ios – 显示/隐藏SearchBar后不显示后退按钮图像

2023年11月14日 268次阅读

我的NavigationBar中有一个SearchBar.单击SearchBar时,我将其显示在导航栏上的“后退”按钮上.但是,当我重新显示“后退”按钮时,它旁边的箭头不再可见.这就是我的意思：

这是我的代码：

#import "SearchViewController.h"

@interface SearchViewController ()

@end

- (void)viewDidLoad {
    [super viewDidLoad];
    if ([self respondsToSelector:@selector(edgesForExtendedLayout)])
        self.edgesForExtendedLayout = UIRectEdgeNone;

    UISearchBar *searchBar = [UISearchBar new];
    searchBar.showsCancelButton = NO;
    [searchBar sizeToFit];
    searchBar.delegate = self;

    self.navigationItem.titleView = searchBar;
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:nil];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
[searchBar setShowsCancelButton:YES animated:YES];
    self.navigationItem.hidesBackButton = YES;
    self.navigationItem.titleView = searchBar;
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:nil];
}

- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
    [searchBar setShowsCancelButton:NO animated:YES];
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
    [searchBar resignFirstResponder];
    [searchBar setShowsCancelButton:NO animated:YES];

    self.navigationItem.titleView = searchBar;
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:nil];
    self.navigationItem.hidesBackButton = NO;
}

@end

有关为什么会发生这种情况的任何想法？谢谢！

最佳答案 只需将此行添加到方法searchBarCancelButtonClicked：searchBar：

self.navigationItem.leftBarButtonItem = nil;
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