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全网最全的Runtime的分享了吧。一棵大树!

2021-11-04  本文已影响0人  iOS祈峰

前言

学如逆水行舟,不进则退。共勉!!!

做iOS开发这么多年了,给我的感觉就是现在新鲜血液越来越少了。只剩下中高级人员越来越卷,新人也不愿意进入iOS开发圈子。但是我自认为成为iOS开发还是不错的,相比于其他的IT行业还是没有那么卷,而且薪资待遇也是非常不错的,而且现在中高级开发甚至是有缺口的,毕竟苹果在全球市场的占比也是越来越多了,所以根本不用担心找不到工作,担心的其实是怎样提升自己。

说了那么多,基于我自己的开发经验给大家总结了一份runtime资料,希望能给需要的人提供到一点帮助。如有错误还请在评论区留言指正。希望看官都能点点赞啥的支持一下,让更多人的人看到。也可以关注一下我主页,加入我的圈子,互相交流学习。我也会持续分享一些对于ios的一些认知。

编码值

//编码值  含义 
//c 代表char类型
//i 代表int类型
//s 代表short类型
//l 代表long类型,在64位处理器上也是按照32位处理
//q 代表long long类型
//C 代表unsigned char类型
//I 代表unsigned int类型
//S 代表unsigned short类型
//L 代表unsigned long类型
//Q 代表unsigned long long类型
//f 代表float类型
//d 代表double类型
//B 代表C++中的bool或者C99中的_Bool
//v 代表void类型
//* 代表char *类型
//@ 代表对象类型
//# 代表类对象 (Class)
//: 代表⽅法selector (SEL)
//[array type] 代表array
//{name=type…} 代表结构体//(name=type…) 代表union
//bnum A bit field of num bits
//^type A pointer to type
//? An unknown type (among other things, this code is used for function pointers)

Working with Instances(使⽤实例)

ARC模式不可⽤object_copy
ARC模式不可⽤object_dispose
ARC模式不可⽤object_setInstanceVariable
ARC模式不可⽤object_getInstanceVariable
ARC模式不可⽤object_getIndexedIvars

Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]); 
//参数:1.对象obj 2.实例变量ivar 
//返回:id 
NSString *result = object_getIvar(self, ivar); 
NSLog(@"lg_object_getIvar:%@",result);
object_getIvar(获取对象中实例变量的值)

Ivar ivar =class_getInstanceVariable(self.class, [@"_logic" UTF8String]); 
//参数:1.对象obj 2.实例变量ivar 3.实例变量的值id object_setIvar(self, ivar, @"123456");
object_setIvar(设置对象中实例变量的值)

//参数:对象obj
//返回:对象的类名 
const char*result = object_getClassName(self); 
NSLog(@"lg_object_getClassName:%@",[NSString stringWithUTF8String:result]);
object_getClassName(获取对象的类名)

//参数:对象obj
 //返回:类Class 
Class result = object_getClass(self); 
NSLog(@"lg_object_getClass:%@",result);
object_getClass(获取对象的类对象)

//参数:1.对象obj 2.类Class 
//返回:类Class 
Class result = object_setClass(self, [UIViewController class]); 
NSLog(@"lg_object_setClass:%@",result);
object_setClass(设置对象的类)

Obtaining Class Definitions(获取类定义)

//参数:1.传NUll获取当前注册的所有类 2.传0 
//返回:所有注册类的总数 
int result = objc_getClassList(NULL, 0); 
NSLog(@"lg_objc_getClassList:%d",result);
objc_getClassList(获取已注册的类的数量)

unsigned int outCount; 
//参数:整数指针 
//返回:已注册的类的指针列表 
Class *result =objc_copyClassList(&outCount); 
for (int i = 0; i < outCount; i++) { 
NSLog(@"lg_objc_copyClassList:%s", class_getName(result[i])); } free(result);
objc_copyClassList(获取所有已注册的类)

//参数:类的名称 
//返回:类Class 
Class result =objc_lookUpClass([@"ViewController" 
UTF8String]); 
NSLog(@"lg_objc_lookUpClass:%@",result);
objc_lookUpClass(获取指定的类定义)

