ios 如何知道 Controller 返回的是 "push"还是 "pop"

Question

我有三个 Controller ，我想知道 Controller 是推送还是弹出

Controller :

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

B Controller :

- (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 Controller :

{
    [self.navigationController popViewControllerAnimated:YES];
}

谢谢。

Answer 1

看一下 UIViewController 方法，isMovingToParentViewController。如果 View Controller 因为被推送而被显示，这将返回 YES，但如果因为另一个 View Controller 从堆栈中弹出而显示它，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
}