Instance Method export Asynchronously(completion Handler:)
Starts the asynchronous execution of an export session.
iOS 4.0+ macOS 10.7+ Mac Catalyst 13.0+ Beta tvOS 9.0+ Declaration func exportAsynchronously( completionHandler handler: @escaping () -> )
A block that is invoked when writing is complete or in the event of writing failure.
This method starts an asynchronous export operation and returns immediately.
signals the terminal state of the export session, and if a failure occurs, status describes the problem. error
If internal preparation for export fails,
is invoked synchronously. The handler may also be called asynchronously, after the method returns, in the following cases:
If a failure occurs during the export, including failures of loading, re-encoding, or writing media data to the output.
is invoked. cancel Export()
After the export session succeeds, having completely written its output to the
. output URL
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