如何在 Swift 中将 CMTime 转换为 NSValue？

Question

I was trying to make use of AVPlayer's addBoundaryTimeObserverForTimes method from swift and ran into a problem converting CMTimes to NSValues , which is what addBoundaryTimeObserverForTimes take as input. In the end I resorted to wrapping [NSString valueWithCMTime:] in a C function and calling it from swift, but is there a way to do it in pure swift?

Answer 1

The Swift constructor corresponding to valueWithCMTime: is NSValue(time:) :

import CoreMedia
import AVFoundation

let cmTime  = CMTimeMake(value: 10, timescale: 20) // Updated for Swift 3+
let cmValue = NSValue(time: cmTime)
// Or simply:
let cmValue = cmTime as NSValue