iphone MFMailComposeViewController

Is there a way to dismiss the keyboard from MFMailComposeViewController ? If the user rotates the device, I am lo开发者_如何学JAVAading a separate controller without "send" or "cancel" being pressed, and the keyboard is remaining on screen. Is there an way to dismiss the keyboard without "done" or "send" being pressed?

You can find the first responder and ask it to resign active which should dismiss the keyboard.

    UIWindow* keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView* firstResponder = [keyWindow performSelector:@selector(firstResponder)];
[firstResponder resignFirstResponder];