Я использую MFMailComposeViewController для отправки почты из приложения. Я добавил код из примера Apple в UITableViewController, и все работает как ожидалось, когда я запускаю modalViewController из UIToolBarButton. Проблема возникает, когда я ставлю UIActionSheet между UIToolBarButton и MFMailComposeViewController кодом.
Я хочу предоставить пользователю возможность отправить по электронной почте или опубликовать в Facebook. Когда я вызываю MFMailComposeViewController методы после закрытия UIActionSheet, мое приложение падает, когда метод пытается загрузить modalViewController. Код ниже, есть идеи?
// UIToolBarButton generates the email string and displays the UIActionSheet with email options
- (void)onEmailButtonTouch
{
int mySection;
int myRow;
emailString = [NSString stringWithFormat:@"<b><p>Ten Essentials Check List</b><br />%@</p>", [myList valueForKey:@"listName"]];
for (mySection = 0; mySection < [[fetchedResultsController sections] count]; mySection ++)
{
NSString *sectionName = [NSString stringWithFormat:@"<p><b>%@ Group</b></p><ul>", [[[fetchedResultsController sections] objectAtIndex:mySection] name]];
emailString = [emailString stringByAppendingString:sectionName];
id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:mySection];
for (myRow = 0; myRow < [sectionInfo numberOfObjects]; myRow ++)
{
// Get the managedObject
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:myRow inSection:mySection];
NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:indexPath];
//Get the related Item object
Item *item = [managedObject valueForKey:@"item"];
NSString *itemName = [NSString stringWithFormat:@"<li>%@</li>", item.itemName];
emailString = [emailString stringByAppendingString:itemName];
}
emailString = [emailString stringByAppendingString:@"</ul>"];
}
NSLog(@"email string = :\n%@", emailString);
[self showEmailOptions];
}
// Display an UIActionSheet with email/facebook buttons
-(void)showEmailOptions
{
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"eMail Options" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:NULL otherButtonTitles:@"Send List via Email", @"Post List to Facebook", NULL];
[actionSheet showFromToolbar:self.navigationController.toolbar];
[actionSheet release];
}
// Call the MFMailComposeViewController methods if the user selects the Email button of the actioSheet
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
NSLog(@"Opening email");
[self showPicker];
}
}
-(void)showPicker
{
// This sample can run on devices running iPhone OS 2.0 or later
// The MFMailComposeViewController class is only available in iPhone OS 3.0 or later.
// So, we must verify the existence of the above class and provide a workaround for devices running
// earlier versions of the iPhone OS.
// We display an email composition interface if MFMailComposeViewController exists and the device can send emails.
// We launch the Mail application on the device, otherwise.
Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
if (mailClass != nil)
{
// We must always check whether the current device is configured for sending emails
if ([mailClass canSendMail])
{
[self displayComposerSheet];
}
else
{
[self launchMailAppOnDevice];
}
}
else
{
[self launchMailAppOnDevice];
}
}
// Displays an email composition interface inside the application. Populates all the Mail fields.
-(void)displayComposerSheet
{
MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
[picker setSubject:@"Here is your gear check list!"];
// Attach an image to the email
NSString *path = [[NSBundle mainBundle] pathForResource:@"Checkmark_icon" ofType:@"png"];
NSData *myData = [NSData dataWithContentsOfFile:path];
[picker addAttachmentData:myData mimeType:@"image/png" fileName:@"Checkmark_icon"];
// Fill out the email body text
NSString *emailBody = emailString;
[picker setMessageBody:emailBody isHTML:YES];
// CRASH HAPPENS ON THE LINE BELOW //
[self presentModalViewController:picker animated:YES];
[picker release];
}
// Dismisses the email composition interface when users tap Cancel or Send. Proceeds to update the message field with the result of the operation.
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
//message.hidden = NO;
// Notifies users about errors associated with the interface
switch (result)
{
case MFMailComposeResultCancelled:
NSLog (@"Result: canceled");
break;
case MFMailComposeResultSaved:
NSLog (@"Result: saved");
break;
case MFMailComposeResultSent:
NSLog (@"Result: sent");
break;
case MFMailComposeResultFailed:
NSLog (@"Result: failed");
break;
default:
NSLog (@"Result: not sent");
break;
}
[self dismissModalViewControllerAnimated:YES];
}
#pragma mark -
#pragma mark Workaround
// Launches the Mail application on the device.
-(void)launchMailAppOnDevice
{
NSString *recipients = @"mailto:first@example.com?cc=second@example.com,third@example.com&subject=Here is your gear check list!";
NSString *body = emailString;
NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body];
email = [email stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:email]];
}