隐藏和取消隐藏工具栏时按钮项目丢失

Question

我不知道,为什么按钮在工具栏设置为隐藏和取消隐藏后消失.我该怎么办呢？

设置按钮代码

-(void)viewDidAppear:(BOOL)animated {
    //NSLog(@"viewDidAppear ");

    [self becomeFirstResponder];
    //Create a button
    UIBarButtonItem *back = [[UIBarButtonItem alloc] 
                        initWithBarButtonSystemItem:UIBarButtonSystemItemRewind 
                target:self action:@selector(goback:)];

    UIBarButtonItem *fixspace1 = [[UIBarButtonItem alloc] 
                                 initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
                                 target:self action:nil];

    UIBarButtonItem *next = [[UIBarButtonItem alloc] 
                             initWithBarButtonSystemItem:UIBarButtonSystemItemFastForward 
                             target:self action:@selector(gofwd:)];
    UIBarButtonItem *stop = [[UIBarButtonItem alloc] 
                             initWithBarButtonSystemItem:UIBarButtonSystemItemStop 
                             target:self action:@selector(stopload:)];

    UIBarButtonItem *refresh = [[UIBarButtonItem alloc] 
                             initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh 
                             target:self action:@selector(refreshWeb:)];


    [self.navigationController.toolbar setItems:[NSArray arrayWithObjects:fixspace1, back, fixspace1, stop, fixspace1, next, fixspace1, nil] animated:YES];
    [self.navigationItem setRightBarButtonItem:refresh animated:YES];

    [self.navigationController.view addSubview:self.navigationController.toolbar];

    [stop release];
    [next release];
    [back release];
    [refresh release];
    [fixspace1 release];
}

我用这种方法设置我的按钮

-(void)viewDidAppear:(BOOL)animated 

此代码用于隐藏工具栏

    [self.navigationController setNavigationBarHidden:YES animated:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
    [self.navigationController setToolbarHidden:YES animated:YES];

Answer 1

用于设置工具栏项的文档化方法是通过视图控制器的toolbarItems属性.在相同的UINavigationController参考也列出了toolbar为只读,并特别警告财产

您不应该直接修改UIToolbar对象.

因此,尝试改变

[self.navigationController.toolbar setItems:[NSArray arrayWithObjects:fixspace1, back, fixspace1, stop, fixspace1, next, fixspace1, nil] animated:YES];

至

[self setToolbarItems:[NSArray arrayWithObjects:fixspace1, back, fixspace1, stop, fixspace1, next, fixspace1, nil] animated:YES];