包含UIPageViewController中嵌入的UITableViewController的我的应用程序不时会引发此异常:
Invalid parameter not satisfying: [views count] == 3
回溯:
* thread #1: tid = 0x6239fa, 0x03d1d88a libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread, stop reason = breakpoint 25.3
frame #0: 0x03d1d88a libobjc.A.dylib`objc_exception_throw
frame #1: 0x0404f448 CoreFoundation`+[NSException raise:format:arguments:] + 136
frame #2: 0x03428fee Foundation`-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
frame #3: 0x01e7c535 UIKit`-[_UIQueuingScrollView _replaceViews:updatingContents:adjustContentInsets:animated:] + 185
frame #4: 0x01e800ca UIKit`-[_UIQueuingScrollView _didScrollWithAnimation:force:] + 1231
frame #5: 0x01e7bb57 UIKit`-[_UIQueuingScrollView _scrollViewAnimationEnded:finished:] + 104
frame #6: 0x0190583c UIKit`-[UIScrollView(UIScrollViewInternal) animator:stopAnimation:fraction:] + 62
frame #7: 0x0197096e UIKit`-[UIAnimator stopAnimation:] + 533
frame #8: 0x0197100a UIKit`-[UIAnimator(Static) _advanceAnimationsOfType:withTimestamp:] + 325
frame #9: 0x01970b76 UIKit`-[UIAnimator(Static) _LCDHeartbeatCallback:] + 67
frame #10: 0x01663b8a QuartzCore`CA::Display::DisplayLinkItem::dispatch() + 48
frame #11: 0x01663a46 QuartzCore`CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 310
frame #12: 0x01663f6b QuartzCore`CA::Display::TimerDisplayLink::callback(__CFRunLoopTimer*, void*) + 123
frame #13: 0x0400dbd6 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
frame #14: 0x0400d5bd CoreFoundation`__CFRunLoopDoTimer + 1181
frame #15: 0x03ff5628 CoreFoundation`__CFRunLoopRun + 1816
frame #16: 0x03ff4ac3 CoreFoundation`CFRunLoopRunSpecific + 467
frame #17: 0x03ff48db CoreFoundation`CFRunLoopRunInMode + 123
frame #18: 0x0533b9e2 GraphicsServices`GSEventRunModal + 192
frame #19: 0x0533b809 GraphicsServices`GSEventRun + 104
frame #20: 0x01874d3b UIKit`UIApplicationMain + 1225
有没有人已经看过这个或者知道原因是什么?
答案 0 :(得分:44)
编辑:在使用此修复程序更长时间后,我仍然可以偶尔看到该错误,因此这不是完整的修复程序(嗯......它总是有点像黑客)。一旦我找到它,我会用实际的解决方案更新。
我使用UIPageViewController遇到了同样的错误。经过几个小时调试问题,我发现原因是在UIPageViewController的setViewControllers的完成处理程序中使用了UIView动画:direction:animated:completion:。
我不知道为什么在该阶段制作动画会导致断言错误(我没有动画UIPageViewController或其子视图控制器),但是在主队列中使用dispatch_async包装代码块解决了问题并停止了崩溃
答案 1 :(得分:7)
我尝试以编程方式过渡到新页面时看到此崩溃。对我来说有意义的答案是不允许他们在过渡期间触摸页面视图。
__block UIView *pageView = pageViewController.view;
// Disable page view to not allow the user to interrupt the page view animation and cause crash
pageView.userInteractionEnabled = NO;
[pageViewController setViewControllers:@[viewController] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished) {
if (finished) {
pageView.userInteractionEnabled = YES; // re-enable
}
}];
答案 2 :(得分:2)
请确保您在要返回的控制器中的viewDidAppear中没有进行任何动画操作。或者,如果在视图出现后你必须在延迟一段时间后再这样做。
答案 3 :(得分:2)
我使用带点的UIPageViewController。用户在点上滑动后,代表didFinishAnimating被调用,我触发其他动画,然后崩溃。但它只会在用户滑动点时发生。
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed
{
if (completed && finished)
{
dispatch_async(dispatch_get_main_queue(), ^{
[self animateSomeView];
})
}
}
答案 4 :(得分:0)
我在UIPageViewController中嵌入的UIViewController遇到了同样的错误。在我的情况下,我意识到我的孩子控制器已经覆盖viewWillAppear
和viewDidAppear
,而没有调用super
。虽然我只能猜测细节,但这样做有可能会破坏视图管理。添加super
来电会使问题消失。
答案 5 :(得分:0)
在我的案例中,问题在于UIPageViewControllerDelegate
:
我更新了约束
pageViewController(_ pageViewController:, didFinishAnimating:, previousViewControllers:, transitionCompleted:)
dispatch_async
解决了这个问题