UIPageViewController跳跃切换的问题 - 静如树

使用的是XHScrollMenu和UIPageViewController来构建5个页面:

ViewController1, ViewController2, ViewController3, ViewController4, ViewController5。

XHScrollMenu和UIPageViewController左右滑动均可以控制页面的切换。

一般情况下是正确的。

但如果点击了menu，切换ViewController1，然后再点击menu直接切换至ViewController5。

从ViewController5向右滑动往回切换的时候发现始终会直接切换至ViewController1，而不是ViewController4。

我用一个int变量来标识当前的页面，以此作为跳转的依据，但不起作用，原因是UIPageViewController调用Delegate的时候自动使用了ViewController1。

这可能是UIPageViewController的Bug，或者是一种缓存机制。

它的特点如下:

1.

self . pageViewController = [[ UIPageViewController alloc ] initWithTransitionStyle : UIPageViewControllerTransitionStyleScroll navigationOrientation :UIPageViewControllerNavigationOrientationHorizontal options : nil ];

2.使用menu来控制切换的代码如下

- ( void)scrollMenuDidSelected:( XHScrollMenu *)scrollMenu menuIndex:( NSUInteger)selectIndex {

[_ pageViewController setViewControllers :[ NSArray arrayWithObject :[self  viewControllerAtIndex :selectIndex]] direction :UIPageViewControllerNavigationDirectionForward animated : YES completion : NULL ]

}

最后修改:

- ( void)scrollMenuDidSelected:( XHScrollMenu *)scrollMenu menuIndex:( NSUInteger)selectIndex {

if (selectIndex > _pageIndex) { //前翻或者后翻的条件判断

__block XX ViewController *blocksafeSelf = self;

[ self . pageViewController setViewControllers :[ NSArray arrayWithObject :[ self viewControllerAtIndex :selectIndex]] direction :UIPageViewControllerNavigationDirectionForward animated : YES completion :^( BOOL finished) {

if (finished) {

dispatch_async( dispatch_get_main_queue(), ^{

[blocksafeSelf. pageViewController setViewControllers :[ NSArray arrayWithObject :[blocksafeSelf viewControllerAtIndex :selectIndex]] direction :UIPageViewControllerNavigationDirectionForward animated : NO completion : NULL ]; // bug fix for uipageview controller

});

}

}];

} else {

__block RCOnlineViewController *blocksafeSelf = self;

[ self . pageViewController setViewControllers :[ NSArray arrayWithObject :[ self viewControllerAtIndex :selectIndex]] direction :UIPageViewControllerNavigationDirectionReverse animated : YES completion :^( BOOL finished){

if (finished) {

dispatch_async( dispatch_get_main_queue(), ^{

[blocksafeSelf. pageViewController setViewControllers :[ NSArray arrayWithObject :[blocksafeSelf viewControllerAtIndex :selectIndex]] direction :UIPageViewControllerNavigationDirectionReverse animated : NO completion : NULL ]; // bug fix for uipageview controller

});

}

}];

}

}