runtime概念
- 一套比較底層的c語言API，包含了很多c語言函數，平時所寫的OC代碼，在運行過程中，其實轉成了runtime的c語言代碼！runtime算是OC的幕后工作者。
作用：
- runtime屬于OC的底層實現，可以進行一些非常底層的操作，甚至是OC不能完成的。
- 利用runtime在程序運行過程中，動態(tài)的創(chuàng)建一個類（KVO底層實現）。
- 利用runtime在程序運行過程中，動態(tài)的為某一個類添加修改 屬性\方法。
- 遍歷出一個類的所有成員變量和成員方法！
runtime類相關的方法
typedef struct objc_method * Method;
typedef struct objc_ivar * Ivar;
typedef struct objc_category * Category;
typedef struct objc_property * objc_property_t;
struct objc_class {
Class isa
#if ! _ _OBJC2 _ _
Class super_class
const char * name
long version
long info
long instance_size
struct objc_ivar_list * ivars
struct objc_method_list **methodLists
struct objc_cache * cache
struct objc_protocol_list *protocols
#endif
}
typedef struct objc_object Protocol;
struct objc_method_description {
SEL namel;
char * types;
}
typedef struct { // Defines a property attribute
const char *name;
const char * value;
}objc_property_attribute_t;
Class object_getClass (id obj);
Class object_setClass (id obj , Class cls);
BOOL object_isClass (id obj);
id object_getIvar(id obj , Ivar ivar);
void object_setIvar(id obj , Ivar ivar , id value);
void_setIvarWithStrongDefault(id obj , Ivar ivar, id value);
Class object_getClass(const char *name);
Class object_getMetaClass(const char * name);
Class objc_lookUpClass(const char* name);
Class objc_getRequiredClass(const char *name);
int objc_getClassList(Class * buffer, int bufferCount);
class * objc_copyClassList (unsigned int *outCount)
const char * class_getName(Class cls);
BOOL class_isMetaClass(Class cls);
Class class_getSuperclass(Class cls);
int class_getVersion(Class cls);
void class_setVersion(Class cls ,int version);
size_t class_getInstanceSize(Class cls);
Ivar class_getInstanceVariable(Class cls, const char*name)
Ivar class_getClassVariable(Class cls ,const char *name)
Ivar *class_copyIvarList(Class cls ,unsigned int *outCount)
Method class_getinstanceMethod(Class cls , SEL name)
Method class_getClassMethod(Class cls ,SEL name)
IMP class_getMethodImplementation(Class cls, SEL name)
BOOL class_respondsToSelector(Class cls, SEL sel)
Method * class_copyeMethodlist(Class cls, unsigned int *outCount)
BOOL class_conformsToProtocol(Class cls ,Protocol * protocol)
Protocol * __unsafe_unretained * class_copyProtocolList (Class cls ,unsigned int *outCount)
objc_property_t class_getProperty(Class cls ,const char * name)
objc_property_t *class_copyPropertyList(Class cls ,unsigned int *outCount)
const uint8_t *class_getIvarLayout(Class cls)
const uint8_t *class_getWeakIvarLayout(Class cls)
BOOL class_addMethod(Class cls ,SEL name, IMP imp const char * types)
class_replaceMethod(Class cls ,SEL name, IMP imp, const char* types)
BOOL vlass_addIvar (Class cls, const char*name, size_t size,uint8_t alignment,const char *types)
BOOL class_addProtocol(Class cls, Protocol * protocol)
BOOL class_addProperty(Class cls ,const char *name,const objc_property_attribute_t *attributes,unsigned int attributeCount)
void class_replaceProperty(Class cls ,const char *name,const objc_property_attribute_t *attributes,unsigned int attributeCount);
void class_setIvarLayoutClass cls, const uint8_t *layout)
void class_setWeakIvarLayout(Class cls, const uint8_t *layout)
Class objc_allocateClassPair(Class superclass, const char *name, size_t extraBytes)
void objc_registerClassPair(Class cls)
Class objc_duplicateClass(Class original, const char *name, size_t extraBytes)
void objc_disposeClassPair(Class cls)
SEL method_getName(Method m)
IMP method_getImplementation(Method m)
const char * method_getTypeEncoding(Method m)
unsigned int method_getNumberOfArguments
char *method_copyReturnType(Method m)
char *method_copyArgumentType(Method m, unsigned int index)
void method_getReturnType(Method m, char *dst, size_t dst_len)
OBJC_EXPORT void method_getArgumentType(Method m, unsigned int index,
char *dst, size_t dst_len)
OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0);
OBJC_EXPORT struct objc_method_description *method_getDescription(Method m)
OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0);
IMP method_setImplementation(Method m, IMP imp)
void method_exchangeImplementations(Method m1, Method m2)
const char *ivar_getName(Ivar v)
const char *ivar_getTypeEncoding(Ivar v)
ptrdiff_t ivar_getOffset(Ivar v)
const char *property_getName(objc_property_t property)
const char *property_getAttributes(objc_property_t property)
objc_property_attribute_t *property_copyAttributeList(objc_property_t property, unsigned int *outCount)
char *property_copyAttributeValue(objc_property_t property, const char *attributeName)
Protocol *objc_getProtocol(const char *name)
Protocol * __unsafe_unretained *objc_copyProtocolList(unsigned int *outCount)
BOOL protocol_conformsToProtocol(Protocol *proto, Protocol *other)
BOOL protocol_isEqual(Protocol *proto, Protocol *other)
const char *protocol_getName(Protocol *p)
struct objc_method_description protocol_getMethodDescription(Protocol *p, SEL aSel, BOOL isRequiredMethod, BOOL isInstanceMethod)
struct objc_method_description *protocol_copyMethodDescriptionList(Protocol *p, BOOL isRequiredMethod, BOOL isInstanceMethod, unsigned int *outCount)
objc_property_t protocol_getProperty(Protocol *proto, const char *name, BOOL isRequiredProperty, BOOL isInstanceProperty)
objc_property_t *protocol_copyPropertyList(Protocol *proto, unsigned int *outCount)
objc_property_t *protocol_copyPropertyList2(Protocol *proto, unsigned int *outCount, BOOL isRequiredProperty, BOOL isInstanceProperty)
Protocol * __unsafe_unretained *protocol_copyProtocolList(Protocol *proto, unsigned int *outCount)
Protocol *objc_allocateProtocol(const char *name)
void objc_registerProtocol(Protocol *proto)
void protocol_addMethodDescription(Protocol *proto, SEL name, const char *types, BOOL isRequiredMethod, BOOL isInstanceMethod)
void protocol_addProtocol(Protocol *proto, Protocol *addition)
void protocol_addProperty(Protocol *proto, const char *name, const objc_property_attribute_t *attributes, unsigned int attributeCount, BOOL isRequiredProperty, BOOL isInstanceProperty)
const char **objc_copyImageNames(unsigned int *outCount)
const char *class_getImageName(Class cls)
const char **objc_copyClassNamesForImage(const char *image,
unsigned int *outCount)
const char *sel_getName(SEL sel)
SEL sel_registerName(const char *str)
BOOL sel_isEqual(SEL lhs, SEL rhs)
void objc_enumerationMutation(id obj)
void objc_setEnumerationMutationHandler(void (*handler)(id))
void objc_setForwardHandler(void *fwd, void *fwd_stret)
IMP imp_implementationWithBlock(id block)
id imp_getBlock(IMP anImp)
BOOL imp_removeBlock(IMP anImp)
id objc_loadWeak(id *location)
id objc_storeWeak(id *location, id obj)
typedef OBJC_ENUM(uintptr_t, objc_AssociationPolicy) {
OBJC_ASSOCIATION_ASSIGN = 0, /**< Specifies a weak reference to the associated object. */
OBJC_ASSOCIATION_RETAIN_NONATOMIC = 1, /**< Specifies a strong reference to the associated object.
* The association is not made atomically. */
OBJC_ASSOCIATION_COPY_NONATOMIC = 3, /**< Specifies that the associated object is copied.
* The association is not made atomically. */
OBJC_ASSOCIATION_RETAIN = 01401, /**< Specifies a strong reference to the associated object.
* The association is made atomically. */
OBJC_ASSOCIATION_COPY = 01403 /**< Specifies that the associated object is copied.
* The association is made atomically. */
};
void objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)
id objc_getAssociatedObject(id object, const void *key)
void objc_removeAssociatedObjects(id object)
objc_message
void objc_msgSend(void /* id self, SEL op, ... */ )
void objc_msgSendSuper(void /* struct objc_super *super, SEL op, ... */ )
id objc_msgSend(id self, SEL op, ...)
id objc_msgSendSuper(struct objc_super *super, SEL op, ...)
