修改系统TabBar 高度 、填充色、 透明

• (void)viewDidLayoutSubviews {

  [super viewDidLayoutSubviews];

  CGRect frame = self.tabBar.frame;

  frame.size.height = 55;

  frame.origin.y = self.view.frame.size.height - frame.size.height;

  self.tabBar.frame = frame;

  self.tabBar.backgroundColor = mRGBToColor(0xeaeaea);

  self.tabBar.barStyle = UIBarStyleBlack;

  //此处需要设置barStyle，否则颜色会分成上下两层

}

修改 导航条 填充色 ：

1. [self.tabBar setBarTintColor:ZRMainColor];

2. UIView *view = [[UIView alloc]init];
   view.backgroundColor = [UIColor redColor];
   view.frame = self.tabBar.bounds;
   [[UITabBar appearance] insertSubview:view atIndex:0];

3. [[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"tabBarBackgroundImage"]];
   // [UITabBar appearance].translucent = NO;

导航条 透明，顶端线也透明：
[self.tabBar setShadowImage:img];
[self.tabBar setBackgroundImage:[[UIImage alloc]init]];

appearanceWhenContainedInInstancesOfClasses 与 appearance 区别，前者 设置几个类 的TabBar 属性 后者 统一设置

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