OC object adds attributes to a category

Source: Internet
Author: User

OC object adds attributes to a category

You cannot add attributes to a category in an OC object. However, in actual development, attributes must be added to a category for better performance.

The added attributes cannot have default member variables. We need to implement the set and get methods by ourselves. We need to use the runtime

As follows:

 

# Import

 

 

// Associated object during running, dynamic attribute Addition

Const void * URLStringKey = URLStringKey;

// Set Method

-(Void) setUrlStr :( NSString *) urlStr

{

Objc_setAssociatedObject (self, URLStringKey, urlStr, OBJC_ASSOCIATION_COPY_NONATOMIC );

}

// Get Method

-(NSString *) urlStr

{

Return objc_getAssociatedObject (self, URLStringKey );

}


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