在iOS8系统下，UITabbar上的item自定义背景色和图片问题

在iOS8系统下，UITabbar上的item自定义背景色和图片，初始设置了红色没效果系统默认颜色-蓝色

解决方法：

//选择的图片

    UITabBar *tabBar = self.tabBar;

    UITabBarItem *tabBarItem1 = [tabBar.items objectAtIndex:0];

    UITabBarItem *tabBarItem2 = [tabBar.items objectAtIndex:1];

    UITabBarItem *tabBarItem3 = [tabBar.items objectAtIndex:2];

   tabBarItem1.title = @"title1";

    tabBarItem2.title = @"title2";

     UIImage* selectedImage = [UIImage imageNamed:@"xxxx.png"];

  //声明这张图片用原图(别渲染)

    selectedImage = [selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    [tabBarItem1 setFinishedSelectedImage:selectedImage withFinishedUnselectedImage:[UIImage imageNamed:@"xxx.png"]];

    [tabBarItem2 setFinishedSelectedImage:[UIImage imageNamed:@"xxxx.png"]withFinishedUnselectedImage:[UIImage imageNamed:@"xxxx.png"]];