Relation between UIView and UIImageView regarding animations... iPhone SDK

Question

I have some animation blocks in my code which are causing my problems when I upgrade to iPhone OS4. I have read that it is now advised to use block-animations so I thought I would see if this solved my problems. Before I was using the following type of code to make an animation...

[UIImageView beginAnimations:nil context:NULL]; 

[UIImageView setAnimationDuration:30.0];

[UIImageView setAnimationRepeatCount:1e100f];

[UIImageView setAnimationCurve:UIViewAnimationCurveLinear];

[UIView setAnimationDelegate:self];

[UIView setAnimationDidStopSelector:@selector(stop)];

wheel.transform =CGAffineTransformMakeRotation(M_PI*-0.5);

[UIImageView commitAnimations];

I am now planning to change this to use this type of animation (taken from http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIView_Class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-SW111)

[UIView animateWithDuration:0.2

animations:^{ view.alpha = 0.0; }

completion:^(BOOL finished){ [view removeFromSuperview]; }]

My question is can I use the above block animation with UIImageView rather than UIView? Basically I guess I want to know what the difference is, if I animate a UIView would I just be animating a UIImage which is inside a UIView? Is this the same as a UIImageView then?!

Sorry I'm confused :-s