//参数:类的名称
 //返回:类Class
 Class result =objc_getClass([@"ViewController" UTF8String]); 
NSLog(@"lg_objc_getClass:%@",result);
objc_getClass(获取指定的类定义)

//参数:类的名称
 //返回:类Class 
Class result = objc_getRequiredClass([@"ViewController" UTF8String]); 
NSLog(@"lg_objc_getRequiredClass:%@",result);
objc_getRequiredClass(获取指定的类定义)

//参数:类的名称 
//返回:类Class
 id result = objc_getMetaClass([@"ViewController" 
UTF8String]); 
NSLog(@"objc_getMetaClass:%@",result);
objc_getMetaClass(获取指定的类的元类定义)

Working with Instance Variables(使⽤实例变量)

Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]); 
//参数:Ivar 
//返回:实例变量的名称
 const char *result = ivar_getName(ivar); 
NSLog(@"lg_ivar_getName:%@",[NSString stringWithUTF8String:result]);
ivar_getName(获取实例变量名称)

Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]); 
//参数:Ivar
 //返回:实例变量的类型
 const char *result = ivar_getTypeEncoding(ivar); 
NSLog(@"lg_ivar_getTypeEncoding:%@",[NSString stringWithUTF8String:result]);
ivar_getTypeEncoding(获取实例变量的类型)

Ivar ivar = class_getInstanceVariable(self.class, [@"_logic" UTF8String]); 
//参数:Ivar 
//返回:实例变量的类型
 ptrdiff_t result = ivar_getOffset(ivar); 
NSLog(@"lg_ivar_getOffset:%td",result);
ivar_getOffset(获取实例变量的偏移量)

Associative References(关联引⽤)

/** 
policy:关联策略。有五种关联策略。 
OBJC_ASSOCIATION_ASSIGN 等价于 @property(assign)。 
OBJC_ASSOCIATION_RETAIN_NONATOMIC等价于 @property(strong, nonatomic)。 
OBJC_ASSOCIATION_COPY_NONATOMIC等价于@property(copy, nonatomic)。 
OBJC_ASSOCIATION_RETAIN等价于@property(strong,atomic)。 
OBJC_ASSOCIATION_COPY等价于@property(copy, atomic)。
 */ 
//参数:1.要关联的对象 2.全局唯⼀KEY 3.关联的obj 4.关联策略policy 
objc_setAssociatedObject(self, [@"LGKey" UTF8String], @"123456", 
OBJC_ASSOCIATION_COPY_NONATOMIC);
objc_setAssociatedObject(设置关联)

//参数:1.关联的对象 2.key 
//返回:关联的值 
id result = objc_getAssociatedObject(self, [@"LGKey" UTF8String]); 
NSLog(@"lg_objc_getAssociatedObject:%@",result);
objc_getAssociatedObject(获取关联的值)

//参数:关联的对象objc_removeAssociatedObjects(self);
objc_removeAssociatedObjects(删除关联)

Sending Messages(发送消息)

向类的实例发送带有简单返回值的消息  objc_msgSend

将带有浮点返回值的消息发送到类的实例  objc_msgSend_fpret

将带有数据结构返回值的消息发送到类的实例  objc_msgSend_stret

将带有简单返回值的消息发送到类实例的超类  objc_msgSendSuper

将带有数据结构返回值的消息发送到类实例的超类  objc_msgSendSuper_stret

Working with Methods(使⽤⽅法)

调⽤⽅法    
method_invoke

调⽤返回值为结构体的⽅法
method_invoke_stret

method_getName(获取⽅法的名称)
Method method = class_getInstanceMethod(self.class, @selector(lg_method)); 
//参数:Mothod
 //返回:SEL指针 
SEL result = method_getName(method); 
NSLog(@"lg_method_getName:%p",result);


method_getImplementation(获取⽅法的实现)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
 //参数:Mothod 
//返回:IMP指针
 IMP result = method_getImplementation(method); 
NSLog(@"lg_method_getImplementation:%p",result);


method_getTypeEncoding)(获取描述⽅法的参数和返回值类型的字符串
Method method = class_getInstanceMethod(self.class, @selector(lg_method)); 
//参数:Method 
//返回:描述⽅法的参数和返回值类型的字符串 
const char *result = method_getTypeEncoding(method); 
NSLog(@"lg_method_getTypeEncoding:%@",[NSString stringWithUTF8String:result]);


