Completion block

AMViewController.h

//
//  AMViewController.h
//  testAnimation
//
//  Created by Greg Cerveny on 1/30/12.
//  Copyright (c) 2012 Artful Medium, LLC. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface AMViewController : UIViewController 

@property (nonatomic, strong) UILabel *myLabel;
@property (nonatomic, assign) NSInteger testNumber;

@end

AMViewController.m

//
//  AMViewController.m
//  testAnimation
//
//  Created by Greg Cerveny on 1/30/12.
//  Copyright (c) 2012 Artful Medium, LLC. All rights reserved.
//

#import "AMViewController.h"

@implementation AMViewController

@synthesize myLabel, testNumber;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

    myLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 200, 20)];
    myLabel.text = @"Test!";
    [self.view addSubview:myLabel];
    
    self.testNumber = 100;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    
    [UIView animateWithDuration:1.0 
                     animations:^(void){self.myLabel.center = CGPointMake(160,230);} 
                     completion:^(BOOL finished){ NSLog(@"Number is %i", self.testNumber);}
     ];
}

- (void)viewWillDisappear:(BOOL)animated
{
	[super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
	[super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end