Open UIActivityViewController for sharing

NSString *content = @"hello world 123123123";
//NSURL *url = [NSURL URLWithString:@"http://google.com"];
//UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:_picUrl]];
UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[content] applicationActivities:nil];
activityViewController.excludedActivityTypes = @[UIActivityTypeAssignToContact, UIActivityTypeCopyToPasteboard, UIActivityTypePrint];
[self.navigationController presentViewController:activityViewController animated:YES completion:nil];