ios - 在 UIPageViewController 中重新加载 View
<p><p>我正在制作一个具有 UIPageViewController 的 iOS 应用程序，如果尚未添加任何其他页面，则该 UIPageViewController 会加载默认页面，并且用户可以在通过应用程序进行时添加页面。但是，初始 View 不会随着其他 View 的添加而改变。</p>
<p>我尝试了以下问题的答案:<br/>
<a href="https://stackoverflow.com/questions/7208871/is-it-possible-to-turn-page-programmatically-in-uipageviewcontroller" rel="noreferrer noopener nofollow">Is it possible to Turn page programmatically in UIPageViewController?</a> <br/>
<a href="https://stackoverflow.com/questions/22554877/changing-uipageviewcontrollers-page-programmatically-doesnt-update-the-uipagec" rel="noreferrer noopener nofollow">Changing UIPageViewController's page programmatically doesn't update the UIPageControl</a> <br/>
<a href="https://stackoverflow.com/questions/14220289/removing-a-view-controller-from-uipageviewcontroller" rel="noreferrer noopener nofollow">Removing a view controller from UIPageViewController</a> <br/>
<a href="https://stackoverflow.com/questions/20120995/refresh-a-uipageviewcontroller" rel="noreferrer noopener nofollow">Refresh a UIPageViewController</a> </p>
<p>它们都不适合我。在我重新加载应用程序之前， View 仍保留在初始页面，之后页面显示正常，我可以添加任意数量的页面。</p>
<p>这是我用于制作 PageView 和页面的代码</p>
<pre><code>- (void)viewDidLoad
{
;
self.pageController = [ initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageController.dataSource = self;
[ setFrame:[ bounds]];
UIViewController *initialViewController = ;
__block Page1ViewController *blocksafeSelf = self;
// This doesn't work either... :(
void (^completionBlock)(BOOL) = ^(BOOL finished)
{
// It seems that whenever the setViewControllers:
// method is called with "animated" set to YES, UIPageViewController precaches
// the view controllers retrieved from it's data source meaning that
// the dismissed controller might not be removed. In such a case we
// have to force it to clear the cache by initiating a non-animated
// transition.
usleep(1);
dispatch_async(dispatch_get_main_queue(), ^(){
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
});
};
direction:UIPageViewControllerNavigationDirectionForward
animated:YES
completion:completionBlock];
;
[ addSubview:];
;
}
- (void)reloadViews
{
[ makeObjectsPerformSelector:@selector(removeFromParentViewController)];
[ makeObjectsPerformSelector:@selector(removeFromSuperview)];
;
;
;
self.pageController = nil;
self.pageController = [ init];
;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger index = ((SomethingViewController *)viewController).index;
index++;
if (index >= .count)
{
return nil;
}
return ;
}
- (UIViewController *)viewControllerAtIndex:(NSUInteger)index
{
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Storyboard_iPhone"
bundle:nil];
if (.count == 0 && index == 0)
{
NoSomethingViewController *vc = ;
vc.index = index;
return vc;
}
SomethingViewController *childViewController = ;
childViewController.something = [ somethingAtIndex:index];
childViewController.index = index;
return childViewController;
}
</code></pre>
<p>当应该创建一个新页面时，通过在 <code>somethings</code> 数组中添加一个 <code>something</code>，我从添加 <code> 的 ViewController 调用 reloadViews一些东西</code>。然后代码会到达 <code>viewControllerAtIndex</code> 的第二部分，但这并没有显示在我在手机上看到的页面上，因为我仍然看到 NoSomethingViewController 和它的 View 。</p>
<p>如果您需要更多代码，我会提供。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>在pageViewController viewWillAppear方法中添加如下代码</p>
<p>数据源 =self </p>
<p>并在 View 中添加WillDisappear</p>
<p>数据源 = 无</p>
<p>这将强制 pageViewController 重新加载其数据源</p></p>
<p style="font-size: 20px;">关于ios - 在 UIPageViewController 中重新加载 View ，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/24551073/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/24551073/
</a>
</p>
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