创建公共类：
@interface CustomClass : NSObject
- (void) fun1;
@end
@implementation CustomClass
-(void)fun1
{
NSLog(@"fun1");
}
@end
@interface TestClass : NSObject
@end
@implementation TestClass
@end
1、对象拷贝：id object_copy(id obj, size_t size)
CustomClass * obj = [CustomClass new];
NSLog(@"%p",&obj);
id objTest = object_copy(obj, sizeof(obj));
NSLog(@"%p",&objTest);
[objTest fun1];
打印结果：
2014-10-20 09:51:48.973 runtimetest[2573:303] 0x7fff5fbff818
2014-10-20 09:51:48.983 runtimetest[2573:303] 0x7fff5fbff810
2014-10-20 09:51:48.984 runtimetest[2573:303] fun1
说明：
object_copy 函数实现了对象的拷贝。
2、对象释放 id object_dispose(id obj)
object_dispose(objTest);
[objTest release];
runtimetest(2791,0x7fff791b2310) malloc: *** error for object 0x100202950: pointer being freed was not allocated
3、更改对象的类／获取对象的类Class object_setClass(id obj, Class cls) ／ Class object_getClass(id obj)
CustomClass * obj = [CustomClass new];
[obj fun1];
Class aClass = object_setClass(obj, [CustomClassOther class]);
NSLog(@"aClass:%@",NSStringFromClass(aClass));
NSLog(@"obj class:%@",NSStringFromClass([obj class]));
[obj fun2];
运行结果：
2014-10-20 10:09:24.619 runtimetest[3536:303] aClass:CustomClass
2014-10-20 10:09:24.619 runtimetest[3536:303] obj class:CustomClassOther
2014-10-20 10:09:24.620 runtimetest[3536:303] fun2
CustomClass * obj = [CustomClass new];
Class objClass = object_getClass(obj);
NSLog(@"%@",NSStringFromClass(objClass));
运行结果：
2014-10-20 10:12:34.047 runtimetest[3726:303] CustomClass
4、获取对象的类名 constchar *object_getClassName(id obj)
CustomClass * obj = [CustomClass new];
NSString * className =[NSString stringWithCString:object_getClassName(obj) encoding:NSUTF8StringEncoding];
NSLog(@"%@",className);
运行结果:
2014-10-20 10:22:54.514 runtimetest[4160:303] CustomClass
5、给一个类添加方法
BOOL class_addMethod(Class cls,SEL name,IMP imp,
const char *types)
/**
* 一个参数
*
*/
int cfunction(id self, SEL _cmd, NSString *str) {
NSLog(@"%@", str);
return10;//随便返回个值
}
- (void) oneParam {
TestClass *instance = [[TestClassalloc]init];
// 方法添加
class_addMethod([TestClassclass],@selector(ocMethod:), (IMP)cfunction,"i@:@");
if ([instance respondsToSelector:@selector(ocMethod:)]) {
NSLog(@"Yes, instance respondsToSelector:@selector(ocMethod:)");
} else
{
NSLog(@"Sorry");
}
int a = (int)[instanceocMethod:@"我是一个OC的method，C函数实现"];
NSLog(@"a:%d", a);
}
2014-10-20 10:47:25.738 runtimetest[5333:303] Yes, instance respondsToSelector:@selector(ocMethod:)
2014-10-20 10:47:25.748 runtimetest[5333:303] 我是一个OC的method，C函数实现
2014-10-20 10:47:25.749 runtimetest[5333:303] a:10
/**
* 两个参数
*
*/
int cfunctionA(id self, SEL _cmd, NSString *str, NSString *str1) {
NSLog(@"%@-%@", str, str1);
return20;//随便返回个值
}
- (void) twoParam {
TestClass *instance = [[TestClassalloc]init];
class_addMethod([TestClassclass],@selector(ocMethodA::), (IMP)cfunctionA,"i@:@@");
if ([instance respondsToSelector:@selector(ocMethodA::)]) {
NSLog(@"Yes, instance respondsToSelector:@selector(ocMethodA::)");
} else
{
NSLog(@"Sorry");
}
int a = (int)[instanceocMethodA:@"我是一个OC的method，C函数实现" :@"-----我是第二个参数"];
NSLog(@"a:%d", a);
}