ios子线程下更新ui(performSelectorOnMainThread)

因为苹果不允许在主线程以外的线程中对ui进行操作，所以需要将操作ui的部分放到主线程中执行，所以在子线程中，可以使用performSelectorOnMainThread去创建一个新的线程执行你的函数，支持传入参数。

NSArray *array=@[username,userpwd];
[self performSelectorOnMainThread:
  @selector(push:) withObject:array waitUntilDone:NO];

-(void)push:(NSArray *)array{//用户名，密码
    UIStoryboard *story =
      [UIStoryboard storyboardWithName:@"Main"bundle:[NSBundlemainBundle]];
    UIViewController *myView =
      [story instantiateViewControllerWithIdentifier:@"TYLogin"];
    [myView setValue:array[0] forKey:@"objUser"];
    [myView setValue:array[1] forKey:@"objPwd"];
    [self.navigationController pushViewController:myView animated:YES];
}