objective-c - 为什么 UISearchBar 在向后导航时出现奇怪的闪烁？

Question

我的 UINavigationItem 的 titleView 中有一个 UISearchBar 与 UISearchController 关联。当我向后导航时，它似乎在闪烁。有人以前见过这个吗？

vid of flash

@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) viewDidLoad {
        [super viewDidLoad];
        [self customPreSetup];
        ...
    }
....
@end

Answer 1

我遇到了同样的问题，我用两种方法解决了:

首先，您可以将 searchStyle 设置为 Prominent:

searchController.searchBar.searchBarStyle = .Prominent

顺便说一句，我是用 Swift 写的，这个解决方案的问题是搜索图标和文本以及占位符的颜色较深，如果背景颜色较深，则看起来很糟糕。

我找到的第二个解决方案是:

 navigationController!.navigationBar.translucent=false
 navigationController!.navigationBar.barTintColor=UIColor.redColor()

 searchController.searchBar.barTintColor=UIColor.redColor()
 searchController.searchBar.searchBarStyle = .Prominent
 searchController.searchBar.translucent=false

关键是导航栏和搜索栏都不是半透明的，并且都具有相同的颜色。

希望对你有帮助