iOS Swift4.0 音频的剪辑,裁剪

Swift 4.0 音频编辑

• 废话不多说直接上代码

1.创建工程导入AVFoundation头文件//必须的

import UIKit
import AVFoundation

2.开始干活

override func viewDidLoad() {
    super.viewDidLoad()
    //裁剪音频
    seeMuisc()
    // Do any additional setup after loading the view, typically from a nib.
}
func seeMuisc() {
    //找到本地文件所在的目录地址
    let filePathFive = Bundle.main .path(forResource: "five", ofType: "mp3")
    //开始裁剪
    audioCrop(url: NSURL.fileURL(withPath: filePathFive!) as NSURL, startTime: CMTime.init(value: 0, timescale: 1), endTime: CMTime.init(value: 88, timescale: 1))
    
}
func audioCrop(url:NSURL ,startTime:CMTime ,endTime:CMTime) {
    //拼接输出地址
    let outPath = composeDir() + "fiveM.m4a"
    //输出地址
    let audioFileOutput = URL.init(fileURLWithPath: outPath)
    do {
        //如果有与该文件同名的删除
        try FileManager.default.removeItem(at: audioFileOutput)
    } catch  {
        
    }
    //取出本地的数据
    let asset = AVAsset(url: url as URL)
    //开始裁剪
    let exportSession = AVAssetExportSession.init(asset: asset, presetName: AVAssetExportPresetAppleM4A)
    let exportTimeRange = CMTimeRangeMake(startTime, endTime)
    exportSession?.outputFileType = AVFileType.m4a
    exportSession?.outputURL = audioFileOutput
    exportSession?.timeRange = exportTimeRange
    exportSession?.exportAsynchronously(completionHandler: {
        if AVAssetExportSessionStatus.completed == exportSession?.status {
            print("\(outPath)")
        }else if AVAssetExportSessionStatus.failed == exportSession?.status {
            print("\(String(describing: exportSession?.error?.localizedDescription))")
        }
    })
    
}
func composeDir() -> (String)  {
    //获取本地存储的地址
    let cacheDir = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.cachesDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
    let fileManage = FileManager.default
    let composeDir =  cacheDir[0] + "/MMMMM/"
    let existed = fileManage.fileExists(atPath: composeDir)
    if existed == false {
        do {
            try fileManage.createDirectory(atPath: composeDir, withIntermediateDirectories: true, attributes: nil)
        }catch{

        }
        
    }
    return composeDir
    

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

Warning !音频文件自己直接拖到工程命名一致就行.代码拷贝过去可直接运行