UITableView update data on row selection - ios

Question

I have a UITableView that get its data from an array and the array contains the filenames of a directory.
I am trying to make user edit filename on row selection.
My code is:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self editChattWithName:[self.listArray objectAtIndex:indexPath.row] atIndex:indexPath];
[self.tabView deselectRowAtIndexPath:indexPath animated:YES];
}
- (void)editChattWithName:(NSString*)name atIndex:(NSIndexPath *)indexPath {
UIAlertView* editAlert = [[UIAlertView alloc]
initWithTitle:nil
message:#"Edit FileName"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Update", nil];
[editAlert setAlertViewStyle:UIAlertViewStylePlainTextInput];
UITextField* nameField = [editAlert textFieldAtIndex:0];
[nameField setPlaceholder:#"New FileName"];
[nameField setText:name];
[editAlert show];
[editAlert release];
NSString *newFileName = nameField.text;
[editAlert showWithCompletion:^(UIAlertView *alertView, NSInteger buttonIndex) {
if (buttonIndex == 0) { }
else if (buttonIndex == 1) {
NSError *error;
// Edit filename inside directory
[fm moveItemAtPath:[NSString stringWithFormat:#"%#%#",directory,name] toPath:[NSString stringWithFormat:#"%#%#",directory,newFileName] error:&error];
// Update value inside array
[self.listArray replaceObjectAtIndex:indexPath.row withObject:newChatName];
// reload table data to show new filename
[self.tabView reloadData];
NSLog(#"Old Filename: %#%#",directory,name);
NSLog(#"New Filename: %#%#",directory,newFileName);
NSLog(#"Error: %#",error);
}
}];
}
The issue is that name and newFileName are having the same value name and that is resulting an error with NSFileManager saying that the file already exists.
I have tried removing [nameField setText:name] but the problem was still there.
I am out of luck and not able to find the issue, your help is much appreciated.

Answer 1

Well, if you already know that the method moveItemAtPath:toPath: is causing the error only in case that the old and the new file name are identical then it should be quite easy to catch this error:
if (![newFileName isEqualToString:name]) {
[fm moveItemAtPath:[NSString stringWithFormat:#"%#%#",directory,name] toPath:[NSString stringWithFormat:#"%#%#",directory,newFileName] error:&error];
}
Now your file will only me moved (i.e. renamed) when the new file name differs from the old name.
Edit:
Furthermore, if you want to get the new file name that the user just entered in the alert view you should put this line:
NSString *newFileName = nameField.text;
in your completion block. Otherwise it will be set when the alert view is first displayed and hence have its initial value. To put it all together:
[editAlert showWithCompletion:^(UIAlertView *alertView, NSInteger buttonIndex) {
if (buttonIndex == 1) {
NSString *newFileName = nameField.text;
NSError *error;
// Edit filename inside directory
if (![newFileName isEqualToString:name]) {
[fm moveItemAtPath:[NSString stringWithFormat:#"%#%#",directory,name] toPath:[NSString stringWithFormat:#"%#%#",directory,newFileName] error:&error];
}
// Update value inside array
[self.listArray replaceObjectAtIndex:indexPath.row withObject:newChatName];
// reload table data to show new filename
[self.tabView reloadData];
}
}];
Supplement:
In order to not confuse other users it should be noted that showWithCompletion: is not a native UIAlertView method. An Objective-C category has been created to extend UIAlertView with this method. An example can be found here.