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traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
UITraitCollection *horizontalSizeClass = [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassCompact];
[self setOverrideTraitCollection:horizontalSizeClass forChildViewController:self.viewController];
UITraitCollection *verticalSizeClass = [UITraitCollection traitCollectionWithVerticalSizeClass:UIUserInterfaceSizeClassCompact];
UITraitCollection *horizontalSizeClass = [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassCompact];
NSArray *traitCollectionArray = [NSArray arrayWithObjects:verticalSizeClass, horizontalSizeClass, nil];
UITraitCollection *combinedTraits = [UITraitCollection traitCollectionWithTraitsFromCollections:traitCollectionArray];
[self setOverrideTraitCollection:combinedTraits forChildViewController:self.viewController];
- (void) traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
Введение в Size Classes в Xcode 6