Function

class_getMethodImplementation(_:_:)

Returns the function pointer that would be called if a particular message were sent to an instance of a class.

Declaration

func class_getMethodImplementation(_ cls: AnyClass?, _ name: Selector) -> IMP?

Parameters

cls

The class you want to inspect.

name

A selector.

Return Value

The function pointer that would be called if [object name] were called with an instance of the class, or NULL if cls is Nil.

Discussion

class_getMethodImplementation(_:_:) may be faster than method_getImplementation(class_getInstanceMethod(cls, name)).

The function pointer returned may be a function internal to the runtime instead of an actual method implementation. For example, if instances of the class do not respond to the selector, the function pointer returned will be part of the runtime's message forwarding machinery.

See Also

Working with Classes

func class_getName(AnyClass?)

Returns the name of a class.

func class_getSuperclass(AnyClass?)

Returns the superclass of a class.

func class_isMetaClass(AnyClass?)

Returns a Boolean value that indicates whether a class object is a metaclass.

func class_getInstanceSize(AnyClass?)

Returns the size of instances of a class.

func class_getInstanceVariable(AnyClass?, UnsafePointer<Int8>)

Returns the Ivar for a specified instance variable of a given class.

func class_getClassVariable(AnyClass?, UnsafePointer<Int8>)

Returns the Ivar for a specified class variable of a given class.

func class_copyIvarList(AnyClass?, UnsafeMutablePointer<UInt32>?)

Describes the instance variables declared by a class.

func class_getIvarLayout(AnyClass?)

Returns a description of the Ivar layout for a given class.

func class_setIvarLayout(AnyClass?, UnsafePointer<UInt8>?)

Sets the Ivar layout for a given class.

func class_getWeakIvarLayout(AnyClass?)

Returns a description of the layout of weak Ivars for a given class.

func class_setWeakIvarLayout(AnyClass?, UnsafePointer<UInt8>?)

Sets the layout for weak Ivars for a given class.

func class_getProperty(AnyClass?, UnsafePointer<Int8>)

Returns a property with a given name of a given class.

func class_addMethod(AnyClass?, Selector, IMP, UnsafePointer<Int8>?)

Adds a new method to a class with a given name and implementation.

func class_getInstanceMethod(AnyClass?, Selector)

Returns a specified instance method for a given class.

func class_getClassMethod(AnyClass?, Selector)

Returns a pointer to the data structure describing a given class method for a given class.

func class_copyMethodList(AnyClass?, UnsafeMutablePointer<UInt32>?)

Describes the instance methods implemented by a class.

func class_replaceMethod(AnyClass?, Selector, IMP, UnsafePointer<Int8>?)

Replaces the implementation of a method for a given class.

func class_getMethodImplementation_stret(AnyClass?, Selector)

Returns the function pointer that would be called if a particular message were sent to an instance of a class.

func class_respondsToSelector(AnyClass?, Selector)

Returns a Boolean value that indicates whether instances of a class respond to a particular selector.

func class_conformsToProtocol(AnyClass?, Protocol?)

Returns a Boolean value that indicates whether a class conforms to a given protocol.

func class_getVersion(AnyClass?)

Returns the version number of a class definition.

func class_setVersion(AnyClass?, Int32)

Sets the version number of a class definition.