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UILabel sub class supporting rotations at 0, 90, 180 and 270º, supports auto layout and IB live rendering

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mutech/aka-ios-rotatablelabel

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AKA Rotatable Label

What is does

AKARotatableLabel is a UILabel sub class that supports rotations at multiples of 90º.

It looks like this (Animations are jumpy due to framerate or the animated gif):

Demo

In interface builder:

IB custom class

and:

IB properties

How to install

For the moment, just clone the framework from Github or copy the AKARotatableLabel.[mh] files to your project. If I see that there is more than one user asking I'll make a pod.

What works and what doesn't

Angles

The label only supports angles which are multiples of 90ºs. Other values will be rounded to meet this requirement.

Autolayout

Works fine with autolayout, as long as the label's size is determined by it's intrinsic size. If you see problems, embed the label in a view and add >= constraints (one or more for either horizontal and/or vertical sides), that should work fine.

Animations

Changing the rotation angle inside animation blocks works fine (also in conjunction with constraints) in all cases covered in my use cases.

How it works

I'm using two labels, the one that's actually rotated is a subview of the first.

The reason why I'm using a label and not a plain view as container is to support configuration of the label via interface builder (with a UIView and IBInspectable properties you can't configure fonts).

The reason why I'm using a container view in first place is because it seems to be impossible or at least too hard to make transformed views work properly with autolayout.

Status

I only had the time to make the features work that I needed until now and also no time to write UI or unit tests. Will come back to this later.

The class will probably move to AKACommons

License

2-clause BSD, see LICENSE.txt

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UILabel sub class supporting rotations at 0, 90, 180 and 270º, supports auto layout and IB live rendering

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