(转发)IOS高级开发~Runtime(一)

IOS高级开发~Runtime(一)

IOS高级开发~Runtime(二)

IOS高级开发~Runtime(三)

IOS高级开发~Runtime(四)

一些公用类:

@interface CustomClass : NSObject

- (void) fun1;

@end


@implementation CustomClass

- (void) fun1

{

    NSLog(@"fun1");

}

@end

@interface TestClass : NSObject

@end

@implementation TestClass

@end

别忘记引入库:#include<objc/runtime.h>


1、对象拷贝:id object_copy(id obj, size_t size)

- (void) copyObj

{

    CustomClass *obj = [CustomClassnew];

    NSLog(@"%p", &obj);

    

    id objTest = object_copy(obj,sizeof(obj));

    NSLog(@"%p", &objTest);


    [objTest fun1];

}

打印结果:

2013-07-26 15:35:11.547 HighOC[6859:c07] 0xbfffdf64

2013-07-26 15:35:11.547 HighOC[6859:c07] 0xbfffdf60

2013-07-26 15:35:11.547 HighOC[6859:c07] 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)


- (void) objectDispose

{

    CustomClass *obj = [CustomClassnew];

    object_dispose(obj);

    

    [obj release];

    [obj fun1];

}

打印结果:程序crash

malloc: *** error for object 0x758e6d0: 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)

- (void) setClassTest

{

    CustomClass *obj = [CustomClassnew];

    [obj fun1];

    

    Class aClass =object_setClass(obj, [CustomClassOtherclass]);

    //obj 对象的类被更改了    swap the isa to an isa

    NSLog(@"aClass:%@",NSStringFromClass(aClass));

    NSLog(@"obj class:%@",NSStringFromClass([objclass]));

    [obj fun2];

}

- (void) getClassTest

{

    CustomClass *obj = [CustomClassnew];

    Class aLogClass =object_getClass(obj);

    NSLog(@"%@",NSStringFromClass(aLogClass));

}


4、获取对象的类名  constchar *object_getClassName(id obj)


*obj = [CustomClassnew];

    NSString *className = [NSStringstringWithCString:object_getClassName(obj)encoding:NSUTF8StringEncoding];

    NSLog(@"className:%@", className);

}


 

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OCmethodC函数实现"];

    NSLog(@"a:%d", a);

}


 

 /**

  * 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);

}


相关文档及说明:

 

Obj-C的方法(method)就是一个至少需要两个参数(self,_cmd)的C函数

 

 IMP有点类似函数指针,指向具体的Method实现。

 

 

 向一个类动态添加方法


 BOOL class_addMethod(Class cls, SEL name, IMP imp, const char *types)

 参数说明:

 cls:被添加方法的类

 name:可以理解为方法名

 imp:实现这个方法的函数

 types:一个定义该函数返回值类型和参数类型的字符串

 

 

 

 class_addMethod([TestClass class], @selector(ocMethod:), (IMP)testFunc, "i@:@");

 

 其中types参数为"i@:@“,按顺序分别表示:

 i:返回值类型int,若是v则表示void

 @:参数id(self)

 ::SEL(_cmd)

 @:id(str)

 

 

 官方文档:

 

 https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html

 https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html




 

IOS高级开发~Runtime(一)

http://blog.csdn.net/zfpp25_/article/details/9496705

IOS高级开发~Runtime(二)

http://blog.csdn.net/zfpp25_/article/details/9497187

IOS高级开发~Runtime(三)

http://blog.csdn.net/zfpp25_/article/details/9497721

IOS高级开发~Runtime(四)

http://blog.csdn.net/zfpp25_/article/details/9498233

原文地址:https://www.cnblogs.com/MengXY/p/4156724.html