For Login Check Code

Login.txt

-(IBAction)logincheck:(id)sender{
    if ([_Text1.text isEqualToString:@""] || [_Text2.text isEqualToString:@""]) {
        UIAlertController *error1 = [UIAlertController alertControllerWithTitle:@"Alert Message" message:@"Enter User Name and Password" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:nil];
        [error1 addAction:cancel];
        [self presentViewController:error1 animated:YES completion:nil];
    }
    else if ([_Text1.text isEqualToString:@"admin"] || [_Text2.text isEqualToString:@"12345"]){
        MainViewController *HomePage = [self.storyboard instantiateViewControllerWithIdentifier:@"mainView"];
        [self.navigationController pushViewController:HomePage animated:YES];
    }
    else{
        UIAlertController *error1 = [UIAlertController alertControllerWithTitle:@"Alert Message" message:@"You have used wrong User Name and Password" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleCancel handler:nil];
        [error1 addAction:cancel];
        [self presentViewController:error1 animated:YES completion:nil];
    }
}