最近iOS开发中遇到的问题

背景：最近在做一款通讯软件

1.通话后并dismiss通话的controller后，视图会导致下移的情况出现，比如我的uitabbar就出现下移，通过

[self performSelector:@selector(dismissSelfController) withObject:nil afterDelay:1.0f];

使界面过段时间才被dismiss,可以解决上述问题。

2.使用uitabbarcontroller包含几个继承自UINavgationController的controller设置title无效，通过

    LoginViewController *loginVC = [[LoginViewController alloc]init];

    UINavigationController *navVC1 = [[UINavigationController alloc]initWithRootViewController:loginVC];

    loginVC.title = @"个人";

    loginVC.tabBarItem.title = @"个人";

    

    RecentViewController *recentVC = [[RecentViewController alloc]init];

    recentVC.title = @"最近联系人";

    UINavigationController *navVC2 = [[UINavigationController alloc]initWithRootViewController:recentVC];

    

    WincallViewController *wincallVC = [[WincallViewController alloc]init];

    wincallVC.tabBarItem.image = [UIImage imageNamed:@"呼叫"];

    wincallVC.title = @"电话";

    UINavigationController *navVC3 = [[UINavigationController alloc]initWithRootViewController:wincallVC];

    // 设置tabbar图片选中后颜色

    self.tabBar.tintColor = THEME_COLOR;

    self.viewControllers = [NSArray arrayWithObjects:navVC2, navVC3, navVC1, nil];

    self.selectedIndex = 1;

    

    // 设置tabbar title相关属性

    for(int i=0; i<self.tabBar.items.count; i++) {

        UITabBarItem *item = [self.tabBar.items objectAtIndex:i];

        NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:[UIColor grayColor],NSForegroundColorAttributeName, nil];

        [item setTitleTextAttributes:dict forState:UIControlStateNormal];

        

        NSDictionary *dict2 = [NSDictionary dictionaryWithObjectsAndKeys:THEME_COLOR,

                               NSForegroundColorAttributeName,nil];

        [item setTitleTextAttributes:dict2 forState:UIControlStateSelected];

    }