Xibs and Scrollview - ios

Question

I'm still pretty new at this, so bear with me. I thought I would be able to load a Xib in a ScrollView, as I have seen apps that seem to do this, but we're are talking two different classes. But I'll ask anyway - Is there any practical way to have a scrollView with a static Xib over the top, where buttons defined in the UI don't move while a view underneath does. I'm sure it's easily doable in cocos2d, but for what I want to do, it's a bit overkill.
--- Edit ---
At the risk of embarrassing myself, I tried both possible solutions. Adding a button grammatically adds a button that moves when I scroll. Adding the nib seems to keep the scroll screen from scrolling. Here's the code, without trying to add any buttons everything works fine.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
NSLog(#"View Loaded");
[mdm setMapSetupInfoWithRows:60 columns:90 cellSize:32];
[mdm initMapDataWithOriginsUsingCenter:TRUE];
NSLog(#"MapViewContoller.mapArrayCount = %d",[[mdm mapArray]count]);
// create the MapView with the screen size create by MapDataManager
mapView = [[MapView alloc] initWithFrame:[mdm mapRect]];
// Create the UIScrollView to have the size of the window, matching the window (screen) size
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:[mdm windowRect]];
[scrollView setBounds:[mdm windowRect]];
// Tell the scrollview how big it is and set other options
[scrollView setContentSize:[mdm mapRect].size];
[scrollView setBounces:NO];
[scrollView setMinimumZoomScale:.5];
[scrollView setMaximumZoomScale:10];
[scrollView setDelegate:self];
[scrollView setBackgroundColor:[UIColor darkGrayColor]];
//add the MapView as a subview of the scrollView
[scrollView addSubview:mapView];
//add the scrollView to the current one....
[[self view] addSubview:scrollView];
[[NSBundle mainBundle] loadNibNamed:#"MapViewController" owner:self options:nil];
[self generNewMap];
}
Anything else I'm trying to do wrong? after looking at this more it does seem doable.

Answer 1

You should set things with a hierarchy like this.
UIViewController
UIScrollView
Static Buttons etc
Then in interface builder, or code, just add the static buttons etc to the self.view.
I do everything in code so it would look something like
-(void)viewDidLoad {
//add scrollview
appScroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
appScroll.pagingEnabled = YES;
[appScroll setCanCancelContentTouches:NO];
appScroll.bounds = CGRectMake(0, 0, 320, 480);
appScroll.contentSize = CGSizeMake(1600, 480);
[appScroll setScrollEnabled:YES];
appScroll.bounces = NO;
appScroll.showsHorizontalScrollIndicator = NO;
appScroll.showsVerticalScrollIndicator = NO;
appScroll.clipsToBounds = YES;
appScroll.delaysContentTouches = YES;
appScroll.center = (CGPoint){ 160, 240 };
[appScroll setBackgroundColor:[UIColor darkGrayColor]];
[self.view addSubview:appScroll];
//back
backBut = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"back.png"]];
backBut.center = (CGPoint){ 40, 430 };
backBut.transform = CGAffineTransformMakeScale(0.3,0.3);
[backBut setUserInteractionEnabled: YES];
[self.view addSubview: backBut];
}

Answer 2

The trick is to specify the owner when loading the XIB. For example:
Define an IBOutlet on your UIViewController
#property (nonatomic, strong) IBOutlet UIView* myScrollViewContent
Create a XIB, specify the owner as your UIViewController class
Wire the components defined in the XIB to the outlets defined in the UIViewController class
Then in code do this:
//Because the owner is 'self' the bundle loader will inject any properties defined . .
//. . . . and wired in the XIB to the owner's outlets
[[NSBundle mainBundle] loadNibNamed:#"MyXibName" owner:self options:nil];
//Now do something with self.myScrollViewContent - ie add it to the scroll view.
Custom Scroll-view sub-class
If you wanted should be able to use the same approach by creating a cusom scroll-view subclass and specifying an outlet there. . . The UIView would be loaded directly onto the sub-class, then. . . (you'd still have to add it as sub-view).
For more complex requirements, I personally like to build my views with pure code, but it is possible to arrange things neatly with XIBs.