一个自定义 ViewController，它嵌入了两个额外的 UIViewController 对象，将一个显示在另一个前面。顶层的 ViewController 可以被拖动到开发者指定的方向，以显示底层的 ViewController。
用法相当简单。即将提供 IB 直接集成，但在此期间，这正是你在寻找的模式
将依赖添加到您的 Podfile
platform :ios
pod 'CSRevealingViewController'
...运行 pod install 以安装依赖项。
在您的 storyboard 中，将根 ViewController 的自定义类设置为 CSRevealingViewController，并实例化您想要嵌入其中的 ViewControllers。确保为这两个提供您能记住的合理标识符。
然后在您的 AppDelegate 中
#import <CSRevealingViewController/CSRevealingViewController.h>
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Get the root ViewController, cast into what it really is. Also grab its storyboard, we'll need that.
CSRevealingViewController *rVC = (CSRevealingViewController *)self.window.rootViewController;
UIStoryboard *mainStoryboard = rVC.storyboard;
// Set up the revealing behavior.
rVC.overhang = 50.0f; // "Overhang" that the top VC shows when revealing the bottom VC.
rVC.direction = CSRevealingSwipeDirectionUp; // Which direction you want to swipe to reveal.
rVC.shouldRespondToEdgeTap = YES; // Do you want to respond to tapping the "overhang" edge of the top VC to make it reveal?
// Retrieve and set the top and bottom ViewControllers.
UIViewController *back = [mainStoryboard instantiateViewControllerWithIdentifier:@"BackRootVC"];
UIViewController *front = [mainStoryboard instantiateViewControllerWithIdentifier:@"FrontRootVC"];
rVC.backViewController = back;
rVC.frontViewController = front;
return YES;
}