我刚刚从Xcode 6 Beta 3升级到Beta 4.在3我的应用程序完美编译然而在4我有以下错误.任何人都可以解释并提供解决方案.
func messageComposeViewController(sendMsg: MFMessageComposeViewController, didFinishWithResult result: MessageComposeResult) {
switch result {
case MessageComposeResultSent : //Error: MessageComposeResult is not convertible to _OptionalNilComparisonType
label2.text = "Msg Sent"
case MessageComposeResultCancelled : //Error: MessageComposeResult is not convertible to _OptionalNilComparisonType
label2.text = "Msg Send Cancelled"
case MessageComposeResultFailed : //Error: MessageComposeResult is not convertible to _OptionalNilComparisonType
label2.text = "Msg Send Failed"
default:
label2.text = "Msg Error"
}
self.dismissViewControllerAnimated(true, completion: nil)
self.reloadInputViews()
}