问题
I am confused if 'Vary for Traits' is the right thing to define different set of layout constraints for Portrait & Landscape mode on iPhone. My objective is to have different layouts for Portrait & Landscape modes on the iPhone (doesn't matter on iPad). I tried 'Vary for Traits' and define different set of NSLayoutConstraints for Portrait & Landscape modes but it seems to be not working. Basically if I have constraints P1 & P2 active for portrait mode and C1 & C2 for landscape mode for the same view, that should do the job. Is 'Vary for Traits' really meant for this job?
Also how do I undo any variations I might have already added using 'Vary for Traits'?
回答1:
You need to do the following -
- Set the constraint in portrait mode.
- Select the Landscape mode.
- Disable constraints which you set in portrait mode.
- Assign new constraints for landscape.
- Go back in Portrait mode and Disable the constraints which you set in Landscape mode.
That's it.
Hope it works.
Feel free to comment if you have any confusion..
来源：https://stackoverflow.com/questions/46206418/vary-for-traits-in-xcode-8-orientation