设置tabBarItem字体颜色和图片颜色

第一种方法：

[self.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor blackColor]} forState:UIControlStateSelected];

第二种方法：

[self.tabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor redColor],NSForegroundColorAttributeName, nil] forState:UIControlStateNormal];

第三种方法：

self.tabBarController.tabBar.tintColor = [UIColor colorWithRed:255.0/255.0 green:124.0/255.0 blue:56.0/255.0 alpha:1];

设置图片原始颜色

UIImage *image = [self.tabBarItem.selectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

       self.tabBarItem.selectedImage = image;