(获取⽅法的返回值类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method)); 
//参数:Method 
//返回:⽅法的返回值类型
 char *result = method_copyReturnType(method); 
NSLog(@"lg_method_copyReturnType:%@",[NSString stringWithUTF8String:result]);
method_copyReturnType

method_copyArgumentType(获取⽅法的单个参数类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method)); 
//参数:1.Method 2.unsigned int参数索引 
//返回:参数类型 
char *result = method_copyArgumentType(method, 0); 
NSLog(@"lg_method_copyReturnType:%@",[NSString stringWithUTF8String:result]); 
free(result);


method_getReturnType(获取⽅法的返回值类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
 //参数:1.Method 2.char数组 3.char数组的⻓度 
char result[10]; 
method_getReturnType(method,result,sizeof(result)); 
NSLog(@"lg_method_getReturnType:%@",[NSString stringWithUTF8String:result]);

method_getNumberOfArguments(获取⽅法参数的数量)
Method method = class_getInstanceMethod(self.class, @selector(lg_method)); 
//参数:Method 
//返回:参数的个数 
unsigned int result = method_getNumberOfArguments(method); 
NSLog(@"lg_method_getNumberOfArguments:%d",result);

method_getArgumentType(获取单个参数的类型)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
 char result[10];
 //参数:1.Method 2.参数索引 3.char数组 4.char数组的⻓度 
method_getArgumentType(method, 0, result, sizeof(result)); 
NSLog(@"lg_method_getArgumentType:%@",[NSString stringWithUTF8String:result]);

method_getDescription(获取⽅法的结构体)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
 //参数:Method
 //返回:⽅法的结构体 
struct objc_method_description *result = method_getDescription(method); 
NSLog(@"lg_method_getDescription:%p",result);

method_setImplementation(设置⽅法的实现)
Method method = class_getInstanceMethod(self.class, @selector(lg_method));
IMP imp = class_getMethodImplementation(self.class, @selector(lg_method1)); 
//参数:1.Method 2.IMP
 //返回:⽅法的先前实现 
IMP result = method_setImplementation(method, imp); 
NSLog(@"lg_method_setImplementation:%p",result); result(); 
[self lg_method];

method_exchangeImplementations(交换俩个⽅法的实现)
Method method1 = class_getInstanceMethod(self.class, @selector(lg_method1)); 
Method method2 = class_getInstanceMethod(self.class, @selector(lg_method2)); 
//参数:Method 
method_exchangeImplementations(method1, method2); 
[self lg_method1];
[self lg_method2];

Working with Properties(使⽤属性)

property_getName(获取属性的名称)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]); 
//参数:objc_property_t 
//返回:属性的名称 
const char *result = property_getName(t); 
NSLog(@"lg_property_getName:%@",[NSString stringWithUTF8String:result]);

property_getAttributes(获取属性的属性)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]);
 //参数:objc_property_t
 //返回:属性的属性
 const char *result = property_getAttributes(t); 
NSLog(@"lg_property_getAttributes:%@",[NSString stringWithUTF8String:result]);

property_copyAttributeValue(获取属性的指定属性的值)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]);
 //参数:1.objc_property_t 2.属性的属性
 //返回:属性的属性的值
 char *result = property_copyAttributeValue(t, [@"T" UTF8String]); 
NSLog(@"lg_property_copyAttributeValue:%@",[NSString stringWithUTF8String:result]);

property_copyAttributeList(获取属性的属性列表)
objc_property_t t = class_getProperty(self.class, [@"logic" UTF8String]); 
unsigned int count = 0; 
//参数:1.objc_property_t 2.unsigned int *
 //返回:属性的属性列表 
objc_property_attribute_t *result = property_copyAttributeList(t, &count); 
for (int i = 0; i < count; i ++) { 
objc_property_attribute_t t = result[i]; 
NSLog(@"lg_property_copyAttributeList:%@",[NSString stringWithUTF8String:t.name]);
 }

