实例变量是iOS类内的变量，而property是属性，为方便增加set和get的方法。

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

@interface ViewController () {
    NSInteger aaa;
    NSString *bbb;
}
@property (nonatomic, copy) NSString *agan;
@end

@implementation ViewController
@synthesize agan = _HAHA;

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //打印所有的properties
    u_int count;
    objc_property_t *properties= class_copyPropertyList([self class], &count);
    for (int i = 0; i < count ; i++){
        const char* propertyName = property_getName(properties[i]);
        NSString *strName = [NSString  stringWithCString:propertyName encoding:NSUTF8StringEncoding];
        NSLog(@"%@",strName);
    }
    
    NSLog(@"----------------------分割线------------------------");
    
    // 打印所有的成员变量
    Ivar *ivars = class_copyIvarList([self class], &count);
    for (int i = 0; i<count; i++) {
        // 取出成员变量
        Ivar ivar = *(ivars + i);
        // 打印成员变量名字
        NSLog(@"%s", ivar_getName(ivar));
        // 打印成员变量的数据类型
        NSLog(@"%s", ivar_getTypeEncoding(ivar));
    }
    
    NSLog(@"----------------------分割线------------------------");
    
    // 打印所有的方法
    unsigned int methCount = 0;
    Method *meths = class_copyMethodList([self class], &methCount);
    for(int i = 0; i < methCount; i++) {
        Method meth = meths[i];
        SEL sel = method_getName(meth);
        const char *name = sel_getName(sel);
        NSLog(@"%s", name);
    }
}

@end