iPhone在故事板中呈现和解散导航视图控制器？

Question

我有根视图,它提供了带有内容控制器的导航控制器,它的外观如下:

NavigationController以模态方式呈现,ProjectTypeSelectionView是其根控制器.当点击注销按钮时,我想解除模态视图并返回到LoginScreenViewController.

所以我在prepareSegue LoginScreen中设置为委托:

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

 UINavigationController *destination = segue.destinationViewController;

 if ([[destination ] respondsToSelector:@selector(setDelegate:)]) {
     NSLog(@"%@", destination);
     [destination setValue:self forKey:@"delegate"];
}
}

然后在ProjectTypeViewController中添加此方法:

 - (IBAction)logout:(id)sender {
      [self.delegate projectTypeSelectionViewControllerDidFinish];
 }

点击注销按钮时调用.令我惊讶的是,这并没有解雇控制器.没有任何事情发生,即使你的一切都是连通的.

我已经跟踪了错误 - 当prepareSegue被调用时,NavigationController的delagate被设置为LoginScreenViewController,将ProjectTypeController的委托设置为LoginScreenViewController的插件.

我该如何正确解决这个问题？

Answer 1

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

 UINavigationController *destination = segue.destinationViewController;
UIViewController *vc = [[destination viewControllers] objectAtIndex:0];
vc.delegate = self;
}

为了使这段代码更加健壮,您可能需要检查desitinationViewController是否是UINavigationController