iOS- Detect current size classes on viewDidLoad

ios size-classes
user3193307 picture user3193307 · Apr 9, 2015 · Viewed 24.4k times · Source

I'm working with adaptive Layout on iOS 8 and I want to get exactly what the size classes are on viewDidLoad. Any ideas about that?

Answer

Bamsworld picture Bamsworld · Apr 9, 2015

As of iOS 8 UIViewController adopts the UITraitEnvironment protocol. This protocol declares a property named traitCollection which is of type UITraitCollection. You can therefor access the traitCollection property simply by using self.traitCollection

UITraitCollection has two properties that you want to access named horizontalSizeClass and verticalSizeClass Accessing these properties return an NSInteger. The enum that defines the returned values is declared in official documentation as follows- (this could potentially be added to in the future!)

typedef NS_ENUM (NSInteger, UIUserInterfaceSizeClass {
   UIUserInterfaceSizeClassUnspecified = 0,
   UIUserInterfaceSizeClassCompact     = 1,
   UIUserInterfaceSizeClassRegular     = 2,
};

So you could get the class and use say a switch to determine your code direction. An example could be -

NSInteger horizontalClass = self.traitCollection.horizontalSizeClass;
NSInteger verticalCass = self.traitCollection.verticalSizeClass;

switch (horizontalClass) {
    case UIUserInterfaceSizeClassCompact :
        // horizontal is compact class.. do stuff...
        break;
    case UIUserInterfaceSizeClassRegular :
        // horizontal is regular class.. do stuff...
        break;
    default :
        // horizontal is unknown..
        break;
}
// continue similarly for verticalClass etc.

Related questions

UIScrollView in Storyboard not working with iOS 8 Size Classes and Autolayout

So I'm trying to create a UIScrollView only in storyboard that allows me to add scrolling labels for more than the height of the VC. Here's what I did: Created UIScrollView that took up the size of the any width …

Read More
Custom Font Sizing in Xcode 6 Size Classes not working properly with Custom Fonts

Xcode 6 has a new feature where fonts and font sizes in UILabel, UITextField, and UIButton can be set automatically based on the size class of the current device configuration, right in the storyboard. For example, you can set a UILabel …

Read More
iPad Landscape and Portrait different layouts with Size Class

How to design iPad Landscape and Portrait screens with different Layouts using Size class. I could find only w-regular and h-regular for both orientations. Example: I need to align 2 views vertically in portrait and horizontally in landscape using Size Class

Read More