最近在研究iOS程序的侧边栏，因为发现渐渐的iOS的程序也开始走侧边栏的风格了，QQ，今日头条，Path(Path算最早出现侧边栏的app了，所以也把侧边栏效果说成是Path效果)，所以就研究了下。
然后发现Git Hub上有很多侧边栏的控件，这些控件效果也都挺玄的，但是我想找到不用第三方控件自己实现侧边栏呢？后来参照这篇blog，然后自己搞了下，算搞清楚了。下面详细介绍一下吧。
1.
首先我们需要在storyboard里面新建3个view controlle，这里也可以是navigation controller，但是我还是习惯直接用view controller就可以了，跳转都自己来实现。
2.
接下来需要新建3个类，
ContainerViewController是一个容器类的VC，作用是放置MainVC和SideVC，就好比TabbarViewController一样，它只是一个容器，真正调整页面的是在其他VC中。
3.
先不用管这3个ViewController如何实现，我们转到storyboard中，分别把设置3个ViewController的identifier，像这个样子
ContainerViewController可以不设置storyboard，但是mainVC和sideVC一定要设置好storyboard ID，然后你还可以自己编辑一下Main VC和sideVC，这样可以更清晰地看到侧边栏的效果。
最终的StoryBoard是这样的：
最上面是ContainerViewController，接下来从右到左分别是MainViewController和SideViewController。
4.
好了，接下来我们就开始coding把。我这里想要做的效果是滑屏或者点击mainVC左上角的按钮都可以打开侧边栏，然后当侧边栏显示的时候，滑屏或者点击右侧的mainVC，都能隐藏侧边栏。
我们一步一步来分析代码吧：
其实主要是ContainerViewController
ContainerViewController.h
// 这个相当于是容器的VC，里面存放主界面和侧边栏#import <UIKit/UIKit.h>#import "MainViewController.h"#import "SideViewController.h"@interface ContainerViewController : UIViewController<UIGestureRecognizerDelegate>{}@property(nonatomic, strong) MainViewController *centerController;@property(nonatomic, strong) SideViewController *leftController;- (void)showSideView;- (void)hideSideView;@end
我们import了mainVC和sideVC，然后定义了两个property和两个method
ContainerViewController.m
//#import "ContainerViewController.h"@interface ContainerViewController ()@end@implementation ContainerViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];_centerController = (MainViewController *)[storyboard instantiateViewControllerWithIdentifier:@"MainViewController"];_centerController.fatherViewController = self;_leftController = (SideViewController *)[storyboard instantiateViewControllerWithIdentifier:@"LeftViewController"];[self.view addSubview:_centerController.view];[_centerController.view setTag:1];[_centerController.view setFrame:self.view.bounds];[self.view addSubview:_leftController.view];[_leftController.view setTag:2];[_leftController.view setFrame:self.view.bounds];[self.view bringSubviewToFront:_centerController.view];//add swipe gestureUISwipeGestureRecognizer *swipeGestureRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];[swipeGestureRight setDirection:UISwipeGestureRecognizerDirectionRight];[_centerController.view addGestureRecognizer:swipeGestureRight];UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)];[swipeGestureLeft setDirection:UISwipeGestureRecognizerDirectionLeft];[_centerController.view addGestureRecognizer:swipeGestureLeft];}-(void) swipeGesture:(UISwipeGestureRecognizer *)swipeGestureRecognizer {CALayer *layer = [_centerController.view layer];layer.shadowColor = [UIColor blackColor].CGColor;layer.shadowOffset = CGSizeMake(1, 1);layer.shadowOpacity = 1;layer.shadowRadius = 20.0;if (swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionRight) {[self showSideView];}if (swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionLeft) {[self hideSideView];}}// 显示侧边栏，单独写成一个函数，供mainVC点击头像时调用- (void)showSideView{[_leftController.view setHidden:NO];[UIView beginAnimations:nil context:nil];[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];if (_centerController.view.frame.origin.x == self.view.frame.origin.x || _centerController.view.frame.origin.x == -200) {[_centerController.view setFrame:CGRectMake(_centerController.view.frame.origin.x+200, _centerController.view.frame.origin.y, _centerController.view.frame.size.width, _centerController.view.frame.size.height)];}[UIView commitAnimations];}- (void)hideSideView{[UIView beginAnimations:nil context:nil];[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];if ( _centerController.view.frame.origin.x == 200) {[_centerController.view setFrame:CGRectMake(_centerController.view.frame.origin.x-200, _centerController.view.frame.origin.y, _centerController.view.frame.size.width, _centerController.view.frame.size.height)];}[UIView commitAnimations];// 最后调用防止出现白底[_leftController.view setHidden:YES];}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.}/*#pragma mark – Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {// Get the new view controller using [segue destinationViewController].// Pass the selected object to the new view controller.}*/@end在viewDidload方法里面，我们从storyboard中获取到两个ViewController，注意我的sideviewcontroller起的名字是LeftViewController，也就是在storyboard ID里面要写成这个名字。
然后添加进去了滑屏手势，分别是向左滑和向右滑
接下里在滑屏的代理里面定义了滑屏的动作。这里为什么要把显示/隐藏sideview单独做成两个method呢？因为一会我们要实现在mainVC里面点击头像的时候能够调用ContainerVC里的这两个函数！
接下来看看MainVC如何实现吧
MainViewController.h
但我自信，我能点亮心烛，化解心灵的困惑。
