Layer naming and groups

[vpdn]

Layers are currently all named "Layer". Would be nice to structure the layers into groups.

Would be cool to put sublayers into psd groups and rename "Layer" to something more meaningful: E.g.

• Use UIAccessibility
• Use layer.name if set
• If layer.name not set, fall back to auto incrementing counter (like "Layer 1.2.1")
• If layer.delegate is set, name PSD layer based on class name (e.g. "ImageView 1.2.1")
• If layer.delegate is a know class, could do something smarter. E.g. for UILabel, use label.text or inspect the accessibilityIdentifier

[ashikase]

I forked MMLayershots today and created a version that supports layer grouping. I managed this by replacing PSDWriter with SFPSDWriter.

This is just something I threw together quickly so I did not create a pull request, but if you are interested the code is available at:

http://github.com/ashikase/MMLayershots/tree/layer_grouping

[vpdn]

@ashikase Cool thanks. I was initially thinking of using FMPSD but it seemed rather big compared to PSDWriter, due to the support of layer styles, PSD read support etc. all stuff that we don't really use. I wasn't aware of SFPSDWriter, will have a look!

[vpdn]

@ashikase Looks cool, will clean up and pull in. The restructuring will also fix #9.

[vpdn]

✓ Layer groups

@ashikase I merged (ashikase/MMLayershots@33fcb94) back with 5a7fa5f, thanks! Also added you to the attribution section, hope it's ok. If you want any rewording, let me know.