Question

Xcode的新功能，试图制作一个下载动态壁纸的应用程序。我使用来自github的LivePhotoDemo来获取所有代码。我的问题是，当页面加载到页面中时，它会显示实时照片，但会在我的照片库中保存它的两个副本，而我似乎无法弄清楚如何获取保存按钮来代替它（只有一个副本）

import UIKit
import Photos
import PhotosUI
import MobileCoreServices


struct FilePaths {
static let documentsPath : AnyObject = NSSearchPathForDirectoriesInDomains(.cachesDirectory,.userDomainMask,true)[0] as AnyObject
struct VidToLive {
    static var livePath = FilePaths.documentsPath.appending("/")
}
}

class ViewController: UIViewController, 
UIImagePickerControllerDelegate, UINavigationControllerDelegate {
//@IBOutlet var livePhotoView: PHLivePhotoView!

@IBOutlet var livePhotoView: PHLivePhotoView!
    {
    didSet {
        loadVideoWithVideoURL(Bundle.main.url(forResource: "video", withExtension: "mov")!)
    }
}

func loadVideoWithVideoURL(_ videoURL: URL) {
    livePhotoView.livePhoto = nil
    let asset = AVURLAsset(url: videoURL)
    let generator = AVAssetImageGenerator(asset: asset)
    generator.appliesPreferredTrackTransform = true
    let time = NSValue(time: CMTimeMakeWithSeconds(CMTimeGetSeconds(asset.duration)/2, preferredTimescale: asset.duration.timescale))
    generator.generateCGImagesAsynchronously(forTimes: [time]) { [weak self] _, image, _, _, _ in
        if let image = image, let data = UIImage(cgImage: image).pngData() {
            let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
            let imageURL = urls[0].appendingPathComponent("image.jpg")
            try? data.write(to: imageURL, options: [.atomic])

            let image = imageURL.path
            let mov = videoURL.path
            let output = FilePaths.VidToLive.livePath
            let assetIdentifier = UUID().uuidString
            let _ = try? FileManager.default.createDirectory(atPath: output, withIntermediateDirectories: true, attributes: nil)
            do {
                try FileManager.default.removeItem(atPath: output + "/IMG.JPG")
                try FileManager.default.removeItem(atPath: output + "/IMG.MOV")

            } catch {

            }
            JPEG(path: image).write(output + "/IMG.JPG",
                                    assetIdentifier: assetIdentifier)
            QuickTimeMov(path: mov).write(output + "/IMG.MOV",
                                          assetIdentifier: assetIdentifier)

            //self?.livePhotoView.livePhoto = LPDLivePhoto.livePhotoWithImageURL(NSURL(fileURLWithPath: FilePaths.VidToLive.livePath.stringByAppendingString("/IMG.JPG")), videoURL: NSURL(fileURLWithPath: FilePaths.VidToLive.livePath.stringByAppendingString("/IMG.MOV")))
            //self?.exportLivePhoto()
            _ = DispatchQueue.main.sync {
                PHLivePhoto.request(withResourceFileURLs: [ URL(fileURLWithPath: FilePaths.VidToLive.livePath + "/IMG.MOV"), URL(fileURLWithPath: FilePaths.VidToLive.livePath + "/IMG.JPG")],
                                    placeholderImage: nil,
                                    targetSize: self!.view.bounds.size,
                                    contentMode: PHImageContentMode.aspectFit,
                                    resultHandler: { (livePhoto, info) -> Void in
                                        self?.livePhotoView.livePhoto = livePhoto
                                        self?.exportLivePhoto()
                })
            }
        }
    }
}

 @IBAction func Savephoto(_ sender: UIBarButtonItem){
  }
  func exportLivePhoto () {
    PHPhotoLibrary.shared().performChanges({ () -> Void in
        let creationRequest = PHAssetCreationRequest.forAsset()
        let options = PHAssetResourceCreationOptions()


        creationRequest.addResource(with: PHAssetResourceType.pairedVideo, fileURL: URL(fileURLWithPath: FilePaths.VidToLive.livePath + "/IMG.MOV"), options: options)
        creationRequest.addResource(with: PHAssetResourceType.photo, fileURL: URL(fileURLWithPath: FilePaths.VidToLive.livePath + "/IMG.JPG"), options: options)

    }, completionHandler: { (success, error) -> Void in
        if !success {
            NSLog((error?.localizedDescription)!)
        }
    })
}
}

我的主视图在顶部链接到IBOutlet，在底部附近将保存按钮链接到IBAction。实际上，除了几年前的HTML和C ++之外，我对编码的了解并不多。我只知道如何浏览代码并尝试理解所有内容。有人可以告诉我即时消息做错了什么，在哪里。非常感谢！

Answer 1

以下是让您摆脱困境的一些方法。

问题1：如何获取保存按钮以调用exportLivePhoto（）：

您按钮的IBAction应该看起来像这样：

  @IBAction func savePhotoTapped(_ sender: Any) {
    print("in savePhotoTapped | start"
    exportLivePhoto()
  }

确保此操作已连接到您在情节提要中创建的按钮。

问题2：多次保存：

这些行看起来就像它们保存了jpg和mov版本的图像。如果您只想发表评论。

try FileManager.default.removeItem(atPath: output + "/IMG.JPG")
try FileManager.default.removeItem(atPath: output + "/IMG.MOV")

也请尝试清理您的代码，以便将来更易于阅读。

自动保存实时照片

1 个答案: