iOS模仿QQ侧边栏的实现方法实例

 [self addChildViewController:self.leftVc];
 [self addChildViewController:self.mainVc];  
 [self.mainVc didMoveToParentViewController:self];  
 [self.leftVc didMoveToParentViewController:self];
//添加屏幕边缘平移手势
 [self.mainVc.view addGestureRecognizer:self.pan1];  
 //添加平移手势
 [self.mainVc.view addGestureRecognizer:self.pan2];  
 //添加点击手势
 [self.mainVc.view addGestureRecognizer:self.tap];

#pragma mark---手势处理
-(void)screenGesture:(UIPanGestureRecognizer *)pan{
 //移动的距离
 CGPoint point = [pan translationInView:pan.view];
 //移动的速度
 CGPoint verPoint = [pan velocityInView:pan.view];
 self.mainVc.view.lx_x += point.x;
 //边界限定
 if (self.mainVc.view.lx_x >= MAXLEFTSLIDEWIDTH) {
  self.mainVc.view.lx_x = MAXLEFTSLIDEWIDTH;
 }
 if (self.mainVc.view.lx_x <= 0) {
  self.mainVc.view.lx_x = 0;
 }
 //蒙版的阴影限定
 self.maskView.alpha = self.mainVc.view.lx_x /MAXLEFTSLIDEWIDTH;
 if (pan.state == UIGestureRecognizerStateEnded) {
  //判断手势
  if (pan == self.pan1) {
   if (verPoint.x > MAXSPEED) {
     [self showLeftVc];
   }else{
    if (self.mainVc.view.lx_x >= Device_Width/2) {
     [self showLeftVc];
      
    }else{
      
     [self hideLeftVc]; 
    }
   }
  }else{
   if (verPoint.x < - MAXSPEED) {
     
    [self hideLeftVc];
   }else{
    if (self.mainVc.view.lx_x >= Device_Width/2) {     
     [self showLeftVc];
      
    }else{
      
     [self hideLeftVc];     
    }
   }
  }     
 }  
 [pan setTranslation:CGPointZero inView:pan.view];
}

- (void)viewDidLoad {
 [super viewDidLoad];
 // Do any additional setup after loading the view.
 self.navigationBar.translucent = YES;
 self.navigationBar.barTintColor = LXMainColor;
 self.interactivePopGestureRecognizer.delegate = self;
}
#pragma mark--防止与添加到tabbar的手势冲突--
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
 if (self.childViewControllers.count <= 1) {
  return NO;
 }
 return YES;
}