Runtime | Category | 分类添加属性

准备工作 导入需要的头文件

#import 

创建分类并声明一个属性

#import "Persion.h"
@interface Persion (mult)
@property (nonatomic,copy) NSString* nick;
@end

分类中属性实现

const char* name = "rylsj";
- (void) setNick:(NSString *)nick {
    objc_setAssociatedObject(self, &name, nick, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (NSString*) nick {
    return objc_getAssociatedObject(self, &name);
}

代码调用

- (void) rylsj_Test {
    self.persion = [[Persion alloc] init];
    self.persion.nick = @"RunyaLsj";
    NSLog(@"%@", self.persion.nick);
}