aView.center = CGPointMake(150, 150); // set center
or
aView.frame = CGRectMake( 100, 200, aView.frame.size.width, aView.frame.size.height ); // set new position exactly
or
aView.frame = CGRectOffset( aView.frame, 10, 10 ); // offset by an amount
Edit:
I didn't compile this yet, but it should work:
#define CGRectSetPos( r, x, y ) CGRectMake( x, y, r.size.width, r.size.height )
aView.frame = CGRectSetPos( aView.frame, 100, 200 );
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