Question

I’ve search and found a few questions about this, but none containing an answer that worked for me.

This code centres a subview in the current view, if the device is in portrait, but not if it’s landscape. How do I make the centring work in landscape?

UIView *redView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
redView.backgroundColor = [UIColor redColor];
redView.center = [self.view convertPoint:self.view.center fromView:self.view.superview];
[self.view addSubview:redView];

Answer 1

Rather try using

 redView.center = [self.view convertPoint:self.view.center fromView:nil];

Works for me.

Note from the docs:

The view with point in its coordinate system. If view is nil, this
method instead converts from window base coordinates. Otherwise, both
view and the receiver must belong to the same UIWindow object

(should be called in viewDidAppear, not in viewDidLoad)