zoukankan      html  css  js  c++  java
  • No view controller managing visible view

    UIPageViewController

     

    // Set visible view controllers, optionally with animation. Array should only include view controllers that will be visible after the animation has completed.

    // For transition style 'UIPageViewControllerTransitionStylePageCurl', if 'doubleSided' is 'YES' and the spine location is not 'UIPageViewControllerSpineLocationMid', two view controllers must be included, as the latter view controller is used as the back.

    - (void)setViewControllers:(nullable NSArray<UIViewController *> *)viewControllers direction:(UIPageViewControllerNavigationDirection)direction animated:(BOOL)animated completion:(void (^ __nullable)(BOOL finished))completion;

    https://forums.developer.apple.com/thread/6554

    First of all, setViewControllers:direction:animated:completion: is for you to set all the view controllers that will be visible after the animation has finished: sending that an array that consists solely of a freshly allocated UIPageViewController means that the original pageViewController object will just be showing a brand new UIPageViewController and no content view controllers, which I'm pretty sure is very bad and really not what you intended.

    The array should consist of whichever view controllers you want to be showing next.

    Secondly, is your UIPageViewController set with a page transition style of UIPageViewControllerTransitionStyleScroll?

    If so, there is indeed a bug in UIKit that sometimes causes this exception; I *think* it can be prevented by making sure you don't initiate a second call to setViewControllers:direction:animated:completion: until the first has completed, but I've yet to test the theory.

  • 相关阅读:
    eclispe安装tomcate没有srver解决
    反射常见方法
    让用户输入一个日期字符串,将其转换成日期格式, 格式是(yyyy/MM/dd,yyyyMMdd,yyyy-MM-dd)中的一种, 任何一种转换成功都可以; 如果所有的都无法转换,输出日期格式非法。
    List 接口中ArrayList Vector LinkedList 比较
    抽象类
    js核心知识
    JQgrid学习网站
    小练习---递归求5!
    map()
    小练习---阶乘
  • 原文地址:https://www.cnblogs.com/dengchaojie/p/8342269.html
Copyright © 2011-2022 走看看