R – viewDidAppear: not firing under certain conditions

cocoa-touchiphoneuiviewcontroller

I have the following items in my app nib:

the usual: file's owner, first responder window, delegate
View Controller "a"
- View "b"
  - UIScrollView "c"
  - some other stuff in "b"

In my AppDelegate applicationDidFinishLaunching, I do this:

[window makeKeyAndVisible]
[window addSubView:a.view];
create a view controller "d"
create a navigationController "e" with rootviewcontroller "d"
invoke [c addSubView:e.view]

Question/problem: when I do all of the above, viewDidAppear: is not firing for "d". (but viewDidLoad IS firing.) How do I find out why it is not firing, and fix it so that it would fire?

(Why I want to use viewDidAppear: the above involves some chained animations and viewDidAppear looks like a good place for a view controller to know when its view has been loaded and animated, so it can trigger subsequent animations.)

Best Answer

Usually when you're manually screwing with the view hierarchy you won't get -viewWillAppear:, -viewDidAppear, etc.; they're called by various SDK methods, like -pushViewController:animated:, -presentModalViewController:animated:, and by UITabBarController when a tab gets selected.

When you add a view to the hierarchy yourself, it may or may not be onscreen or going-to-be-onscreen; the -addSubview: method doesn't make any assumptions about your intentions. Just call 'em yourself as you add the view.

Related Solutions

Iphone – Creating a nib file for a Table View Controller

Create a TableViewController in Xcode.
Create an empty nib file in Interface Builder.
Set the File's Owner Class property to the TableViewController from step 1.
Add a TableView to the empty nib file.
Set the File's Owner view property to the TableView from step 4.
Customize the TableView in IB as you want.
Override the initWithNibName:bundle: method in Xcode for the TableViewController you created and use code similar to the following:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:@"MyNibName" bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}

R – Toolbar items in sub-nib

First off, the way you've worded your question is a bit confusing here, but I think I understand.

You've got a couple options here. If you want to design your toolbar, just add one to the view you are loading and drag the various buttons and separators onto it in Interface Builder. Then create IBActions in that view's view controller and drag connections from your toolbar items to the various actions. Since you are using a Navigation controller, though, you will want to hide the toolbar you get by default by unchecking the "Shows Toolbar" box in your MainWindow.xib when the UINavigationController is selected (Attributes tab in the IB inspector).

alt text http://cimgf.com/files/toolbarthing.png

Alternatively, you can just add toolbar items programmatically in the viewDidLoad method by calling [self setToolbarItems:items]; where items is an NSArray of toolbar items.

Really there is no way that I'm aware of to cause the navigation controller to use your custom toolbar. Just hide the main one and use your custom one.

Best Answer

Related Solutions

Iphone – Creating a nib file for a Table View Controller

R – Toolbar items in sub-nib

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