There's one in iOS as well.

lotsofpulp · on March 23, 2020

Only for portrait mode. Never made sense to me why they only allow locking in one orientation and not landscape.

gtufano · on March 23, 2020

It's "lock rotation", not "lock portrait". If you have the device in landscape when you lock it, it will lock in landscape.

lotsofpulp · on March 23, 2020

I just did it on an iphone 6S Plus and an iPhone XS both with ios13+, and while in landscape, if I press lock rotation, it changes to portrait and then locks it.

I’ve experienced this since iPhone 3G or iPhone 4, so I assume this is how they have designed it.

https://discussions.apple.com/thread/8237975

This website shows a workaround for it:

https://www.igeeksblog.com/how-to-lock-rotation-in-iphone-la...

manigandham · on March 23, 2020

No, the feature is called "Portrait Orientation Lock" - it will only lock it in portrait mode and not landscape.

https://support.apple.com/en-us/HT204547