RunTime运行时之改变私有属性的值

#import "ViewController.h"
#import <objc/runtime.h>

@interface ViewController (){
    NSString *str1;
}

@property (nonatomic, copy) NSString *str2;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self changeVarVaule];
}

#pragma 改变属性值(私有和公开)
- (void)changeVarVaule{
    unsigned int outCount = 0;
    //获取所有属性列表(包括私有的)
    Ivar *vars= class_copyIvarList([self class], &outCount);
    for(int i = 0;i < outCount;i++){
        //循环取出属性
        Ivar var = vars[i];
        if(i == 0){
            //设置属性的值方式一
            object_setIvar(self, var, @"piaojin1");
        }else{
            //设置属性的值方式二
            const char *varName = ivar_getName(var);//获取属性名字
            [self setValue:@"piaojin2" forKey:[NSString stringWithUTF8String:varName]];//通过KVC设置属性值
        }
    }
    NSLog(@"str1:%@,str2:%@",str1,self.str2);
}

@end