我的应用程序是创建 csv 文件并通过邮件发送。但是当我丢弃邮件时，我得到了黑屏。之前的视图没有出现并且被黑屏覆盖。我查看了堆栈溢出中的各种问题和答案。但似乎没有任何效果。
- (IBAction)openMail:(id)sender
{
[self getdata];
if ([MFMailComposeViewController canSendMail])
{
MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
mailer.mailComposeDelegate = self;
[mailer setSubject:@"BMNET- Travel Log"];
NSString *CSVstring=@"Name, StartingDateNTime, EndingDateNTime, TravelType, DistanceTravelled, Amount\n" ;
NSString *CSVPath,*record;;
NSString *temporayCSV= @"" ;
for (int i=0; i<[getAmount count]; i++) {
record = [NSString stringWithFormat:@"%@, %@, %@, %@, %@, %@", [getName objectAtIndex:i], [getStartDate objectAtIndex:i], [getEndDate objectAtIndex:i],[getType objectAtIndex:i],[getDistance objectAtIndex:i],[getAmount objectAtIndex:i]];
NSLog(@"%d",i);
temporayCSV = [NSString stringWithFormat:@"%d %@ \n ",(i+1),record];
CSVstring = [CSVstring stringByAppendingFormat:temporayCSV];
NSLog(@"%@",CSVstring);
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *toRecipients = [NSArray arrayWithObjects:@"", nil];
[mailer setToRecipients:toRecipients];
CSVPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.csv", @"CSV_FormatedTable"]];
NSFileManager *fileManager;
//add our file to the path
[fileManager createFileAtPath:CSVPath contents:[CSVstring dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
NSData *rolesCSVData =[NSData dataWithContentsOfFile:CSVPath];
NSLog(@"The data is %@",CSVstring);
//create my data to append
NSFileHandle *handle;
handle = [NSFileHandle fileHandleForWritingAtPath: CSVPath ];
//say to handle where's the file fo write
[handle truncateFileAtOffset:[handle seekToEndOfFile]];
//position handle cursor to the end of file
[handle writeData:[data dataUsingEncoding:NSUTF8StringEncoding]];
//write data to with the right encoding
[mailer addAttachmentData:rolesCSVData mimeType:@"text/csv" fileName:@"Log"];
NSString *emailBody = @"Attachment of Log";
[mailer setMessageBody:emailBody isHTML:NO];
[self presentModalViewController:mailer animated:YES];
mailer.modalPresentationStyle = UIModalPresentationPageSheet;
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
message:@"Your device doesn't support the composer sheet"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
}
}
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
switch (result)
{
case MFMailComposeResultCancelled:
NSLog(@"Mail cancelled: you cancelled the operation and no email message was queued.");
break;
case MFMailComposeResultSaved:
NSLog(@"Mail saved: you saved the email message in the drafts folder.");
break;
case MFMailComposeResultSent:
NSLog(@"Mail send: the email message is queued in the outbox. It is ready to send.");
break;
case MFMailComposeResultFailed:
NSLog(@"Mail failed: the email message was not saved or queued, possibly due to an error.");
break;
default:
NSLog(@"Mail not sent.");
break;
}
// Remove the mail view
[self dismissModalViewControllerAnimated:YES];
}