how to copy file from main bundle to Document Folder - ios

Question

I want to check one file in Document folder.I want if this file not exist in document folder copy it from main bundle to document folder. I write this code and this file to be copy but my problem here.....!!!! my file is .sqlite file (Database file) and when copy to document folder hasn't data in self!!!! why??? while the this file when is in main bundle has data in self.
this is my code but I don't know why not work!!!!
#define DataName #"mydatabase.sqlite"
- (void)viewDidLoad
{
[self CopyDatabase];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (NSString*)DatabasePath
{
NSArray *Paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *DocumentDir = [Paths objectAtIndex:0];
//NSLog(#"%#",DocumentDir);
return [DocumentDir stringByAppendingPathComponent:DataName];
}
- (void)CopyDatabase
{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:[self DatabasePath]];
NSString *FileDB = [[[NSBundle mainBundle]resourcePath]stringByAppendingPathComponent:DataName];
if (success)
{
NSLog(#"File Exist");
return;
}
else
{
[fileManager copyItemAtPath:FileDB toPath:[self DatabasePath] error:nil];
}
}

Answer 1

I don't think your documents folder is updating because an older version of that db exists. You can purge your documents directory with the following method, and add it to the top of your viewDidLoad:
- (void)viewDidLoad
{
[self purgeDocumentsDirectory];
[self CopyDatabase];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)purgeDocumentsDirectory
{
NSLog(#"Purging Documents Directory...");
NSString *folderPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSError *error = nil;
for (NSString *file in [[NSFileManager defaultManager] contentsOfDirectoryAtPath:folderPath error:&error]) {
[[NSFileManager defaultManager] removeItemAtPath:[folderPath stringByAppendingPathComponent:file] error:&error];
}
}

Answer 2

This is my solution
-(void) copytoDocument {
NSString *openFile ;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pgnPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.text", #"100_Greatest_games"]];
if ([fileManager fileExistsAtPath:pgnPath] == NO)
{
NSString *resourcePath = [[NSBundle mainBundle] pathForResource:#"100_Greatest_games" ofType:#"text"];
[fileManager copyItemAtPath:resourcePath toPath:pgnPath error:&error];
if (error) {
NSLog(#"Error on copying file: %#\nfrom path: %#\ntoPath: %#", error, resourcePath, pgnPath);
}
}
}