UIPageViewController VC重叠

Question

我遇到了一个奇怪的问题，而我UIViewControllers中的UIPageViewController宽度为 328 ，而不是 320 并且似乎正在流出他们的界限。

当查看说出页面索引0时，我可以在右侧看到一个或两个页面索引1。 为什么会这样？我正在使用AutoLayout并像这样创建我的UIPageViewController：

        self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:@{UIPageViewControllerOptionInterPageSpacingKey : [NSNumber numberWithFloat:pageSpacing]}];
        self.pageViewController.dataSource = self;
        self.pageViewController.delegate = self;
        [self.pageViewController willMoveToParentViewController:self];
        [self addChildViewController:self.pageViewController];
        [self.view addSubview:self.pageViewController.view];
        [self.pageViewController didMoveToParentViewController:self];


        /* remove dots */
        NSArray *subviews = self.pageViewController.view.subviews;
        UIPageControl *bottomControl = nil;
        for (int i=0; i<[subviews count]; i++) {
            if ([[subviews objectAtIndex:i] isKindOfClass:[UIPageControl class]]) {
                bottomControl = (UIPageControl *)[subviews objectAtIndex:i];
            }
        }
        bottomControl.hidden = true;

        /* set viewcontrollers */
        self.navViewControllers = @[
                                    leftViewController,
                                    centerViewController,
                                    rightViewController
                                    ];

        [self.pageViewController setViewControllers:@[self.navViewControllers[1]] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];