取消选项在iOS中的消息编辑器中不起作用

Question

我有一个简单的问题，取消选项在消息编写器中不起作用;我搜索了API引用，但是我没有找到可以帮助我的代码行。

我怎么能解决这个问题？

 messageComposer.messageComposeDelegate = self
                messageComposer.recipients = textMessageRecipients
                messageComposer.body = "I'm Lost, I need some Help, Here's my Location)"
                self.navigationController?.presentViewController(messageComposer, animated: true){}
                self.presentViewController(messageComposer, animated: true, completion: nil)

message composer Screen Shot