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  • UIPageViewController跳跃切换的问题

    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
    
    });
    
    }
    
    }];
    
    }
    
    }
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  • 原文地址:https://www.cnblogs.com/Free-Thinker/p/5075225.html
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