Undo/Redo

  • This is a custom undo manager that can coalesce similar changes within the same group. This class is thread safe.

    PSPDFKit creates instances of this class internally and makes them available on various objects. You should not create new instances of this class yourself.

    Note

    Only use a perform/lock block if you’re not in any other lock controlled by PSPDFKit.
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    Declaration

    Objective-C

    
@interface PSPDFUndoController : NSObject

    Swift

    class UndoController : NSObject

  • Implement on model objects that should allow undo/redo.

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    Declaration

    Objective-C

    @protocol PSPDFUndoSupport <NSObject>

    Swift

    protocol UndoSupport : NSObjectProtocol