Using Objective-C Language Features(使⽤OC语⾔特性)

objc_enumerationMutation(检测到突变时,编译器将插⼊次函数 并且调⽤
objc_setEnumerationMutationHandler设置的回调函数,如果没有设置,则会崩溃)
//参数:idobjc_enumerationMutation(self);

objc_setEnumerationMutationHandler(设置突变处理函数)
/参数:函数指针
objc_setEnumerationMutationHandler(enumerationMutationHandler);

imp_implementationWithBlock(通过block获取⼀个⽅法的实现)
void (^blcok) (NSString *) = ^(NSString *str) { 
NSLog(@"lg_imp_implementationWithBlock"); 
}; 
//参数:block 
//返回:IMP
 IMP result = imp_implementationWithBlock(blcok); result();

imp_getBlock(通过IMP获取Block)
void (^blcok) (NSString *) = ^(NSString *str) { 
NSLog(@"lg_imp_implementationWithBlock:%@",str);
 }; 
//参数:IMP 
//返回:block 
void (^result) (NSString *) = imp_getBlock(imp_implementationWithBlock(blcok)); 
result(@"hello word");

imp_removeBlock(解除IMP与Block关联)
//参数:IMP 
//返回:BOOL 
BOOL result = imp_removeBlock(class_getMethodImplementation(self.class, NSSelectorFromString(@"lg_method"))); 
NSLog(@"lg_imp_removeBlock:%d",result);

objc_loadWeak
该函数加载⼀个弱指针引⽤的对象,并在对其做retain和autoreleasing操作后返回它。这样,对象就可以在调⽤者使⽤它时保持⾜够⻓的⽣命周期。该函数典型的⽤法是在任何有使⽤__weak变量的表达式中使⽤

objc_storeWeak
该函数的典型⽤法是⽤于__weak变量做为赋值对象时

Working with Classes(操作类)

class_getName(获取类的名称)
//参数:类Class
//返回:类Class Class result = 
class_getSuperclass([ViewController class]); 
NSLog(@"lg_class_getName:%@",result);

class_getSuperclass(获取⽗类)
//参数:类Class 
//返回:⽗类Class
 Class result = class_getSuperclass([ViewController class]); 
NSLog(@"lg_class_getName:%@",result);

class_isMetaClass(判断类是否是元类)
//参数:类Class 
//返回:BOOL类型 
BOOL result = class_isMetaClass([ViewController class]); 
NSLog(@"lg_class_isMetaClass:%d",result);

class_getInstanceSize(获取类的实例⼤⼩)
//参数:类Class
 //返回:类的实例⼤⼩
 size_t result = class_getInstanceSize([ViewController class]); 
NSLog(@"lg_class_getInstanceSize:%zu",result);

class_getInstanceVariable(获取类中指定的实例变量的信息的数据结构的指针)
//参数:类Class 实例变量的名称 
//返回:Ivar指针 
const char *result1 = [@"_logic" UTF8String];
 Ivar result2 = class_getInstanceVariable([self class], result1); 
NSLog(@"lg_class_getInstanceVariable:%p",result2);

class_getClassVariable(获取类中指定的类变量的信息的数据结构的指针)
//参数:1.类Class 2.类变量名称 
//返回:指定的类变量的信息的数据结构的指针 
Ivar ivar = class_getClassVariable(self.class, [@"isa" UTF8String]); 
NSLog(@"lg_class_getClassVariable:%p",ivar);

class_addIvar(向类添加新的实例变量)
Class CreatClass0 = objc_allocateClassPair([NSObject class], "CreatClass0", 0); 
class_addIvar(CreatClass0, "_attribute0", sizeof(NSString *), log(sizeof(NSString *)), "i"); 
Ivar ivar = class_getInstanceVariable(CreatClass0, "_attribute0"); 
NSLog(@"lg_class_addIvar:%@",[NSString stringWithUTF8String:ivar_getName(ivar)]); objc_registerClassPair(CreatClass0);
不⽀持向现有类添加实例变量

