Copies txtFile from resource to document if not already present.

NSFileManager *fileManager = [NSFileManager defaultManager];NSError *error;NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [paths objectAtIndex:0];NSString *txtPath = [documentsDirectory stringByAppendingPathComponent:@"txtFile.txt"];if ([fileManager fileExistsAtPath:txtPath] == NO) {    NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"txtFile" ofType:@"txt"];    [fileManager copyItemAtPath:resourcePath toPath:txtPath error:&error];}

If you want to overwrite every time then try this:

if ([fileManager fileExistsAtPath:txtPath] == YES) {    [fileManager removeItemAtPath:txtPath error:&error];}NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"txtFile" ofType:@"txt"];[fileManager copyItemAtPath:resourcePath toPath:txtPath error:&error];

Swift 3

code for file is exist or not, if not then copy.

func CheckFileisExistOrNot(strPath:String) {    let filemgr = FileManager.default    if !filemgr.fileExists(atPath: strPath) {        let resorcePath = Bundle.main.path(forResource: "\(Global.g_databaseName)", ofType: ".db")        do {            try filemgr.copyItem(atPath: resorcePath!, toPath: strPath)        }catch{            print("Error for file write")        }    }}

NSFileManager *fileManager = [NSFileManager defaultManager];NSError *error;NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [[paths objectAtIndex:0]stringByAppendingString:@"csvfile"];NSString *txtPath = [documentsDirectory stringByAppendingPathComponent:@"sample.csv"];if ([fileManager fileExistsAtPath:txtPath] == NO) {    NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"sample" ofType:@".csv"];    [fileManager copyItemAtPath:resourcePath toPath:txtPath error:&error];