IOS adds additional properties to the system's objects----associated properties

@interface NSObject (OBJC)//

@property (nonatomic, strong) NSString *name;

Adding attributes to a system's class in a taxonomy cannot add additional attributes to a class that moves the system

@end

#import "Nsobject+objc.h"

#import <objc/message.h>

@implementation NSObject (OBJC)

static NSString *_name;

-(void) SetName: (NSString *) name{

Add an attribute to that object

Key

Objc_setassociatedobject (self, @ "name", name, objc_association_copy);

_name = name;

}

-(NSString *) name{

return Objc_getassociatedobject (self, @ "name");

return _name;

} @end

IOS adds additional properties to the system's objects----associated properties