Question

At start UIImageViewObj frame = CGRectMake(20, 350, 20, 1);

In code I do next:
[UIImageViewObj setBounds: CGRectMake(20, 350, 20, 200)];

Changing the bounds height of UIImageView at run time a change occurs from the center of a UIImageViewObj up and down, how to make change happen from the bottom to the top.

Answer 1

To set the anchor point you can just do

imageView.layer.anchorPoint = CGPointMake(0.5,0.5)

this will set the anchor point to the middle. if you want it in the left bottom part

imageView.layer.anchorPoint = CGPointMake(0,1);

Just make sure you add Quazrtcore to your frameworks

Hope i understood you correctly.