class_copyIvarList(获取类的实例变量列表)
//⼊参:1、类Class 2、unsigned int类型
 //返回:Ivar 类型的指针数组
 unsigned int copyIvarListCount = 0; 
Ivar *ivars = class_copyIvarList([self class], &copyIvarListCount);
 for (NSInteger i = 0; i< copyIvarListCount; i ++) {
 Ivar ivar = ivars[i]; 
const char *name = ivar_getName(ivar); 
NSLog(@"lg_class_copyIvarList:%s",name); 
} 
free(ivars);//释放

class_getIvarLayout(获取类的布局描述)
//参数:类Class 
//返回:返回值是指向 uint8_t 的指针 
const uint8_t *result = class_getIvarLayout(self.class); 
NSLog(@"lg_class_getIvarLayout:%p",result);

class_setIvarLayout(设置类的实例变量的修饰符)
uint8_t u = 1;
 const uint8_t *u8 = &u;
//参数:1.类Class 2.const uint8_t * 
class_setIvarLayout(self.class, u8);

class_getWeakIvarLayout(获取类的weak修饰的实例变量)
//参数:类Class 
//返回:返回值是指向 uint8_t 的指针 
const uint8_t *result = class_getWeakIvarLayout(self.class); 
NSLog(@"lg_class_getIvarLayout:%p",result);

class_setWeakIvarLayout(设置类的实例变量的修饰符为weak)
uint8_t u = 1; 
const uint8_t *u8 = &u;
//参数:1.类Class 2.const uint8_t * 
class_setWeakIvarLayout(self.class, u8);

class_getProperty(获取指定的属性)
//参数:1.类Class 2.属性名
 //返回:属性objc_property_t 
objc_property_t result = class_getProperty(self.class, [@"logic" UTF8String]); 
NSLog(@"lg_class_getProperty:%p",result);

class_copyPropertyList(获取整个属性列表)
//参数:1.类Class 2.unsigned int类型
 //返回:属性列表
 unsigned int copyPropertyListCount = 0; 
objc_property_t *propertys = class_copyPropertyList([self class], &copyPropertyListCount); 
for (NSInteger i = 0; i < copyPropertyListCount; i++) { 
objc_property_t property = propertys[i]; 
const char *name = property_getName(property); 
NSLog(@"lg_class_copyPropertyList:%s",name); 
}
 free(propertys);//释放

class_addMethod(给类添加⽅法)
 //参数:1.类Class 2.⽅法名 3.imp,函数实现 4.⽅法参数类型描述
 //返回值:BOOL
 BOOL result = class_addMethod(self.class, 
NSSelectorFromString(@"lgMethod"), [self 
methodForSelector:@selector(lg_method)], "@@:"); 
NSLog(@"lg_addMethod:%d",result);

class_getInstanceMethod(获取类的实例⽅法)

//参数:1.类Class 2.⽅法名SEL 
//返回:method结构体指针 
Method result = class_getInstanceMethod(self.class, @selector(lg_method)); 
NSLog(@"lg_class_getInstanceMethod:%p",result);

class_getClassMethod(获取类⽅法)
//⼊参:1.类Class 2.⽅法名SEL 
//返回:method结构体指针 
Method result = class_getClassMethod(self.class, @selector(lgClassMethod)); 
NSLog(@"lg_class_getClassMethod:%p",result);

class_copyMethodList(获取整个类的实例⽅法)
//参数:1、类Class 2、unsigned int 类型 
//返回:整个类的实例⽅法 
unsigned int copycopyMethodListCount = 0; 
Method *methods = class_copyMethodList([self class], &copycopyMethodListCount); for (NSInteger i = 0; i < copycopyMethodListCount; i++) { Method method = methods[i]; SEL name = method_getName(method); 
NSLog(@"lg_class_copyMethodList:%@",NSStringFromSelector(name)); } 
free(methods);//释放

class_replaceMethod(交换⽅法)
[self lg_method1]; 
//参数:1.类Class 2.⽅法名SEL 3.⽅法的实现IMP 4.⽅法参数描述 
//返回:BOOL 
BOOL result = class_replaceMethod([self class], @selector(lg_method1), [self methodForSelector:@selector(lg_method2)], NULL); 
NSLog(@"lg_class_replaceMethod:%d",result);
 [self lg_method1];

