set Width & Height alone on Views in iPhone Development

I am working on an iPhone project, where I need to change the width and height of a UIImageView dynamically. I have come across CGPointMake to change x & y positions alone, but what should I use for changing wid开发者_如何学Cth & height alone? There is something called CGSizeMake, but I am not able to make it work.

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Try with this.

CGRect aFrame = image.frame;

aFrame.size.width = newWidth;
aFrame.size.height = newHeight;

image.frame = aFrame;