viewWillAppear方法未调用iPhone SDK

Question

navigated from one view to another will and when i pop my view back viewWillAppear method is not calling.

can you please let me know the reason.

Answer 1

When you load View the first time viewWillAppear method is called? try to use

[[self navigationController] popViewControllerAnimated:TRUE];

to return back

Answer 2

If u are doing all well than ur application is crashed some where, use break point and check , even you can check and follow these steps......

step 1. for push in FirstViewController

SecondViewController *second = [[SecondViewController alloc]init]
[self.navigationController pushViewController:second animated:TRUE];

Step 2. for pop in SecondViewController

//check navigation controller exist in ur application stack

NSArray *arrView = [self.navigationController viewControllers];

NSLog(@"arrView %@",arrView);

for(int i = 0; i <[arrView count]-1, i++)
{
    if([arrView objectAtIndex:i] isKindOfClass:[FirstViewController class])
    {
        [self.navigationController popViewControllerAnimated:TRUE];
    }
} 

Answer 3

It's typical that these problems are caused by improper use of view controller containment. You need to look at your view controller hierarchy and research the following methods:

[UIViewController addChildViewController:];
[UIViewController removeFromParentViewController:];
[UIViewController transitionFromViewController:toViewController:duration:options:animations:completion:]
[UIViewController willMoveToParentViewController:]
[UIViewController didMoveToParentViewController:]

Read the Implementing a Container View Controller section of the UIViewController Class Reference.

Answer 4

I've also met this situation. In iOS 5, it's ok. But when I test in iOS 4.3.1, viewWillAppear is not calling.

So you need call viewWillAppear manually

You can try this

[[self.navigationController.viewControllers objectAtIndex:0] viewWillAppear:YES];
[self.navigationController popViewControllerAnimated:YES];