Function

CFRunLoopObserverIsValid(_:)

Returns a Boolean value that indicates whether a CFRunLoopObserver object is valid and able to fire.

Declaration

func CFRunLoopObserverIsValid(_ observer: CFRunLoopObserver!) -> Bool

Parameters

observer

The run loop observer to examine.

Return Value

true if observer is valid, otherwise false.

Discussion

A nonrepeating observer is automatically invalidated after it is called once.

See Also

CFRunLoopObserver Miscellaneous Functions

func CFRunLoopObserverDoesRepeat(CFRunLoopObserver!) -> Bool

Returns a Boolean value that indicates whether a CFRunLoopObserver repeats.

func CFRunLoopObserverGetActivities(CFRunLoopObserver!) -> CFOptionFlags

Returns the run loop stages during which an observer runs.

func CFRunLoopObserverGetOrder(CFRunLoopObserver!) -> CFIndex

Returns the ordering parameter for a CFRunLoopObserver object.

func CFRunLoopObserverGetTypeID() -> CFTypeID

Returns the type identifier for the CFRunLoopObserver opaque type.

func CFRunLoopObserverInvalidate(CFRunLoopObserver!)

Invalidates a CFRunLoopObserver object, stopping it from ever firing again.