swift和CMTimeMake

Question

我尝试捕获视频:https:
//developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html#//apple_ref/doc/uid/TP40010188-CH5-SW26

var maxDuration : CMTime = CMTimeMake(seconds, preferredTimeScale)
aMovieFileOutput.maxRecordedDuration = CMTimeMake(seconds, preferredTimeScale)

1行有错误:使用模块'CMTime'作为类型
2行有错误:使用未解析的标识符'CMTimeMake'

我做错了什么？

Answer 1

CMTime并且CMTimeMake在"CoreMedia"模块中定义,因此您必须这样做

import CoreMedia

然后编译没有问题:

let seconds : Int64 = 10
let preferredTimeScale : Int32 = 1
let aMovieFileOutput = AVCaptureMovieFileOutput()
let maxDuration : CMTime = CMTimeMake(seconds, preferredTimeScale)
aMovieFileOutput.maxRecordedDuration = maxDuration

Swift 3更新:

let maxDuration = CMTime(seconds: Double(seconds), preferredTimescale: 1)