MFMessageComposer取消按鈕在iOS 11中不可見

Question

出現消息撰寫器后，右上角的取消按鈕在iOS 11設備中不可見。 如屏幕截圖所示，“取消”按鈕有效，但不可見。 一旦我們按下它，屏幕就會關閉。

Answer 1

我已經這樣嘗試過：

class ViewController: UIViewController, MFMessageComposeViewControllerDelegate {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func Messages(_ sender: UIButton) {
    if MFMessageComposeViewController.canSendText() == true {
        let recipients:[String] = ["1500"]
        let messageController = MFMessageComposeViewController()
        messageController.messageComposeDelegate  = self
        messageController.recipients = recipients
        messageController.body = "Your_text"
        self.present(messageController, animated: true, completion: nil)
    } else {
        //handle text messaging not available
    }
}

func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
    controller.dismiss(animated: true, completion: nil)
}

}

1. 添加了Messages和MessageUI框架，並導入到視圖控制器中。

2. 屏幕截圖：

圖片 ：