Question

所以，让我说我在viewcontroller，C，我想转换到viewcontroller D（这里是voteView）。所以这就是我所做的：

VoteViewController * voteView = [[VoteViewController alloc] init];
        voteView.voteInfo = [array objectAtIndex:0];

    NSArray * viewControllers = [self.navigationController viewControllers];
    if ([[viewControllers objectAtIndex:0] isKindOfClass:[ListViewController class]]){
        NSLog(@"LIST VIEW");
    } else if ([[viewControllers objectAtIndex:0] isKindOfClass:[SpotListingViewController class]]){
        NSLog(@"SPOT LISTING");
    }

    [self.navigationController setViewControllers:[NSArray arrayWithObjects:[viewControllers objectAtIndex:0], [viewControllers objectAtIndex:1], voteView, nil]];
    [voteView release];

运行上面的代码，它打印LIST VIEW，这意味着RootViewController是一个ListViewController。现在我在VoteViewController上进行了如下操作：

 if ([[viewControllers objectAtIndex:0] isKindOfClass:[ListViewController class]]){
            NSLog(@"LIST VIEW");

它应该打印LIST VIEW，但它不会。为什么是这样？我还检查了视图控制器的计数，它只有2.为什么它不同？

Answer 1

如果您要求转换到View Controller D（或voteView），那么您应该这样做 -

[self.navigationController pushViewController:voteView animated:YES];

与您的问题相关，当您在索引1处调用setViewControllers:并访问对象时，您是否确保该数组有两个对象？您使用voteView的哪种方法NSLog？

使用popToRootViewController的UINavigationController问题

1 个答案: