swift开发笔记15
// swift中的String和OC中的NSString转换
extension String {
var convert: NSString { return (self as NSString) }
}
var backgroundColor: UIColor = UIColor.black {
didSet {
view.backgroundColor = backgroundColor
}
}
open var duration: CGFloat = 0.0// 不同于Float
// 监听通知
NotificationCenter.default.addObserver(self, selector: #selector(VideoSpashViewController.playerItemDidReachEnd), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: moviePlayer.player?.currentItem)
// 在主线程刷新UI，播放视频
if let path = newUrl as URL? {
DispatchQueue.global().async {
DispatchQueue.main.async {
self.moviePlayer.player = AVPlayer.init(url: path)
self.moviePlayer.player?.play()
self.moviePlayer.player?.volume = Float(self.moviePlayerSoundLevel)
}
}
}
view.addSubview(moviePlayer.view)
view.sendSubview(toBack: moviePlayer.view)// 将视频播放器的view放到最前面
// 视频转码
import AVFoundation
class VideoCutter: NSObject {
open func cropVideoWithUrl(videoUrl url: URL, startTime: CGFloat, duration: CGFloat, completion: ((_ videoPath: URL?, _ error: NSError?) -> Void)?) {
DispatchQueue.global().async {
let asset = AVURLAsset.init(url: url)
let exportSession = AVAssetExportSession.init(asset: asset, presetName: "AVAssetExportPresetHighestQuality")
let paths :NSArray = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) as NSArray
var outputURL = paths.object(at: 0) as! String
let manager = FileManager.default
do {
try manager.createDirectory(atPath: outputURL, withIntermediateDirectories: true, attributes: nil)
} catch {
}
outputURL = outputURL.convert.appendingPathComponent("output.mp4")
do {
try manager.removeItem(atPath: outputURL)
} catch {}
if let exportSession = exportSession as AVAssetExportSession? {
exportSession.outputURL = URL.init(fileURLWithPath: outputURL)
exportSession.shouldOptimizeForNetworkUse = true
exportSession.outputFileType = AVFileTypeMPEG4
let start = CMTimeMakeWithSeconds(Float64(startTime), 600)
let duration = CMTimeMakeWithSeconds(Float64(duration), 600)
let range = CMTimeRangeMake(start, duration)
exportSession.timeRange = range
exportSession.exportAsynchronously { () -> Void in
switch exportSession.status {
case AVAssetExportSessionStatus.completed:
completion?(exportSession.outputURL, nil)
case AVAssetExportSessionStatus.failed:
print("Failed: (String(describing: exportSession.error))")
case AVAssetExportSessionStatus.cancelled:
print("Failed: (String(describing: exportSession.error))")
default:
print("default case")
}
}
}
DispatchQueue.main.async {
}
}
}
}