Question

I’m trying to download and cache data in iPhone document directory. I would like to be able to check to see if a file exists and populate my UITableViewCell with the local data if it exists, and load the data remotely if it does not.

Here is the code I am using to download the data.

    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [paths objectAtIndex:0];
    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"Successfully downloaded file to %@", path);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"The Error Is: %@", error);
    }];

Answer 1

NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *pathToMyFile = [path stringByAppendingPathComponent:@"myDataFile"];
if ([fileManager fileExistsAtPath:pathToMyFile]) {
    // file exists
}
else {
    // file doesn't exist
}