Animate a UIButton into place from off screen when app loads
-(void)viewWillAppear:(BOOL)animated
{
    CGPoint newLeftCenter = CGPointMake( 15.0f + myCocoButton.frame.size.width / 2.0f, myCocoButton.center.y);
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:4.0f];
    myCocoButton.center = newLeftCenter;
    [UIView commitAnimations];

}

@implementation MyViewController {
    CGPoint _button0TrueCenter;
    CGPoint _button1TrueCenter;
    CGPoint _button2TrueCenter;
    CGPoint _button3TrueCenter;
}

static void moveButtonAndSaveCenter(UIButton *button, CGPoint offscreenCenter, CGPoint *trueCenter) {
    *trueCenter = button.center;
    button.center = offscreenCenter;
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    if (animated) {
        moveButtonAndSaveCenter(self.button0, CGPointMake(-100, 100), &_button0TrueCenter);
        moveButtonAndSaveCenter(self.button1, CGPointMake(420, 100), &_button1TrueCenter);
        moveButtonAndSaveCenter(self.button2, CGPointMake(-100, 200), &_button2TrueCenter);
        moveButtonAndSaveCenter(self.button3, CGPointMake(420, 200), &_button3TrueCenter);
    }
}

static void animateButton(UIButton *button, CGPoint newCenter, NSTimeInterval delay) {
    [UIView animateWithDuration:.25 delay:delay options:0 animations:^{
        button.center = newCenter;
    } completion:nil];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    if (animated) {
        animateButton(self.button0, _button0TrueCenter, 0);
        animateButton(self.button1, _button1TrueCenter, 0.2);
        animateButton(self.button2, _button2TrueCenter, 0.4);
        animateButton(self.button3, _button3TrueCenter, 0.6);
    }
}

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

    CGAffineTransform transform = CGAffineTransformMakeTranslation(0.f, -200.f);

    [self.buttons enumerateObjectsUsingBlock:^(UIButton *button, NSUInteger idx, BOOL *stop) {

       button.transform = transform; // This translates the view's off the top of the screen

       [UIView animateWithDuration:0.25f
                             delay:0.25f * idx
                           options:UIViewAnimationCurveEaseOut            // No point doing easeIn as the objects are offscreen anyway
                        animations:^{
                            button.transform = CGAffineTransformIdentity;
                      } completion:nil];

       }];
}