CODEWITHSUNDEEP
react-nativereact-native-ios
XuDong Wu
XuDong Wu

Reputation: 670

is RCT_EXPORT_VIEW_PROPERTY can be inherited

I have several views . one is parent, the others are children.

parent has a field eg: name

I have RCT_EXPORT_VIEW_PROPERTY(name, NSString); in parent.m, but it doesn't work.

I have to copy RCT_EXPORT_VIEW_PROPERTY(name, NSString); to all the children .

How to inherit RCT_EXPORT_VIEW_PROPERTY .

Upvotes: 0

Views: 727

Answers (1)

Alexander Guschin
Alexander Guschin

Reputation: 469

No, properties cannot be inherited without source code modification of React-Native. React-Native looking only for methods implemented by concrete class without methods implemented by its superclasses.

You can define macro in superclass and use this macro inside subclasses:

#define EXPORT_COMMON_PROPERTIES \
RCT_EXPORT_VIEW_PROPERTY(propertyDefinedInParent, NSString) \
RCT_EXPORT_VIEW_PROPERTY(anotherPropertyDefinedInParent, NSString)

And then in .m file of children just use

EXPORT_COMMON_PROPERTIES;

UPDATE: We are actually not inheriting any properties from RCTViewManager. React-native exports all native props from ViewManagers as constants to js level. And then it just concatenate RCTViewManager's props with our component props:

 // The ViewConfig doesn't contain any props inherited from the view manager's
  // superclass, so we manually merge in the RCTView ones. Other inheritance
  // patterns are currenty not supported.
  const nativeProps = {
    ...UIManager.RCTView.NativeProps,
    ...viewConfig.NativeProps,
  };

- source code of requireNativeComponent function. But on native level we are not inheriting any properties from RCTViewManager.

Upvotes: 2

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