iOS - adding/removing a subview programmatically

Question

Ok I want to add a UIImageView as a subview and then remove it after a couple of seconds in the way a splash screen works. I found three different approaches to do it but I

Answer 1

You could use an animation attached to the view's layer. Code below fades the view out - but there are many other ways to remove it. (you need to attach the QuartzCore framework)

myImageView.layer.opacity = 0.0;
// this is the state the view will be in after the animation (e.g. invisible)

CABasicAnimation *theFade;

theFade = [CABasicAnimation animationwithKeyPath:@"opacity"];
theFade.duration = 10.0; 
theFade.fromValue = [NSNumber numberWithFloat:1.0]; // i.e. visible
theFade.toValue = [NSNumber numberWithFloat:0.0]; // i.e. invisible 
[myImageView.layer addAnimation:theFade forKey:@"animateOpacity"]; 

Answer 2

If you are not going to use the image again, there is no need to keep a pointer to it. Further, if you use IBOutlet, you need to add the view in IB as well. In this specific example I would say option 3 makes the most sence, especially considering that with this choice you can began with a standard "view based application" template and just add the bits about the image view and leave the rest alone. One last observation of choice 3 though; the 2 messages to window;

 [self.window addSubview:myViewController.view];

 [self.window makeKeyAndVisible];

Appear to be outside the scope of any method. This is likely just a copy and paste error, but make note that they should located within "didFinishLaunchingWithOptions:"