class_getMethodImplementation(获取⽅法实现)
//参数:1.类Class 2.⽅法名SEL
 //返回:⽅法实现IMP 
IMP result = class_getMethodImplementation([ViewController class], @selector(lg_method)); 
result();

class_getMethodImplementation_stret 
not available in arm64,跟class_getMethodImplementation⽅法⼀样的

class_respondsToSelector(判断是否响应⽅法)
//参数:1.类Class 2.⽅法名SEL 
/返回:BOOL 
BOOL result = class_respondsToSelector(self.class, @selector(viewDidLoad)); 
NSLog(@"lg_class_respondsToSelector:%d",result);

class_addProtocol(向类添加协议)
//参数:1.类Class 2.协议 
//返回:BOOL 
BOOL result = class_addProtocol([self class], 
NSProtocolFromString(@"UITableViewDelegate")); 
NSLog(@"lg_class_addProtocol:%d",result);

class_addProperty(为类添加属性)
objc_property_attribute_t type = { "T", "@\"NSString\"" }; 
objc_property_attribute_t ownership = { "C", "" }; // C = copy 
objc_property_attribute_t backingivar = { "V", "_attribute0" }; 
objc_property_attribute_t attrs[] = { type, ownership, backingivar }; 
//参数:1.类Class 2.属性数组 3.属性个数 
//返回值:BOOL 
BOOL suc0 = class_addProperty(self.class, "_attribute0", attrs, 3);  
SEL getter = NSSelectorFromString(@"attribute0"); 
SEL setter = NSSelectorFromString(@"setAttribute0:"); 
BOOL suc1 = class_addMethod(self.class, getter, (IMP)attribute0Getter, "@@:");
 BOOL suc2 = class_addMethod(self.class, setter, (IMP)attribute0Setter, "v@:@"); 
NSLog(@"lg_class_addProperty:class_addProperty = %d,class_addMethod_Getter = %d,class_addMethod_Setter = %d",suc0,suc1,suc2);

class_replaceProperty(替换类的属性)
objc_property_attribute_t type = { "T", "@\"NSString\"" }; 
objc_property_attribute_t ownership = { "C", "" }; // C = copy 
objc_property_attribute_t backingivar = { "V", "_attribute0" }; 
objc_property_attribute_t attrs[] = { type, ownership, backingivar }; 
//参数:1.类Class 2.属性名称 3.属性的相关属性 4.属性的相关属性的个数 
class_replaceProperty(self.class, [@"logic" UTF8String], attrs, 3);

class_conformsToProtocol(判断是否遵循某个协议)
//参数:1.类Class 2.协议
 //返回:BOOL 
BOOL result = class_conformsToProtocol(self.class, 
NSProtocolFromString(@"UITableViewDelegate")); 
NSLog(@"lg_class_conformsToProtocol:%d",result);

class_copyProtocolList(获取协议列表)
//⼊参:1、类Class 2、unsigned int 类型 
//返回:整个类的遵循的协议 
unsigned int copyProtocolListCount = 0;
 Protocol * __unsafe_unretained *protocals = class_copyProtocolList([self class], &copyProtocolListCount); 
for (NSInteger i = 0; i < copyProtocolListCount; i++) { 
Protocol * protocal = protocals[i]; 
const char *name = protocol_getName(protocal); 
NSLog(@"lg_class_copyProtocolList:%s",name); 
}
 free(protocals);//释放

class_getVersion( 获取类的版本号)
//参数:类Class 
//返回:版本号
int result = class_getVersion(self.class); 
NSLog(@"lg_class_getVersion:%d",result);

class_setVersion(设置类的版本号)
 //参数:1.类Class 2.int class_setVersion(self.class, 100);

objc_getFutureClass不要⾃⼰调⽤这个函数

objc_setFutureClass不要⾃⼰调⽤这个函数

Adding Classes(添加类)

objc_allocateClassPair(添加⼀个新类)
//参数:1.新添加类的⽗类 2.新类的名称 3.填0 
//返回:新类 
Class result = objc_allocateClassPair([NSObject class], [@"NewClass" UTF8String], 0); 
NSLog(@"lg_objc_allocateClassPair:%p",result);

