gistfile1.m

- (IBAction)open:(id)sender
{
    CATransform3D perspectiveTransform = CATransform3DIdentity;
    perspectiveTransform.m34 = 1.0f / -2000.0f;
    
    CATransform3D endScaleTransform = CATransform3DMakeScale(0.8f, 0.8f, 1.0f);
    
    CATransform3D startTransform = perspectiveTransform;
    CATransform3D endTransform = CATransform3DConcat(endScaleTransform, perspectiveTransform);
    CATransform3D middleTransform = CATransform3DConcat(CATransform3DMakeRotation(M_PI_4 / 2.0f, 1, 0, 0), endTransform);
    
    CAKeyframeAnimation *pushBackAnim = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
    pushBackAnim.values = @[[NSValue valueWithCATransform3D:startTransform], [NSValue valueWithCATransform3D:middleTransform], [NSValue valueWithCATransform3D:endTransform]];
    pushBackAnim.duration = 0.3f;
    pushBackAnim.calculationMode = kCAAnimationCubic;
    pushBackAnim.removedOnCompletion = NO;
    pushBackAnim.fillMode = kCAFillModeForwards;
    
    [self.view.layer addAnimation:pushBackAnim forKey:@"pushBackAnimation"];
    
    
    UIWindow *modalWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    modalWindow.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
    modalWindow.opaque = NO;
    modalWindow.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.3f]
    
    
    UIViewController *vc = [[UIViewController alloc] init];
    vc.view.backgroundColor = [UIColor greenColor];
    vc.view.opaque = NO;
    modalWindow.rootViewController = vc;
    
    dispatch_async(dispatch_get_main_queue(), ^{
        [modalWindow setHidden:NO];
        [modalWindow makeKeyAndVisible];
    });
    
    
    /*CGFloat modalHeight = 200.0f;
    UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(modalWindow.bounds) - modalHeight, CGRectGetWidth(modalWindow.bounds), modalHeight)];
    testView.backgroundColor = [UIColor greenColor];
    testView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleTopMargin;
    [modalWindow addSubview:testView];*/
}