Issue saving to NSApplicationSupportDirectory - ios

Question

I'm having a strange issue saving to NSApplicationSupportDirectory on my iPad app.
I've been using this data structure for a long time with no issues, it only appears during the first two loads of the program.
The first time the app opens, I open up a file from the mainBundle and re-save it as a default settings file, which is then used to store any changes to settings in the application.
The second time I open the app, the file doesn't seem to exist yet, so it creates it again! The third time and after, all is well. I can't figure out why it isn't saving it the first time.
Sorry if this is messy - it's a part of hundreds of pages of code!
Here's my initialization:
///inside the init of the object
NSFileManager* fileManager = [[NSFileManager alloc] init];
NSError* err = nil;
NSURL* dir = [fileManager URLForDirectory:NSApplicationSupportDirectory
inDomain:NSUserDomainMask
appropriateForURL:nil
create:YES
error:&err];
if (err) {
NSLog(#"error finding app support directory %#", err);
}
currentSettingsURL = [NSURL URLWithString:kCurrentSettingsFilename relativeToURL:dir];
if(![fileManager fileExistsAtPath:[currentSettingsURL path]])[self createDefaultFile];
NSArray* files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[dir path] error:&err];
NSLog(#"files %#", files);
where the file is created if it doesn't exist.
-(void)createDefaultFile{
NSURL* readURL = [[NSBundle mainBundle] URLForResource:#"smooth" withExtension:nil];
NSMutableData* tempData = [NSMutableData dataWithContentsOfURL:readURL];
NSKeyedUnarchiver* unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:tempData];
///re archive
[self setCurrentPresets:[unarchiver decodeObjectForKey:#"presetData"]];
}
-(void)setCurrentPresets:(NSMutableArray*)presets{
currentPresets = presets;
[self saveCurrentSettings];
}
here is where the file is saved
-(void)saveCurrentSettings{
data = [[NSMutableData alloc] init];
NSKeyedArchiver* archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:currentPresets forKey:kCurrentSettingsFilename];
[archiver finishEncoding];
if(![data writeToURL:currentSettingsURL atomically:YES])NSLog(#"error saving file");
}

Answer 1

I simply needed to tell it my NSApplicationSupportDirectory was a folder..
NSURL* dir = [fileManager URLForDirectory:NSApplicationSupportDirectory
inDomain:NSUserDomainMask
appropriateForURL:nil
create:YES
error:&err];
if (err) {
NSLog(#"error finding app support directory %#", err);
}
NSURL* folder = [[NSURL alloc] initFileURLWithPath:[dir path] isDirectory:YES];
currentSettingsURL = [NSURL URLWithString:kCurrentSettingsFilename relativeToURL:folder];