objc_disposeClassPair(销毁⼀个类)
//参数:类Class 
objc_disposeClassPair(result);

objc_registerClassPair(注册使⽤类)
Class result = objc_allocateClassPair([NSObject class], [@"NewClass" UTF8String], 0); 
//参数:类Class 
objc_registerClassPair(result);

objc_duplicateClass
不要⾃⼰调⽤这个函数

nstantiating Classes(实例化类)

class_createInstance(类实例化)
//参数:1.类Class 2.额外分配的字节数 
//返回:类的实例 
NSObject *result = class_createInstance([NSObject class], 0); 
NSLog(@"lg_class_createInstance:%@",result);

objc_constructInstanceARC模式下不可⽤

objc_destructInstanceARC模式下不可⽤

Working with Libraries(使⽤库)

objc_copyImageNames(获取所有objc的框架和动态库)
 unsigned int a = 0;
 //参数:unsigned int *
 //返回:C字符串数组
 const char **result = 
objc_copyImageNames(&a); for (int i = 0; i < a; i ++) { const char *c = result[i]; 
NSLog(@"lg_objc_copyImageNames:%@",[NSString stringWithUTF8String:c]); 
}

class_getImageName(获取类源⾃的动态库的名称)
//参数:类Class 
//返回:源⾃的动态库的名称 
const char *result = class_getImageName(self.class); 
NSLog(@"lg_class_getImageName:%@",[NSString stringWithUTF8String:result]);

objc_copyClassNamesForImage(获取指定库或框架中的所有类的名称)
unsigned int outCount = 0; 
Dl_info info; 
dladdr(&_mh_execute_header, &info); 
//参数:1.库或者框架 2.unsigned int *
 //返回:指定库或框架中的所有类的名称 
const char **result = objc_copyClassNamesForImage(info.dli_fname, &outCount); 
for (int i = 0; i < outCount; i ++) { const char *c = result[i]; 
NSLog(@"lg_objc_copyClassNamesForImage:%@",[NSString stringWithUTF8String:c]);
 }

Working with Selectors(使⽤选择器)

sel_getName(获取⽅法的名称)
SEL sel = NSSelectorFromString(@"lg_method"); 
//参数:SEL
 //返回:⽅法的名称 
const char *result = sel_getName(sel); 
NSLog(@"lg_sel_getName:%@",[NSString stringWithUTF8String:result]);

sel_registerName(注册⽅法)
//参数:const char *
 //返回:SEL 
SEL result = sel_registerName([@"lglglg" UTF8String]); 
NSLog(@"lg_sel_registerName:%p",result);

sel_isEqual(判断俩个选择器是否相等)
SEL sel1 = NSSelectorFromString(@"lg_method1"); 
SEL sel2 = NSSelectorFromString(@"lg_method2"); 
//参数:SEL 
//返回:BOOL 
BOOL result = sel_isEqual(sel1, sel2); 
NSLog(@"lg_sel_isEqual:%d",result);

Working with Protocols(使⽤协议)

objc_getProtocol(获取指定的协议)
//参数:协议名称 
//返回:协议 
Protocol *result = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
NSLog(@"lg_objc_getProtocol:%@",result);

objc_copyProtocolList(获取所有的协议列表)
unsigned int count = 0; 
//参数:unsigned int * 
//返回:所有的协议列表 
Protocol __unsafe_unretained **result = objc_copyProtocolList(&count); for (int i = 0; i < count; i ++) { 
Protocol *pro = result[i]; 
NSLog(@"lg_objc_copyProtocolList:%@",pro); }

objc_allocateProtocol(创建协议)
//参数:协议的名称 
//返回:协议 
Protocol *result = objc_allocateProtocol([@"LGProtocol" UTF8String]); 
NSLog(@"lg_objc_allocateProtocol:%@",result);

objc_registerProtocol(注册协议)
Protocol *result = objc_allocateProtocol([@"LGProtocol" UTF8String]); 
//参数:协议Protocol 
objc_registerProtocol(result);

