IOS高级开发~Runtime(一)

论坛 期权论坛 脚本     
匿名技术用户   2020-12-21 13:32   11   0

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)


- (void) getClassName

{

CustomClass *obj = [CustomClassnew];

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

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

}


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OCmethodC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




分享到 :
0 人收藏
您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

积分:7942463
帖子:1588486
精华:0
期权论坛 期权论坛
发布
内容

下载期权论坛手机APP