iPhone 4 play animation when a view is presented

I want to position buttons within my view in a circle around a fixed point. I can do this with :

 button.layer.anchorPoint = CGPointMake(offsetX/button.frame.size.width, offsetY/button.frame.size.height);

button.transform = [self calculateLabelPositionFromFixedPoin开发者_StackOverflow中文版tWithOffsetClockwiseInDegrees:commonAngleRatio*startSpacing*spacingRatio++];

Where the calculateLabelPositionFromFixedPointWithOffsetClockwiseInDegrees:angleInDegrees is a function that I wrote to give me CGAfflineTransformMakeRotation .

I would like the buttons to animate "orbiting" into the correct position when the view is presented. I tried putting a timer that will call animation into "viewWillAppear", but it doesn't seem to work.

Edit: I'm subclassing a UIViewController twice:

@interface HomeScreenAbstractParentController : UIViewController<UITableViewDelegate, UITableViewDataSource, UIGestureRecognizerDelegate, ContextActionDelegate, RemoteControlDelegate> {...}

and

@interface AnimatedController : HomeScreenAbstractParentController
{}

Within the AnimatedController the following methods do not get called. I have the AnimatedController's view added to the back of the homeScreenController (as in Weather app), and when a user presses a button, the view flips to it's backside. The backside should animate controls when this is done.

-(void)viewWillAppear:(BOOL)animated

{
    NSLog(@"viewWillAppear");
    [super viewWillAppear:animated];

}


-(void)viewDidAppear:(BOOL)animated
{ 
    NSLog(@"viewDidAppear");
    [super viewDidAppear:animated];
    [self animateControls:nil];


}

At which point in the lifecycle of the app above would I schedule the timer to animate buttons into positions? Is it when I flip the view over?

---

in your viewController :

-(void)viewDidAppear {

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1]; //amount of seconds animation should run
button.transform = [self calculateLabelPositionFromFixedPointWithOffsetClockwiseInDegrees:commonAngleRatio*startSpacing*spacingRatio++];
[UIView commitAnimations];


}