Ios MFMailComposeViewController not displaing - iphone

Question

I trying to write rhodes native extension extension for opening iOS MailComposer.
Now code "works", but MFMailComposeViewController not displaying and xcode shows warning:
Attempt to present <MFMailComposeViewController: 0x12b60840> on <Iosmailto: 0xc1898d0> whose view is not in the window hierarchy!
I read that UIViewControllers must be in hierarchy, but i can't provide this from Rhodes ruby code or clear-C extension wrapper.
Now i'm trying to present my UIViewController with MFMailComposeController from [UIApplication sharedApplication].keyWindow.rootViewController but mail composer not show yet.
interface from iosmailto.h:
#interface Iosmailto : UIViewController<MFMailComposeViewControllerDelegate>
{
}
#property(nonatomic, assign) id delegate;
//-(IBAction)send_mail:(id)sender;
#end
implementation from iosmailto.m:
#implementation Iosmailto
- (void)viewDidLoad {
[super viewDidLoad];
[self send_mail];
}
- (void)send_mail {
if ([MFMailComposeViewController canSendMail]) {
MFMailComposeViewController *composer = [[MFMailComposeViewController alloc] init];
composer.mailComposeDelegate = self;
[composer setSubject:[NSString stringWithUTF8String:subj]];
NSArray *recipients_array = [NSArray arrayWithObject:[NSString stringWithUTF8String:recipients]];
[composer setToRecipients:recipients_array];
NSString *composerBody = [NSString stringWithUTF8String:message];
[composer setMessageBody:composerBody isHTML:NO];
[composer setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentModalViewController:composer animated:YES];
[composer release];
} else {
NSLog(#"Device is unable to send email in its current state.");
}
}
/* some unnecessary for this question methods */
#end
And C function defined in iosmailto.m thats called from Rhodes:
// find root vc
UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;
// find topmost vc
while (topController.presentedViewController) {
topController = topController.presentedViewController;
}
iosmailer = [[Iosmailto alloc] init];
iosmailer.delegate = topController;
[topController presentViewController:iosmailer animated:YES completion:nil];
This app is not for AppStore. Hacks is welcome if needed.
Update init for Iosmailto:
- (id)init
{
self = [super initWithNibName:nil bundle:nil];
return self;
}
Update 2 The short version of this code (without UIViewController wrapper) was my starting point. That's don't work too. And this have the same warning and one more:
UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;
while (topController.presentedViewController) {
topController = topController.presentedViewController;
}
if ([MFMailComposeViewController canSendMail]) {
MFMailComposeViewController *composer = [[MFMailComposeViewController alloc] init];
composer.mailComposeDelegate = (id<MFMailComposeViewControllerDelegate>)topController ;
[composer setSubject:[NSString stringWithUTF8String:subj]];
NSArray *recipients_array = [NSArray arrayWithObject:[NSString stringWithUTF8String:recipients]];
[composer setToRecipients:recipients_array];
NSString *composerBody = [NSString stringWithUTF8String:message];
[composer setMessageBody:composerBody isHTML:NO];
[composer setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[topController presentModalViewController:composer animated:YES];
[composer release];
} else {
}

Answer 1

Use this code to present view controller
[[[[[UIApplication sharedApplication] delegate] window] rootViewController] presentViewController:composer
animated:YES
completion:nil];

Answer 2

Ok I think the problem is that your UIViewController doesn't have anything in its view property because you aren't using a .xib file to initialize it. See this question which programmatically creates a UIView and assigns it to the UIViewController's view property. I think that's the right way to go. See the implementation of their -(void)loadView method.
Your use-case is also a little strange, since it looks like your Iosmailto UIViewController doesn't have any content, and you're just using it as a wrapper around MFMailComposeViewController--you might consider reimplementing your C method to directly create a MFMailComposeViewController without the unnecessary layer of indirection of this unnecessary UIViewController that doesn't display anything itself.