添加 UINavigationController

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添加UINavigationController实现像qq一样的通过下边的图标实现页面的转换
具体代码如下：
mainTVC *main=[[mainTVC alloc]init];
UINavigationController *NVC1 = [[UINavigationController alloc]initWithRootViewController:main];
NVC1.tabBarItem.title=@”主页”;
NVC1.tabBarItem.image=[UIImage imageNamed:@”zhuye_32.png”];

centerTVC *center=[[centerTVC alloc]init];
UINavigationController *NVC2=[[UINavigationController alloc]initWithRootViewController:center];
NVC2.tabBarItem.title=@"个人中心";
NVC2.tabBarItem.image=[UIImage imageNamed:@"geren_32.png"];

UITabBarController *tabc=[[UITabBarController alloc]init];
tabc.viewControllers=@[NVC1,NVC2];
tabBarController.tabBar.translucent = NO;//translucent一个布尔值，指示选项卡栏是否是半透明的。
for (UINavigationController *nVC in tabc.viewControllers) {
    [nVC.navigationBar  setBarTintColor:[UIColor colorWithRed:0x00/255.0 green:0xb2/255.0 blue:0xee/255.0 alpha:1.0]];
}

[self presentViewController:tabc animated:NO completion:nil];