前言

最近做項(xiàng)目,使用到了PHAseet,因?yàn)锳LAsset已經(jīng)廢棄了.實(shí)話說(shuō),PHAseet現(xiàn)在比ALAsset麻煩,獲取地址路徑就很惡心,總之,一點(diǎn)點(diǎn)也是趟過(guò)來(lái)了,做個(gè)記錄,以后自己別忘了.

獲取圖片,獲取視頻首幀

        let option = PHImageRequestOptions()
        option.isNetworkAccessAllowed = true //允許下載iCloud的圖片
        option.resizeMode = .fast
        option.deliveryMode = .fastFormat
        PHImageManager.default().requestImage(for: asset,
                                              targetSize: self.bounds.size,
                                              contentMode: .aspectFill,
                                              options: option)
        { (image, nil) in
             //image就是圖片
        }

獲取視頻

       let options = PHVideoRequestOptions()
       options.isNetworkAccessAllowed = true
       options.deliveryMode = .automatic
       PHImageManager.default().requestPlayerItem(forVideo:asset, options: options, resultHandler: { playerItem, info in
           guard self.playerLayer == nil else { return }
           //播放視頻
           let player = AVPlayer(playerItem: playerItem)
           let playerLayer = AVPlayerLayer(player: player)
           playerLayer.videoGravity = AVLayerVideoGravity.resizeAspect
           playerLayer.frame = self.layer.bounds
           self.contentView.layer.insertSublayer(playerLayer, below: self.palyBtn.layer)
           player.play()
           self.playerLayer = playerLayer
       })

注意事項(xiàng)

使用的時(shí)候,盡量將option.isNetworkAccessAllowed = true打開(kāi), 允許下載iCloud的圖片和視頻,否則會(huì)照成crash.這塊當(dāng)時(shí)給我弄的很無(wú)奈,因?yàn)槲液脦讉€(gè)地方都上傳圖片,改了好幾遍.

將PHAsset轉(zhuǎn)化為視頻的NSData

我自己封裝了一個(gè)簡(jiǎn)單的類,代碼入下

import UIKit
import Photos
class XXVideoCompression: NSObject {
    
    public func compressVideo(_ exportSession:AVAssetExportSession? , completion: @escaping (_ data: Data)-> Void) {
        
        let uuu = self.compressedUrl()
        exportSession?.outputURL = URL.init(fileURLWithPath: uuu)
        exportSession?.outputFileType = .mp4
        exportSession?.shouldOptimizeForNetworkUse = true;
        
        if let assetTime = exportSession?.asset.duration {
            let duration = CMTimeGetSeconds(assetTime)
            print("視頻時(shí)長(zhǎng) \(duration)");
        }
        
        exportSession?.exportAsynchronously(completionHandler: {
                
            switch exportSession?.status{
                
            case .failed?:
                print("失敗...\(String(describing: exportSession?.error?.localizedDescription))")
                completion(Data())
                break
            case .cancelled?:
                print("取消")
                completion(Data())
                break;
            case .completed?:
                print("轉(zhuǎn)碼成功")
                do {
                    let data = try Data.init(contentsOf: URL.init(fileURLWithPath: uuu), options: Data.ReadingOptions.init())
                    let mp4Path = URL.init(fileURLWithPath: uuu)
                    let size = self.fileSize(url: mp4Path)
                    print("視頻時(shí)長(zhǎng)\(size)")
                    completion(data)
                } catch let error {
                    print("失敗 \(error)")
                    completion(Data())
                }

                break;
            default:
                print("..")
                completion(Data())
                break;
            }
        })
    }
    
    
    //保存壓縮
    func compressedUrl() -> String {
        
        let string = NSHomeDirectory() + "/Documents/\(Date().timeIntervalSince1970).mp4"

        return string//URL.init(fileURLWithPath: string)
    }
        
    //計(jì)算視頻大小
    func fileSize(url:URL) -> CGFloat {
        return CGFloat(NSData.init(contentsOf: url)?.length ?? 0 )/// 1024 / 1024
    }
    
    //獲取視頻首幀
    func imageWithVideoUrl(mediaModel:HEPhotoAsset,completion: @escaping ( _ image:UIImage) -> Void) {
        
        let option = PHImageRequestOptions()
        option.isNetworkAccessAllowed = true
        option.resizeMode = .fast
        option.deliveryMode = .fastFormat
        PHImageManager.default().requestImage(for: mediaModel.asset,
                                              targetSize:PHImageManagerMaximumSize,
                                              contentMode: .aspectFill,
                                              options: option )
        { (image, info) in
            completion(image ?? UIImage())
        }
    }
}

具體使用如下:

    //
    let options = PHVideoRequestOptions()
    options.isNetworkAccessAllowed = true
    options.deliveryMode = .automatic
                
    PHImageManager.default().requestExportSession(forVideo: mediaModel.asset, options: options, exportPreset: AVAssetExportPresetMediumQuality) { (exportSession, info) in
        //將asset轉(zhuǎn)換為AVAssetExportSession對(duì)象,用AVAssetExportSession轉(zhuǎn)化為Data
        XXVideoCompression().compressVideo(exportSession, completion: { (data) in
            if data.count > 0 {//做判斷,判斷是否轉(zhuǎn)化成功
                  //進(jìn)行視頻上傳
            }
        }
    }

具體問(wèn)題具體分析,使用過(guò)程中,總會(huì)遇到各種各樣的問(wèn)題,但是只要有耐心,總會(huì)一點(diǎn)點(diǎn)解決的.歡迎各位留言,提問(wèn).

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