protocol_addMethodDescription(向协议添加新⽅法)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
//参数:1.协议Protocol 2.SEL 3.⽅法名称 4.是否为协议必须⽅法 5.是否为实例⽅法 
protocol_addMethodDescription(pro, NSSelectorFromString(@"lg_method"), [@"lgProtocolMethod" UTF8String], YES, YES);

protocol_addProperty(向协议添加属性)
Protocol *pro = objc_allocateProtocol([@"LGProtocol" UTF8String]); 
objc_property_attribute_t type = { "T", "@\"NSString\"" }; 
objc_property_attribute_t ownership = { "C", "" }; // C = copy 
objc_property_attribute_t backingivar = { "V", "_logic" }; 
objc_property_attribute_t attrs[] = { type, ownership, backingivar }; 
//参数:1.协议Protocol 2.属性的名称 3.属性的属性 4.属性的属性的个数 5.是否为协议的必须⽅法 6.填YES protocol_addProperty(pro, [@"logic" UTF8String], attrs, 3, YES, YES);

protocol_getName(获取协议的名称)Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
//参数:协议Protocol 
//返回:协议名称
 const char *result = protocol_getName(pro); 
NSLog(@"lg_protocol_getName:%@",[NSString stringWithUTF8String:result]);

protocol_isEqual(判断俩个协议是否相等)
Protocol *pro1 = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
 Protocol *pro2 = objc_getProtocol([@"UITableViewDataSource" UTF8String]); 
//参数:Protocol 
//返回:BOOL 
BOOL result = protocol_isEqual(pro1, pro2); 
NSLog(@"lg_protocol_isEqual:%d",result);

protocol_copyMethodDescriptionList(获取满⾜条件的协议的⽅法列表)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); unsigned int count = 0; 
//参数:1.Protocol 2.是否为必须⽅法 3.是否为实例⽅法 4.unsigned int * struct objc_method_description *result = protocol_copyMethodDescriptionList(pro, NO, YES, &count); for (int i = 0; i < count; i ++) { 
struct objc_method_description des = result[i]; 
NSLog(@"lg_protocol_copyMethodDescriptionList:%p",des.name); 
}

protocol_getMethodDescription(获取协议中指定⽅法的描述结构体)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
//参数:1.Protocol 2.SEL 3.是否为必须⽅法 4.是否为实例⽅法
 struct objc_method_description result = protocol_getMethodDescription(pro, 
NSSelectorFromString(@"tableView:willDisplayCell:forRowAtIndexPath:"), NO, YES); 
NSLog(@"lg_protocol_getMethodDescription:%p",result.name);

protocol_copyPropertyList(获取协议的属性列表)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
unsigned int count = 0; 
//参数:1.Protocol 2.unsigned int * 
//返回:协议的属性列表 
objc_property_t *result = protocol_copyPropertyList(pro, &count); for (int i = 0; i < count; i ++) { 
objc_property_t t = result[i]; 
NSLog(@"lg_protocol_copyPropertyList:%p",t);  
}

protocol_getProperty(获取协议中指定的属性)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]);
 //参数:1.Protocol 2.属性名称 3.是否为必须⽅法 4.是否为实例⽅法 
objc_property_t result = protocol_getProperty(pro, [@"" UTF8String], YES, YES); 
NSLog(@"lg_protocol_getProperty:%p",result);

protocol_copyProtocolList(获取协议中采⽤的协议列表)
Protocol *pro = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
unsigned int count = 0; 
//参数:1.Protocol 2.unsigned int * /
/返回:协议列表
 Protocol __unsafe_unretained **result = protocol_copyProtocolList(pro, &count); 
for (int i = 0; i < count; i ++) { 
Protocol *p = result[i]; 
NSLog(@"lg_protocol_copyProtocolList:%@",p); 
} 
free(result);

protocol_conformsToProtocol(判断⼀个协议是否遵循另⼀个协议)
Protocol *pro1 = objc_getProtocol([@"UITableViewDelegate" UTF8String]); 
Protocol *pro2 = objc_getProtocol([@"UIScrollViewDelegate" UTF8String]); 
//参数:Protocol 
//返回:BOOL 
BOOL result = protocol_conformsToProtocol(pro1, pro2); 
NSLog(@"lg_protocol_conformsToProtocol:%d",result);

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