Question

单击按钮时，会出现NavigationView中嵌入的popoverView。我的代码如下：

  -(IBAction)myStuffPOP:(id)sender
   {
    if(myStuffListViewController ==nil)
    {        
        myStuffListViewController = [[MyStuffListViewController alloc] init]; 
    }
    UINavigationController *navcontroller=[[[UINavigationController alloc] initWithRootViewController:myStuffListViewController] autorelease];
 // Here we create popover controller.
    mystuffPopoverView =  [[UIPopoverController alloc] initWithContentViewController:navcontroller] ;
    CGRect popoverRect = [self.view convertRect:[sender frame] fromView:[sender superview]];

    popoverRect.size.width = MIN(popoverRect.size.width, 100);
    popoverRect.size.height = 40;

    [mystuffPopoverView presentPopoverFromRect:popoverRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

    [navcontroller setNavigationBarHidden:NO];

}

在PopoverView的NavigationView中：

1st subView ---> 2nd SubView ---> 3rd Subview

如果我触摸3rd SubView，PopoverView就会消失。

我的问题是：

当我再次点击按钮时，我想看到最新的视图 - 3rd SubView not 1st SubView.

Answer 1

无需每次都创建UINavigationController。保存方式与MyStuffListViewController

相同

if ( myNavigationController == nil )
    myNavigationController = [[[UINavigationController alloc]     initWithRootViewController:myStuffListViewController] autorelease];

Answer 2

在.h文件中声明UINavigationController *navcontroller;

仅使用根视图控制器创建on navcontroller，例如，在viewDidLoad方法中。

- (void)viewDidLoad {     
    myStuffListViewController = [[MyStuffListViewController alloc] init]; 
    navcontroller=[[UINavigationController alloc] initWithRootViewController:myStuffListViewController]; }

使用现有导航堆栈显示UIPopoverController

-(IBAction)myStuffPOP:(id)sender    {
    //Here we create popover controller.
    mystuffPopoverView =  [[UIPopoverController alloc] initWithContentViewController:navcontroller] ;
    CGRect popoverRect = [self.view convertRect:[sender frame] fromView:[sender superview]];

    popoverRect.size.width = MIN(popoverRect.size.width, 100);
    popoverRect.size.height = 40;

    [mystuffPopoverView presentPopoverFromRect:popoverRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp
animated:YES];
    [navcontroller setNavigationBarHidden:NO]; }

不要忘记release个对象

- (void)dealloc {   
    [myStuffListViewController release];
    [navcontroller release];
}

单击NavigationView中嵌入的弹出框后，如何查看最新的子视图？

2 个答案: