PHAsset获取图片和获取视频,PHAsset转换为Data.

前言

最近做项目,使用到了PHAseet,因为ALAsset已经废弃了.实话说,PHAseet现在比ALAsset麻烦,获取地址路径就很恶心,总之,一点点也是趟过来了,做个记录,以后自己别忘了.

获取图片,获取视频首帧

        let option = PHImageRequestOptions()
        option.isNetworkAccessAllowed = true //允许下载iCloud的图片
        option.resizeMode = .fast
        option.deliveryMode = .fastFormat
        PHImageManager.default().requestImage(for: asset,
                                              targetSize: self.bounds.size,
                                              contentMode: .aspectFill,
                                              options: option)
        { (image, nil) in
             //image就是图片
        }

获取视频

       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 }
           //播放视频
           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
       })

注意事项

使用的时候,尽量将option.isNetworkAccessAllowed = true打开, 允许下载iCloud的图片和视频,否则会照成crash.这块当时给我弄的很无奈,因为我好几个地方都上传图片,改了好几遍.

将PHAsset转化为视频的NSData

我自己封装了一个简单的类,代码入下

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("视频时长 \(duration)");
        }
        
        exportSession?.exportAsynchronously(completionHandler: {
                
            switch exportSession?.status{
                
            case .failed?:
                print("失败...\(String(describing: exportSession?.error?.localizedDescription))")
                completion(Data())
                break
            case .cancelled?:
                print("取消")
                completion(Data())
                break;
            case .completed?:
                print("转码成功")
                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("视频时长\(size)")
                    completion(data)
                } catch let error {
                    print("失败 \(error)")
                    completion(Data())
                }

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

        return string//URL.init(fileURLWithPath: string)
    }
        
    //计算视频大小
    func fileSize(url:URL) -> CGFloat {
        return CGFloat(NSData.init(contentsOf: url)?.length ?? 0 )/// 1024 / 1024
    }
    
    //获取视频首帧
    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())
        }
    }
}

具体使用如下:

    //
    let options = PHVideoRequestOptions()
    options.isNetworkAccessAllowed = true
    options.deliveryMode = .automatic
                
    PHImageManager.default().requestExportSession(forVideo: mediaModel.asset, options: options, exportPreset: AVAssetExportPresetMediumQuality) { (exportSession, info) in
        //将asset转换为AVAssetExportSession对象,用AVAssetExportSession转化为Data
        XXVideoCompression().compressVideo(exportSession, completion: { (data) in
            if data.count > 0 {//做判断,判断是否转化成功
                  //进行视频上传
            }
        }
    }

具体问题具体分析,使用过程中,总会遇到各种各样的问题,但是只要有耐心,总会一点点解决的.欢迎各位留言,提问.

如果我的文章,对你有帮助,请给我一个👍哦~~!