MATLAB: How to keep the SetMethod and GetMethod of the dynamic properties when saving and loading the class instance in MATLAB R2019a

MATLABoop

I have a class with dynamic properties. These properties are added on-the-fly. But when I save and load a class instance the GetMethod and SetMethod are not set anymore. How can I keep my GetMethod and SetMethod?

Best Answer

You need to implement your own saveobj and loadobj. In the saveobj you convert your class instance into a struct and store some meta information about your dynamic properties. In the loadobj you convert the previously created struct back into your class instance. See the example below:
classdef myCls < dynamicprops
    properties
        Prop1
        Prop2
    end
    methods
        function s = saveobj(obj)
            s.Prop1 = obj.Prop1;
            s.Prop2 = obj.Prop2;
            dynPropNames = setdiff(properties(obj), {'Prop1' 'Prop2'});
            for i=numel(dynPropNames):-1:1
                p = findprop(obj, char(dynPropNames(i)));
                s.DynPropInfo(i).Name = p.Name;
                s.DynPropInfo(i).Value = obj.(p.Name);
                s.DynPropInfo(i).GetMethod = p.GetMethod;
                s.DynPropInfo(i).SetMethod = p.SetMethod;
            end
        end
    end
    methods(Static)
        function obj = loadobj(s)
            if isstruct(s)
                newObj = myCls;
                newObj.Prop1 = s.Prop1;
                newObj.Prop2 = s.Prop2;
                if isfield(s, 'DynPropInfo')
                    for i=1:numel(s.DynPropInfo)
                        p=addprop(newObj, s.DynPropInfo(i).Name);
                        p.SetMethod = s.DynPropInfo(i).SetMethod;
                        p.GetMethod = s.DynPropInfo(i).GetMethod;
                        newObj.(s.DynPropInfo(i).Name) = s.DynPropInfo(i).Value;
                    end
                end
                obj = newObj;
            else
                obj = s;
            end
        end
    end
end
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