Question

所以我的导航控制器中有一个设置栏按钮项，当从家庭视图控制器按下时，会在家庭视图上打开设置vc透明视图，因此家庭vc仍然可以在设置vc后面看到。我希望导航栏仍然显示，所以在“HomeViewController.h”中我有以下代码：

-(IBAction)settingsButtonPressed:(id)sender{
    SettingsViewController *settings = [[SettingsViewController alloc]init];
    [self.navigationController.view addSubview:settings.view];
}

当我想删除设置视图时，在“SettingsViewController”中我尝试了：

-(IBAction)exitSettings:(id)sender{
    [self.navigationController.view removeFromSuperview];
}

但是当我这样做并尝试运行程序时，程序停止，在调试区域，它只是说

Thread 1: EXC_BAD_ACCESS (code = 2, address=0xb0000008)
(lldb)

我做错了什么，如何解决这个问题？

Answer 1

由于此代码发生了崩溃：

[self.navigationController.view removeFromSuperview];

您正尝试删除navigationController视图而非设置视图。

当您添加SettingsViewController添加tag时：

-(IBAction)settingsButtonPressed:(id)sender
{
    SettingsViewController *settings = [[SettingsViewController alloc]init];
    settings.view.tag = 7;
    [self.navigationController.view addSubview:settings.view];
}

并使用此tag从navigationcontroller中删除视图：

-(IBAction)exitSettings:(id)sender
{
    [[self.navigationController.view viewWithTag:7] removeFromSuperview];
}

Answer 2

for (UIView *view in self.navigationController.view.subviews)
{
    if ([view isKindOfClass:[SettingsViewController class]])
    {
        [view removeFromSuperview];
    }
}

Answer 3

-(IBAction)exitSettings:(id)sender
{
      [vc dismissModalViewControllerAnimated:YES];
}

vc是您的ViewController对象。

尝试这个。

如何删除我添加到navigationcontroller视图的视图？

3 个答案: