ローカルにファイル保存

    //Get Directory path

    NSString *bundleID = [[NSBundle mainBundle] bundleIdentifier];

    NSFileManager *fm = [NSFileManager defaultManager];

    NSURL *dirPath = nil;

    

    NSArray *appSupportDir = [fm URLsForDirectory:NSApplicationSupportDirectory inDomains:NSUserDomainMask];

    

    if ([appSupportDir count ] >0)

    {

        dirPath= [[appSupportDir objectAtIndex:0]URLByAppendingPathComponent:bundleID];

        NSError *theErr = nil;

        if (![fm createDirectoryAtURL:dirPath withIntermediateDirectories:YES attributes:nil error:&theErr])

        {

            //error process

        }

    }

    

    //Write

    dirPath = [dirPath URLByAppendingPathComponent:@"aaa.txt"];

    

    BOOL result = [str writeToURL:dirPath atomically:YES encoding:NSUTF8StringEncoding error:&err];

    

    if (result) NSLog(@"Success write");

    

    //Read

    NSString *str1 = [NSString stringWithContentsOfURL:dirPath encoding:NSUTF8StringEncoding error:&err];

    

    NSLog(@"Read: %@",str1);