Contents

SecTransformCustomSetAttribute(_:_:_:_:)

Sets an attribute value on a custom transform.

Declaration

func SecTransformCustomSetAttribute(_ ref: SecTransformImplementationRef, _ attribute: SecTransformStringOrAttribute, _ type: SecTransformMetaAttributeType, _ value: CFTypeRef?) -> CFTypeRef?

Parameters

  • ref:

    A Sectransformimplementationref that is bound to an instance of a custom transform.

  • attribute:

    The name or the attribute handle of the attribute whose value is to be set. When using a name, see Transform Attributes for a list of valid key names.

  • type:

    The type of data to be retrieved for the attribute. See the discussion on Sectransformmetaattributetype for details.

  • value:

    The new value for the attribute

Return Value

An error on failure, or NULL on success. In Objective-C, call the CFRelease function to free the error’s memory when you are done with it.

Discussion

Unlike the SecTransformSetAttribute(_:_:_:_:) function this function can set attribute values while a transform is executing. These values are limited to the custom transform instance that is bound to the ref parameter.