往往系统自带的UITabbar 不能满足我们的样式或者颜色设计，所以需要调整UITabbar。

1、自定义UITabbar，也是我学到的第一种方式（简单暴力）。

先记录一下思路：

首先，隐藏系统自带的Tabbar，在init 方法中:self.tabBar.hidden =
YES;

然后自定义一个高度49px的UIView,在UIView上添加多个UIButton，我们通过UIView、UIButton的颜色、样式修改来实现我们要的效果。

记录一段我常用的自定义UITabbbar的代码：

//初始化tabbar

- (void)_initTabbarView

{

    _tabbarView = [[UIViewalloc]initWithFrame:CGRectMake(0,ScreenHeight-49,ScreenWidth,49)];

    [self.viewaddSubview:_tabbarView];

    //给tabbarView添加背景图片

    UIImageView *tabbarGroundImage = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"tabbar_background.png"]];

    tabbarGroundImage.frame =_tabbarView.bounds;

    [_tabbarViewaddSubview:tabbarGroundImage];

    NSArray *bgroud =@[@"tabbar_home.png",@"tabbar_message_center.png",@"tabbar_profile.png",@"tabbar_discover.png",@"tabbar_more.png"];

    NSArray *heightBground =@[@"tabbar_home_highlighted.png",@"tabbar_message_center_highlighted.png",@"tabbar_profile_highlighted.png",@"tabbar_discover_highlighted.png",@"tabbar_more_highlighted.png"];

    for (int i = 0; i < bgroud.count; i++) {

        NSString  *backImage = bgroud[i];

        NSString  *heightImage = heightBground[i];

        UIButton *button = [[UIButtonalloc]initWithFrame:CGRectMake((64-30)/2+(i*64), (49-30)/2,30,30)];

        button.showsTouchWhenHighlighted =YES;

        button.tag = i;

        [button setImage:[UIImageimageNamed:backImage]forState:UIControlStateNormal];

        [button setImage:[UIImageimageNamed:heightImage]forState:UIControlStateHighlighted];

        [button addTarget:selfaction:@selector(selectedTab:)forControlEvents:UIControlEventTouchUpInside];

        [_tabbarViewaddSubview:button];

    }

    _sliderView = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"tabbar_slider.png"]];

    _sliderView.backgroundColor = [UIColorclearColor];

    _sliderView.frame = CGRectMake((64-15)/2,5,15,44);

    [_tabbarViewaddSubview:_sliderView];

}

2、直接修改系统自带的UITabbar (适用iOS 5—iOS 7)

修改背景颜色：

//设置tabbar的背景色

UIView *bgView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,320,49)];

bgView.backgroundColor = [UIColororangeColor];

[self.tabBarinsertSubview:bgViewatIndex:1];

 self.tabBar.opaque = YES;

然后设置图片

UITabBarItem *item1 = [[UITabBarItemalloc]initWithTitle:@"会话"image:niltag:2];

[item1 setFinishedSelectedImage:[UIImageimageNamed:@"com_icon_hover"]withFinishedUnselectedImage:[UIImageimageNamed:@"com_icon"]];

firstVC.tabBarItem = item1;

3、直接修改系统自带的UITabbar (适用iOS 7以上）

//设置tabbar的背景色

UIView *bgView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,320,49)];

bgView.backgroundColor = [UIColororangeColor];

[self.tabBarinsertSubview:bgViewatIndex:1];

 self.tabBar.opaque = YES;

UIImage *image1 = [[UIImageimageNamed:@"com_icon"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    UIImage *image1Selected = [[UIImageimageNamed:@"com_icon_hover"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

UITabBarItem *item1 = [[UITabBarItemalloc]initWithTitle:nilimage:image1selectedImage:image1Selected];

firstVC.tabBarItem = item1;

这里关键是要设置图片的 RenderingMode.