小编Bil*_*oto的帖子

我在与UISearchController关联的UINavigationItem的titleView中有一个UISearchBar.当我向后导航时,它似乎闪烁.有人见过这个吗？

闪电的视频

@interface HNTileSearchViewController () <HNTileSearchResultsProtocol, SWRevealViewControllerDelegate, UISearchBarDelegate, HNSetSearchFiltersProtocol, HNKeywordResultsProtocol>
...
@property (nonatomic, strong) UISearchController *searchController;
@property (nonatomic, strong) UISearchBar * searchBarTop;
...
@end


@implementation HNTileSearchViewController
...
    - (void) customPreSetup {
        HNKeywordResultsTableViewController * searchResultsController = [self.storyboard instantiateViewControllerWithIdentifier:HNKeywordResultsTableViewControllerStoryboardIdentifier];
        searchResultsController.delegate = self;
        _searchController = [[UISearchController alloc] initWithSearchResultsController:searchResultsController];
        _searchController.searchResultsUpdater = searchResultsController;
        _searchController.hidesNavigationBarDuringPresentation = NO;
        _searchController.dimsBackgroundDuringPresentation = NO;
        _searchBarTop = _searchController.searchBar;
        _searchBarTop.delegate = self;
        _searchBarTop.placeholder = NSLocalizedString(@"Search heynay", nil);
        _searchBarTop.showsCancelButton = NO;
        _searchBarTop.showsScopeBar = NO;
        self.navigationItem.titleView = _searchBarTop;
        self.definesPresentationContext = YES;
    }

    - (void) …

之前曾问过这个问题,但最初的提问者不需要改变动态属性,所以他通过取消它来回答他自己的问题.

我在iOS7中使用Sprite Kit,我希望能够在运行时更改SKPhysicsBody的动态属性.最初我正在改变我的touchesBegan:方法.Apple Dev论坛中有人建议将更改移至didSimulatePhysics:方法,但这也无济于事.

此代码导致错误:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
  if (!heyWereSwappingDynamismHere) 
  {
    heyWereSwappingDynamismHere = YES;
    SKNode * rope = [self childNodeWithName:@"rope"];
    SKNode * anchor = [rope childNodeWithName:@"anchor"];
    [listOfObjectsToSwapDynamic addObject:anchor];
  }
}

-(void) didSimulatePhysics 
{
  if (heyWereSwappingDynamismHere) 
  {
    for (SKNode * node in listOfObjectsToSwapDynamic) 
    {
        bool isItDynamic = node.physicsBody.isDynamic;
        node.physicsBody.dynamic = !isItDynamic;
    }
    [listOfObjectsToSwapDynamic removeAllObjects];
    heyWereSwappingDynamismHere = NO;
}

}

调试器中出现的错误是:

断言失败:(的typeA == b2_dynamicBody || TYPEB == b2_dynamicBody),功能SolveTOI,文件/SourceCache/PhysicsKit/PhysicsKit-4.6/PhysicsKit/Box2D/Dynamics/b2World.cpp,670路.

我在其他地方环顾四周,但这似乎是Sprite Kit实现(并覆盖)Box2D的一个问题.

也许？