相关疑难解决方法(0)

我对以下实例所需的对象所有权模式有些不清楚.当我的UIViewController将弹出控制器,操作表或其他视图控制器呈现为模态时,我是否需要挂起对该子控制器的保留引用,直到它被解除为止？

换句话说,以下几行代码是否有效地"转移"了所有权？

[aPopoverController presentPopoverFromBarButtonItem:someButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:NO];

[anActionSheet showFromBarButtonItem:someButtonItem animated:NO];

[aViewController presentModalViewController:someOtherViewController animated:YES];

有人能指出我关于这个主题的明确文件吗？

-(void)showsearch:(id)sender
{
    SearchViewController *searchview =[[SearchViewController alloc] initWithNibName:@"SearchViewController" bundle:nil];

    settingpopoverController = [[[UIPopoverController alloc] 
                                    initWithContentViewController:searchview] autorelease];               
    [searchview release];
    [settingpopoverController presentPopoverFromBarButtonItem:sender 
                                    permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];


}

当我点击按钮时,应用程序崩溃了,我收到了[UIPopoverController dealloc] reached while popover is still visible.消息.