Question

我有三个控制器，我想知道控制器是推或弹

控制器：

{
    if(!b)
     b = [B alloc] init];
    [self.navigationController pushViewController:b animated:YES];
}

B控制器：

- (void) viewDidAppear:(BOOL)animated 
{
     [super viewDidAppear:animated];
     //I want here to judge, from the "A" push over, or to return from the "C" "pop"

     //if it is push from A 
     //dosomething.....


     //if it is pop from C
     //dosomething
}
-(void)testAction:(id)sender
{
    C *c = [[C alloc] init];
    [self.navigationController pushViewController:b animated:YES];
    [c release];
}

C控制器：

{
    [self.navigationController popViewControllerAnimated:YES];
}

感谢。

Answer 1

看看UIViewController方法，isMovingToParentViewController。如果视图控制器因为被按下而显示，则返回YES，如果因为另一个视图控制器从堆栈中弹出而显示，则返回NO。

-(void)viewDidAppear:(BOOL)animated { //Code in view controller B
    [super viewDidAppear:animated];
    NSLog(@"isMovingToParentViewController: %d",self.isMovingToParentViewController);
    // this will log 1 if pushing from A but 0 if C is popped
}

Answer 2

编辑：

Add UINavigationControllerDelegate in .h file

也这样做：

[self.yournavController setDelegate:self];

以下方法为navigation controller delegate，当导航控制器shows通过top view controller，push或pop获得新setting时，会调用此方法view controller stack。

添加此方法

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{

}

Answer 3

嗯，我认为你需要跟踪一个全局变量，它知道它是从A推出还是从C弹出。我要做的是：

在appDelegate或某个外部.h文件中声明BOOL变量isPush并合成它。
当你从A到B，即它是一个推动，使它相等＆＃34;是＆＃34;在A。

yourAppDelegate *myDelegate = (yourAppDelegate*) [[UIApplication SharedApplication] delegate];

myDelegate.isPush = YES;

同样在从C弹出之前，设为isPush = NO;

在B＆＃39; viewDidLoad中，查看变量的值。

yourAppDelegate *myDelegate = (yourAppDelegate*) [[UIApplication SharedApplication] delegate];

if(myDelegate.isPush)
//means A was pushed

else
//means C was popped

ios我怎么知道控制器返回“推”或“弹出”

3 个答案: