value(forOutputKey:ofType:)

Returns the current value on an output port (identified by its key) of the root patch of the composition.

Declaration

func value(forOutputKey key: String!, ofType type: String!) -> Any!

key:
The key associated with an output port for the root patch of a composition. This method throws an exception if key is invalid.
type:
A string that specifies the class.

The value.

The value type depends on the type of the port type, as shown in the following table

Port type	Value type
Boolean, Index, or Number	Nsnumber or any object that responds to the methods `integerValue`, `floatValue`, or `doubleValue`
String	Nsstring or any object that responds to the methods`stringValue` or `description`
Color	Nscolor, Cicolor, or `CGColor` object
Image	Nsimage, Nsbitmapimagerep, `CGImage` object, Ciimage, `CVPixelBuffer` object, `CVOpenGLBuffer` object, or an opaque `QCImage` (that is, an optimized abstract image object only to be used with `setValue:forInputKey:` of another `<QCCompositionRenderer>`)
Structure	Nsarray or Nsdictionary