无法将操作添加到导航控制器iOS Xcode的后退按钮

Question

-(void)viewDidAppear:(BOOL)animated
{
    UIBarButtonItem *navigationBarbackButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(backToRootView:)];
    self.navigationItem.hidesBackButton = YES;
    self.navigationItem.backBarButtonItem = navigationBarbackButton;
}


-(void)backToRootView:(UIBarButtonItem *)sender
{

    [self.navigationController popToRootViewControllerAnimated:YES];
}

Answer 1

这里的矛盾之处在于，您backBarButtonItem动作事件设置为backBarButtonItem ，也将其设置为hidden 。 因此，目前尚不可见。

从viewDidAppear()方法中删除以下行：

self.navigationItem.hidesBackButton = YES;

调用super类方法作为视图生命周期方法也是一种很好的编程方法。

因此更新的方法将是：

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    UIBarButtonItem *navigationBarbackButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(backToRootView:)];
    self.navigationItem.backBarButtonItem = navigationBarbackButton;
}

编辑：

backBarButtonItem对弹出控制器具有默认操作，您无需为此添加操作事件。 我不确定您是否担心使用后退按钮，但是如果您尝试自定义左按钮项，则必须遵循以下代码：

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    UIBarButtonItem *navigationBarbackButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(backToRootView:)];
    self.navigationItem.leftBarButtonItem = navigationBarbackButton;
}


-(void)backToRootView:(UIBarButtonItem *)sender
{

    [self.navigationController popToRootViewControllerAnimated:YES];
}