Question

I have a small UIImageView and wish to centre it horizontally inside a UIView which is as wide as the screen.

I also wish to have the UIImageView stay centered when the device rotates.

How is this done?

Answer 1

This will center imageView horizontally within view:

imageView.frame.origin.x = CGRectGetMidX(view.bounds) - CGRectGetMidX(imageView.bounds)

This will ensure that imageView stays horizontally centered when its superview’s bounds change:

imageView.autoresizingMask = UIViewAutoResizingFlexibleLeftMargin|UIViewAutoResizingFlexibleRightMargin