显示/隐藏 SearchBar 后后退按钮图像未显示答案

【问题标题】：Back Button image not showing up after showing/hiding SearchBar显示/隐藏 SearchBar 后后退按钮图像未显示
【发布时间】：2015-07-23 03:04:50
【问题描述】：

我的 NavigationBar 中有一个 SearchBar。单击 SearchBar 时，我将其显示在导航栏上的“返回”按钮上。但是，当我重新显示“返回”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

关于为什么会发生这种情况的任何想法？谢谢！

【问题讨论】：

我想知道，取出这两行：self.navigationItem.hidesBackButton = NO / YES; 仍然移动/隐藏箭头吗？
@theMonster 不，箭头仍然存在。但是，SearchBar 没有延伸到导航栏的全长（这是我需要的）
你试过用[self.navigationItem setHidesBackButton:YES / NO animated:YES];代替吗？

标签： ios iphone uinavigationbar searchbar

【解决方案1】：

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

self.navigationItem.leftBarButtonItem = nil;

【讨论】：

啊，非常感谢！我尝试了很多不同的变化，不知道我是怎么错过的。感谢您的快速帮助。将在 2 分钟内接受
@user1282637 很高兴为您提供帮助。

【解决方案2】：

*- (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.leftBarButtonItem = nil;
    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;
}*

【讨论】：