iOS 之動態運行時 runtime <二>

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/* Working with Classes *//**  * Returns the name of a class. *  * @param cls A class object. *  * @return The name of the class, or the empty string if \e cls is \c Nil. */OBJC_EXPORT const char *class_getName(Class cls)      __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);/**  * Returns a Boolean value that indicates whether a class object is a metaclass. *  * @param cls A class object. *  * @return \c YES if \e cls is a metaclass, \c NO if \e cls is a non-meta class,  *  \c NO if \e cls is \c Nil. */OBJC_EXPORT BOOL class_isMetaClass(Class cls)      __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);/**  * Returns the superclass of a class. *  * @param cls A class object. *  * @return The superclass of the class, or \c Nil if *  \e cls is a root class, or \c Nil if \e cls is \c Nil. * * @note You should usually use \c NSObject‘s \c superclass method instead of this function. */OBJC_EXPORT Class class_getSuperclass(Class cls)      __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);/**  * Sets the superclass of a given class. *  * @param cls The class whose superclass you want to set. * @param newSuper The new superclass for cls. *  * @return The old superclass for cls. *  * @warning You should not use this function. */OBJC_EXPORT Class class_setSuperclass(Class cls, Class newSuper)      __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5,__MAC_10_5, __IPHONE_2_0,__IPHONE_2_0);/**  * Returns the version number of a class definition. *  * @param cls A pointer to a \c Class data structure. Pass *  the class definition for which you wish to obtain the version. *  * @return An integer indicating the version number of the class definition. * * @see class_setVersion */OBJC_EXPORT int class_getVersion(Class cls)    __OSX_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);/**  * Sets the version number of a class definition. *  * @param cls A pointer to an Class data structure.  *  Pass the class definition for which you wish to set the version. * @param version An integer. Pass the new version number of the class definition. * * @note You can use the version number of the class definition to provide versioning of the *  interface that your class represents to other classes. This is especially useful for object *  serialization (that is, archiving of the object in a flattened form), where it is important to *  recognize changes to the layout of the instance variables in different class-definition versions. * @note Classes derived from the Foundation framework \c NSObject class can set the class-definition *  version number using the \c setVersion: class method, which is implemented using the \c class_setVersion function. */OBJC_EXPORT void class_setVersion(Class cls, int version)    __OSX_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);/**  * Returns the size of instances of a class. *  * @param cls A class object. *  * @return The size in bytes of instances of the class \e cls, or \c 0 if \e cls is \c Nil. */OBJC_EXPORT size_t class_getInstanceSize(Class cls)      __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);

 

iOS 之動態運行時 runtime <二>