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我有一个应用程序，其中我有一个视图控制器，它是一个 appdelegate 实例。我将该视图添加到 self.navigationcontrollers 视图中，以便将其放在导航栏上方。lke this `

if(appDelegate.viewcontroller==nil)
    {

        appDelegate.viewcontroller = [[ViewController alloc] init];
        [self.navigationController.view addSubview:appDelegate.viewcontroller.view];
        NSLog(@"My view frame: %@", NSStringFromCGRect(appDelegate.viewcontroller.view.frame));

        appDelegate.viewcontroller.view.tag=7;


        appDelegate.viewcontroller.view.frame =CGRectMake(0,480,300,460);
        [UIView animateWithDuration:.50 
                         animations:^{
       appDelegate.viewcontroller.view.frame =CGRectMake(0,30,300,440);
                         }];
        [appDelegate.viewcontroller viewWillAppear:YES];

    }
    else
    { 
        NSLog(@"My view frame: %@", NSStringFromCGRect(appDelegate.viewcontroller.view.frame));
        appDelegate.viewcontroller.view.frame=CGRectMake(0, 30,300, 440); 



        [self.navigationController.view addSubview:appDelegate.viewcontroller.view];


        appDelegate.viewcontroller.view.frame =CGRectMake(0,480,300,460);
        [UIView animateWithDuration:.50 
                         animations:^{
                             appDelegate.viewcontroller.view.frame =CGRectMake(0,30,300,440);
                         }];
       [appDelegate.viewcontroller viewWillAppear:YES];

    }

...Now i am adding another viewcontrollers view in to this view by

contactphoneForAddfriend= [[EventsViewController alloc]initWithNibName:@"EventsViewController" bundle:nil];
    contactphoneForAddfriend.orgarray=self.eventsArray;


    [UIView beginAnimations:@"View Flip" context:nil];
    [UIView setAnimationDuration:0.80];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

    [UIView setAnimationTransition:
     UIViewAnimationTransitionFlipFromRight
                           forView:self.view cache:NO];


     [self.view addSubview:contactphoneForAddfriend.view];
    [UIView commitAnimations];

` 然后当我进入应用程序的后台时，从那个视图控制器...appdelegate viewcontroller 显示为nil。这是怎么发生的。毕竟它是一个appdelegate variouble。当我删除他添加视图然后去背景就在那里。有人能指出我哪里出错了吗？

4

1 回答 1

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检查你的代码。发现 viewController 不是 nil。通过在这个方法中应用一些代码来检查自己

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    if (self.viewController==nil) {
        NSLog(@"ViewController is nil");
    }else{
        NSLog(@"ViewController Has value %@",NSStringFromClass([self.viewController class]));
    }
}
于 2013-07-10T07:39:29.677 回答