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"]];