ios - auto layout issue in landscape view custom keyboard -

i have create keyboard.xib custom keyboard working fine in portrait mode in devices unable set constraint landscape mode.

self.keyboard=[[[nsbundle mainbundle] loadnibnamed:@"keyboard" owner:nil options:nil] objectatindex:0]; [self addgesturestokeyboard]; self.inputview=self.keyboard; 

someone tell me why happening, or constraint missing.

use size-classes build ui (in single xib)

https://developer.apple.com/library/ios/recipes/xcode_help-ib_adaptive_sizes/chapters/aboutadaptivesizedesign.html