我怎么知道iPhone中的当前ViewController名称 [英] how can I know current viewcontroller name in iphone

问题描述

我有实现UIViewController的BaseView.项目中的每个视图都必须实现此BaseView.

I have BaseView which implement UIViewController. Every view in project must implement this BaseView.

在BaseView中，我有方法:

In BaseView, I have method:

-(void) checkLoginStatus
{
    defaults = [[NSUserDefaults alloc] init];

    if(![[defaults objectForKey:@"USERID"] length] > 0 )
    {
        Login *login=[[Login alloc] initWithNibName:@"Login" bundle:nil];
        [self.navigationController pushViewController:login animated:TRUE];
        [login release];
    }
    [defaults release];
}

问题是我的登录视图也实现了BaseView，检查登录，然后再次打开LoginView，即卡在递归调用中.

The problem is my Login view also implement BaseView, checks for login, and again open LoginView i.e. stuck in to recursive calling.

如果请求来自LoginView，是否可以签入checkLoginStatus方法，然后不执行其他任何操作，否则请检查登录名.例如:

Can I check in checkLoginStatus method if request is from LoginView then take no action else check login. Ex:

- (void) checkLoginStatus
{
    **if(SubView is NOT Login){** 
        defaults = [[NSUserDefaults alloc] init];

        if(![[defaults objectForKey:@"USERID"] length] > 0 )
        {
            Login *login=[[Login alloc] initWithNibName:@"Login" bundle:nil];
            [self.navigationController pushViewController:login animated:TRUE];
            [login release];
        }
        [defaults release];
    }
}

请帮助.

推荐答案

使用以下方法:

if ([self isMemberOfClass:[Login class]])
{
    CFShow(@"Yep, it's the login controller");
}

isMemberOfClass 告诉您该实例是否是该类的确切实例.还有 isKindOfClass :

isMemberOfClass tells you if the instance is an exact instance of that class. There's also isKindOfClass:

if ([self isKindOfClass:[BaseView class]])
{
    CFShow(@"This will log for all classes that extend BaseView");
}

isKind测试该类是某个类的扩展.

isKind tests that the class is a extension of a certain class.

因此，以您的示例为例:

So given your example:

-(void) checkLoginStatus
{
    defaults = [[NSUserDefaults alloc] init];

    if (![self isMemberOfClass:[Login class]])
    {
        if (![[defaults objectForKey:@"USERID"] length] > 0 )
        {
            Login *login=[[Login alloc] initWithNibName:@"Login" bundle:nil];
            [self.navigationController pushViewController:login animated:TRUE];
            [login release];
        }
    }
    [defaults release];
}

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