OC Object add attribute to category

The OC object cannot add attributes to the classification, but in actual development, it is often necessary to add attributes to the classification for better performance.

The added property cannot have a default member variable, and we need to implement the set and get methods ourselves, using the runtime

As follows:

#import <objc/runtime.h>

// associated objects at run time, adding properties dynamically

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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OC Object add attribute to category