Runtime 创建动态一个类 添加成员变量 属性

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    这篇文章主要介绍OC Runtime怎么动态创建类，添加成员变量，添加属性，对象动态绑定keyValue,添加方法。 （主要介绍成员变量和属性） 对于概念还不理解的可以看之前的博客。代码说的再多不如自己写一遍，写过之后肯定有不同的理解。好脑子不如烂笔头，没有什么概念要说的，代码里有注释，下面直接上代码。

Demo地址：https://github.com/RainManGO/RuntimeVarDemo

////  ViewController.m//  Runtime动态创建基础详解////  Created by apple on 2017/7/14.//  Copyright © 2017年 ZY. All rights reserved.//#import "ViewController.h"#import <objc/runtime.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    [self creatHeroClass];}-(void)creatHeroClass{    /*  创建类     *  参数1 父类  参数二 类名 参数3关于内存默认     */    Class  Hero = objc_allocateClassPair([NSObject class], "Hero", 0);        class_addMethod(Hero, @selector(R:), (IMP)R, "@@:@");//添加方法        class_addIvar(Hero, "Q", sizeof(NSString *), 0, "@");//添加成员变量    class_addIvar(Hero, "W", sizeof(NSString *), 0, "@");//添加成员变量        //添加属性实现setter  getter方法    class_addMethod(Hero, @selector(setW:), (IMP)setW, "v@:@");    class_addMethod(Hero, @selector(getW), (IMP)getW, "@@:");        //注册类    objc_registerClassPair(Hero);        //实例化应用    id hanbing = [[Hero alloc]init];        //objc_setAssociatedObject 绑定key  value    objc_setAssociatedObject(hanbing, @"beidong", @"寒冰的被动", OBJC_ASSOCIATION_COPY);    NSLog(@"%@",objc_getAssociatedObject(hanbing, @"beidong"));        //通过kvc设置上面定义的成员变量    [hanbing setValue:@"寒冰射手的Q" forKey:@"Q"];        [hanbing setW:@"寒冰的w"];    NSLog(@"%@",[hanbing getW]);        //类的属性    objc_property_attribute_t type = { "T", "@\"NSString\"" };    objc_property_attribute_t ownership = { "C", "" }; // C = copy    objc_property_attribute_t backingivar  = { "V", "E" };    objc_property_attribute_t attrs[] = { type, ownership, backingivar };    class_addProperty(Hero, "E", attrs, 3);        //遍历属性查看    unsigned int outCount, i;    objc_property_t *properties = class_copyPropertyList([Hero class], &outCount);    for (i = 0; i < outCount; i++) {        objc_property_t property = properties[i];        fprintf(stdout, "Hero %s : %s\n", property_getName(property), property_getAttributes(property));    }        [hanbing R:@"德玛西亚"];}#pragma mark  OC方法//OC方法不会调用，但是必须得写。实际调用IMP针织实现。-(void)setW:(NSString *)w{    }-(NSString *)getW{    return nil;}-(NSString *)R:(NSString *)emery{        return nil;}#pragma mark  IMP方法void setW(id self,SEL cmd,NSString * str){    Ivar  w = class_getInstanceVariable([self class], "W");    NSString * oldW = object_getIvar(self, w);    if (oldW!=str) {        object_setIvar(self, w, [str copy]);    }}NSString * getW(id self,SEL cmd){    Ivar  w = class_getInstanceVariable([self class], "W");    return object_getIvar(self, w);}id R(id self,SEL cmd,id emery){    Ivar v  = class_getInstanceVariable([self class], "Q");    NSString * vStr = object_getIvar(self, v);    NSString * result = [NSString stringWithFormat:@"%@R死了%@",vStr,emery];    NSLog(@"%@", result);    return [NSString stringWithFormat:@"R死了%@",emery];}@end