MFMailComposeViewController: issues with UITextField and UIAlertController after dismissal - ios

Question

I have two issues after usage of MFMailComposeViewController in my application:
After the MFMailComposeViewController is dismissed, the UITextField text on my initial ViewController is cleared
When attempting to display a UIAlertController to indicate a MFMailComposeResult, it fails to display giving a error in the log.
For issue 1: This is my MFMailComposeViewController code. It is an action of a UIAlertController (with UIAlertControllerStyleActionSheet).
UIAlertAction *email = [UIAlertAction
actionWithTitle:#"Email the link"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
// composes new mail message with link
NSString *messageBody = self.link.text;
MFMailComposeViewController *mc = [[MFMailComposeViewController alloc] init];
mc.mailComposeDelegate = self;
[mc setMessageBody:messageBody isHTML:NO];
// customises UI to match application
[[mc navigationBar] setTintColor:[UIColor whiteColor]];
[self presentViewController:mc animated:YES completion:^{
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
[self setNeedsStatusBarAppearanceUpdate];
}];
[view dismissViewControllerAnimated:YES completion:nil];
}];
For issue 2: this is my code for displaying an appropriate UIAlertController for each relevant MFMailComposeResult.
- (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
switch (result)
{
case MFMailComposeResultCancelled:{
UIAlertController *alert= [UIAlertController
alertControllerWithTitle:#"SearchMe"
message:#"The composition of this email has been cancelled."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *done = [UIAlertAction
actionWithTitle:#"Done"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:done];
[self presentViewController:alert animated:YES completion:nil];
[alert dismissViewControllerAnimated:YES completion:nil];
}
break;
case MFMailComposeResultSaved:{
UIAlertController *alert= [UIAlertController
alertControllerWithTitle:#"SearchMe"
message:#"The composition of this email has saved as a draft."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *done = [UIAlertAction
actionWithTitle:#"Done"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:done];
[self presentViewController:alert animated:YES completion:nil];
[alert dismissViewControllerAnimated:YES completion:nil];
}
break;
case MFMailComposeResultSent:{
UIAlertController *alert= [UIAlertController
alertControllerWithTitle:#"SearchMe"
message:#"The composition of this email has been sent."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *done = [UIAlertAction
actionWithTitle:#"Done"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:done];
[self presentViewController:alert animated:YES completion:nil];
[alert dismissViewControllerAnimated:YES completion:nil];
}
break;
case MFMailComposeResultFailed:
{
UIAlertController *alert= [UIAlertController
alertControllerWithTitle:#"SearchMe"
message:#"The composition of this email has failed. Please try again."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *done = [UIAlertAction
actionWithTitle:#"Done"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:done];
[self presentViewController:alert animated:YES completion:nil];
[alert dismissViewControllerAnimated:YES completion:nil];
}
break;
default:
break;
}
[self dismissViewControllerAnimated:YES completion:NULL];
}
The error given in the log is this:
Warning: Attempt to present <UIAlertController: 0x14ed58b90> on <ViewController: 0x14ee1f7f0> whose view is not in the window hierarchy!