

    }) { finished in
       // self.rightRotateView(targetView: targetView)
    }
}

长按3秒后（此时动画应该还是运行），我为用户呈现消息控制器：

 if MFMessageComposeViewController.canSendText() == true {
        print(self.urgentNumber)
        let recipients:[String] = ["\(self.urgentNumber as! String)"]
        self.messageController.messageComposeDelegate  = self as? MFMessageComposeViewControllerDelegate
        self.messageController.recipients = recipients
        self.messageController.body = "Hey,\nmy longitude: \(self.userLocation.coordinate.longitude) \nmy latitude: \(self.userLocation.coordinate.latitude)"

        self.present(self.messageController, animated: true, completion: nil)


    } else {
        //handle text messaging not available

    }

当我按下消息控件中的取消按钮时，我正在返回动画页面，但动画停止工作。我试着重新运行动画之后的现在，而在

func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {

}

但是没有用。

Answer 1

用于此 CABasicAnimation(keyPath: "transform.rotation")

Answer 2

我发现了问题，只需在完成时重新运行相同的动画，（您可以使用 CABasicAnimation 或简单地 UIView.animate）：

func rightRotateView(targetView: UIView, duration: Double = 5) {

    UIView.animate(withDuration: duration, delay: 0.0, options: [.repeat, .curveLinear] , animations: {
        targetView.transform = targetView.transform.rotated(by: CGFloat.pi * 5)

    }) { finished in
        let anim = CABasicAnimation(keyPath:"transform.rotation")
        anim.fromValue = 0.000
        anim.toValue = 360.0
        anim.speed = 0.001
        anim.repeatCount = .infinity
        targetView.layer.add(anim, forKey: "transform.rotation")
    }

}

Swift: iOS 动画在查看 MessageController 后停止（iOS 的消息页面）

Swift: iOS Animation stops after viewing the MessageController (message page of iOS)

animation

message

ios

swift