README.md

AboutMenu

左右菜单

演示：

具体步骤

1. //绑定具体的菜单

  #import "MenuViewController.h" （本类）
  #import "MenuCenterViewController.h"
  #import "MenuLeftViewController.h"
  #import "MenuRightViewController.h"
  
  //全局
  //缩放比例 
  static CGFloat scaleF = 0;
  //手势滑动的速度系数
  static CGFloat speedF = 0.5;
  
  
  
  self.leftView = [self.storyboard instantiateViewControllerWithIdentifier:@"MenuLeftViewController"];
  [self.view addSubview:self.leftView.view];
  
  self.rightView = [self.storyboard instantiateViewControllerWithIdentifier:@"MenuRightViewController"];
  [self.view addSubview:self.rightView.view];
  
  self.centerView = [self.storyboard instantiateViewControllerWithIdentifier:@"MenuCenterViewController"];
  [self.view addSubview:self.centerView.view];
  
2. //Pan 拖动手势
  UIPanGestureRecognizer *tp=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(dragGestureEvents:)];
  [self.centerView.view addGestureRecognizer:tp];
  
  //设置隐藏和显示
  self.leftView.view.hidden = YES;
  self.centerView.view.hidden = NO;
  self.rightView.view.hidden = YES;
  
3. 实现手势代码
 
  - (void)dragGestureEvents:(UIPanGestureRecognizer *)pan
  {
      //1.判断方向
      CGPoint point = [pan translationInView:self.view];
      
      scaleF = point.x + speedF + scaleF;
      
      if (pan.view.frame.origin.x >= 0) {
          //显示左面菜单
          //计算当前菜单的显示中心点位置
          CGFloat x = pan.view.center.x + point.x + speedF;
          pan.view.center = CGPointMake(x, pan.view.center.y);
          
          //计算缩放比例
          //得到一个滑动偏移量的百分比
          CGFloat sx = 1 - scaleF / 1000;
          CGFloat sy = 1 - scaleF / 1000;
          //CGAffineTransformScale 收缩
          //CGAffineTransformTranslate  平移
          pan.view.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, sx, sy);
          
          //还原手势
          [pan setTranslation:CGPointZero inView:self.view];
          
          //显示对应的菜单
          self.leftView.view.hidden = NO;
          self.rightView.view.hidden = YES;
          
      } else {
          //显示右面菜单
          //计算当前菜单的显示中心点位置
          CGFloat x = pan.view.center.x + point.x + speedF;
          pan.view.center = CGPointMake(x, pan.view.center.y);
          
          //计算缩放比例
          //得到一个滑动偏移量的百分比
          CGFloat sx = 1 + scaleF / 1000;
          CGFloat sy = 1 + scaleF / 1000;
          pan.view.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, sx, sy);
          
          //还原手势
          [pan setTranslation:CGPointZero inView:self.view];
          
          //显示对应的菜单
          self.leftView.view.hidden = YES;
          self.rightView.view.hidden = NO;
      }
      
      //手势结束
      if (pan.state == UIGestureRecognizerStateEnded) {
          //滑动偏移量
          //定义偏移量范围: 160
          CGFloat offsetX = speedF + 160;
          if (scaleF > offsetX) {
              //显示左边菜单
              [self showMenuLeftVC];
          } else  if (scaleF < -offsetX) {
              //显示右边菜单
              [self showMenuRightVC];
          } else {
              //显示主菜单
              [self showMenuCenterVC];
              //当我们手指离开屏幕的时候还原偏移量
              scaleF = 0;
          }
      }
  }


4.实现手势结束时菜单的显示方法
 
  //左面菜单显示
  - (void)showMenuLeftVC
  {
      //自定义组件中常用到
      [UIView beginAnimations:nil context:nil];
      
      self.centerView.view.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1, 1);
      
      self.centerView.view.center = CGPointMake(360, self.view.bounds.size.height/2);
      
      //执行动画
      [UIView commitAnimations];
  }
  
  //中间菜单显示
  - (void)showMenuCenterVC
  {
      //自定义组件中常用到
      [UIView beginAnimations:nil context:nil];
      
      self.centerView.view.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1, 1);
      
      self.centerView.view.center = CGPointMake(self.view.bounds.size.width/2, self.view.bounds.size.height/2);
      
      //执行动画
      [UIView commitAnimations];
  }
  
  //右面菜单显示
  - (void)showMenuRightVC
  {
      //自定义组件中常用到
      [UIView beginAnimations:nil context:nil];
      
      self.centerView.view.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1, 1);
      
      self.centerView.view.center = CGPointMake(0, self.view.bounds.size.height/2);
      
      //执行动画
      [UIView commitAnimations];
  }