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#import "ViewController.h"
#import <objc/runtime.h>
 
@interface ViewController ()
@end
 
@implementation ViewController
- (void)viewDidLoad
{
    [super viewDidLoad];
 
    // 动态创建一个类
    Class newClass = objc_allocateClassPair(NSObject.class, "SAObject", 0);
    // 添加类成员
    class_addIvar(newClass, "name", sizeof(NSString *), 1<<0, @encode(NSString *));
    class_addIvar(newClass, "age", sizeof(int), 1<<0, @encode(int));
    // 注册类
    objc_registerClassPair(newClass);
 
    // 遍历类成员
    unsigned int outCount;
    Ivar *ivars = class_copyIvarList(newClass, &outCount);
    for (int i = 0; i < outCount; i++) {
        Ivar ivar = ivars[i];
        NSLog(@"%s %s", ivar_getName(ivar), ivar_getTypeEncoding(ivar));
    }
 
    // 内存释放
    free(ivars);
    objc_disposeClassPair(newClass);
}
 
@end

#import "ViewController.h" #import <objc/runtime.h> @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // 动态创建一个类 Class newClass = objc_allocateClassPair(NSObject.class, "SAObject", 0); // 添加类成员 class_addIvar(newClass, "name", sizeof(NSString *), 1<<0, @encode(NSString *)); class_addIvar(newClass, "age", sizeof(int), 1<<0, @encode(int)); // 注册类 objc_registerClassPair(newClass); // 遍历类成员 unsigned int outCount; Ivar *ivars = class_copyIvarList(newClass, &outCount); for (int i = 0; i < outCount; i++) { Ivar ivar = ivars[i]; NSLog(@"%s %s", ivar_getName(ivar), ivar_getTypeEncoding(ivar)); } // 内存释放 free(ivars); objc_disposeClassPair(newClass); } @end