BNRDynamicTypeManager is a collection of helper classes that make it easier to use Dynamic Type in iOS 7 applications. Most importantly, it handles listening for UIContentSizeCategoryDidChangeNotification and updating the fonts of all "watched" views automatically.

To run the example project, clone the repo, make sure the Example target is select, and run it.

To run the unit tests, run pod install from the Tests directory first.

Usage - XIB Files and Storyboards

The simplest use case is if your are using XIB files or storyboards. After pulling BNRDynamicTypeManager into your project, change any instances of the following classes to the appropriate BNRDynamicTypeManager-provided subclasses (and make sure that one of the system Text Styles is selected as the view's font):

• UILabel → BNRDynamicTypeManagedLabel
• UIButton → BNRDynamicTypeManagedButton
• UITextField → BNRDynamicTypeManagedTextField
• UIView → BNRDynamicTypeManagedView

Usage - Programmatic View Creation

If you are creating views programmatically, use the same class mapping from Using XIB Files above, and use the designated initializer from their header files. The initializers have the same arguments as the UIKit parents with an additional textStyle: argument. For example, creating a managed UILabel and UITextView:

UILabel *label = [[BNRDynamicTypeManagedLabel alloc]
                       initWithFrame:CGRectZero
                           textStyle:UIFontTextStyleBody];
UITextView *textView = [[BNRDynamicTypeManagedTextView alloc]
                             initWithFrame:CGRectZero
                             textContainer:nil
                                 textStyle:UIFontTextStyleFootnote];

Usage - Without UIKit Subclasses

If you want more explicit control (e.g., if you already have a UIKit subclass that you're using, but you'd still like to have the font managed for you), use BNRDynamicTypeManager directly by telling it what objects to watch. If the object is one of the known UIKit classes or a subclass of them, use the provided methods. E.g., for UILabel:

UILabel *label = /* create a label */;

// Tell BNRDynamicTypeManager to update label.font now and any time the user
// changes their font size.
[[BNRDynamicTypeManager sharedInstance] watchLabel:label
                                         textStyle:UIFontTextStyleBody];

If you want to watch an object that isn't one of the known UIKit classes, but has a UIFont *font that can be reached via a keypath, use watchElement:fontKeypath:textStyle: instead. E.g., if there wasn't a method provided for UIButton:

UIButton *button = /* create a button */;

[[BNRDynamicTypeManager sharedInstance] watchElement:button
                                         fontKeypath:@"titleLabel.font"
                                           textStyle:UIFontTextStyleBody];

Requirements

iOS 7 and ARC.

Author

John Gallagher, [email protected]

License

BNRDynamicTypeManager is available under the MIT license. See the LICENSE file for more info.