When SIM is not available how should we handle MFMessageComposeViewController

I am using MFMessageComposeViewController to send text message via my App. But I have a problem when we remove the SIM and try to send message. Is there any delegate available to track whether the message will be sent /开发者_如何学编程 not?

You can use the CTTelephonyNetworkInfo class of the core telephony framework to gather information about the SIM card. Use the subscriberCellularProviderDidUpdateNotifier method to get notified about SIM card changes:

A block object that is dispatched on the default priority global dispatch queue when the user’s cellular provider information changes. This occurs, for example, if a user swaps the device’s SIM card with one from another provider, while your application is running.