利用Runtime为Category添加属性

1.首先新建一个Pseron类

@interface Person : NSObject

@property (nonatomic, copy) NSString *name;

@end

2.新建一个person的分类Person+addProperty

#import "Person.h"

@interface Person (addProperty)

@property(nonatomic, copy)NSString *addProperty;

@end

#import "Person+addProperty.h"

#import <objc/runtime.h>

@implementation Person (addProperty)

static char strAddrKey = 'a';

- (NSString *)addProperty{

    

    return objc_getAssociatedObject(self, &strAddrKey);

}

-(void)setAddProperty:(NSString *)addProperty{

    

    objc_setAssociatedObject(self, &strAddrKey, addProperty, OBJC_ASSOCIATION_COPY_NONATOMIC);

}

@end