Objective c 从HUD到Singleton

我想设置在Singleton中显示和取消HUD的方法。我用singleton编写此方法：

- (void)showHUD
{
    activityHud = [[MBProgressHUD alloc] init];
    activityHud.delegate = self;
}

---

但什么也没发生。对于解雇，我不知道如何写。。。任何答案都会很有帮助。谢谢

为什么不使用静态方法？我使用它并将其放在我的util类中

static UIWindow *window;  
+ (MBProgressHUD *)showGlobalProgressHUDWithTitle:(NSString *)title {
window = [[[UIApplication sharedApplication] windows] lastObject];
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:window animated:YES];
hud.labelText = title;

return hud;

}

用这个来隐藏它：

+ (void)dismissGlobalHUD {

[MBProgressHUD hideHUDForView:window animated:YES]; 
}

---

你可以做我做的事。我有一个基本VC类，我的所有viewControllers子类都来自该类，并有以下方法：

-(void)showActivityViewForView:(UIView *)view withActivityText:(NSString *)text;

及

实施如下：

    -(void)showActivityViewForView:(UIView *)view withActivityText:(NSString *)text;
{
    self.viewForActivity = view;
    self.activitytext = text;
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(showActivityView) userInfo:nil repeats:NO];
}


-(void)showActivityView
{
    self.progressView = [MBProgressHUD showHUDAddedTo:self.viewForActivity animated:YES];
    self.progressView.opacity = 0.5;
    self.progressView.labelText = self.activitytext;
}

-(void)hideActivityView
{
    [self.timer invalidate];
    [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}

计时器在那里，因此如果我完成的网络活动不到一秒钟，我根本不显示

MBProgressHUD

---

将它放在基类中意味着我所有的VC都可以轻松访问这些方法

这看起来一点也不像单例模式。因为这是单例模式中唯一的方法，所以在这里不需要使用此方法复制/粘贴整个单例模式……您正在实例化一个对象并设置其委托属性。显示它的代码在哪里？

    -(void)showActivityViewForView:(UIView *)view withActivityText:(NSString *)text;
{
    self.viewForActivity = view;
    self.activitytext = text;
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(showActivityView) userInfo:nil repeats:NO];
}


-(void)showActivityView
{
    self.progressView = [MBProgressHUD showHUDAddedTo:self.viewForActivity animated:YES];
    self.progressView.opacity = 0.5;
    self.progressView.labelText = self.activitytext;
}

-(void)hideActivityView
{
    [self.timer invalidate];
    [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}