path效果

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch=[touches anyObject];

    touchBeganPoint = [touch locationInView:[[UIApplication sharedApplication] keyWindow]];

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch = [touches anyObject];

    CGPoint touchPoint = [touch locationInView:[[UIApplication sharedApplication] keyWindow]];

    

    CGFloat xOffSet = touchPoint.x - touchBeganPoint.x;

    

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    if (xOffSet < 0) {

        [appDelegate makeRightViewVisible];

    }

    else if (xOffSet > 0) {

        [appDelegate makeLeftViewVisible];

    }

    

    self.navigationController.view.frame = CGRectMake(xOffSet, 

                                                      self.navigationController.view.frame.origin.y, 

                                                      self.navigationController.view.frame.size.width, 

                                                      self.navigationController.view.frame.size.height);

}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    // animate to left side

    if (self.navigationController.view.frame.origin.x < -kTriggerOffSet) 

        [self moveToLeftSide];

    // animate to right side

    else if (self.navigationController.view.frame.origin.x > kTriggerOffSet) 

        [self moveToRightSide];

    // reset

    else 

        [self restoreViewLocation];

}