• (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

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