我试图弄清楚，但找不到任何有用的信息。我只发现了这个：
PHAssetResourceManager.defaultManager().writeDataForAssetResource(assetRes,
toFile: fileURL, options: nil, completionHandler:
{
// Video file has been written to path specified via fileURL
}
但我很惭愧地说我不知道如何发挥它。我创建了一个 UIImagePickerController 并从相机胶卷中加载了一个图像。
使用此代码从实时照片中获取视频：
- (void)videoUrlForLivePhotoAsset:(PHAsset*)asset withCompletionBlock:(void (^)(NSURL* url))completionBlock{
if([asset isKindOfClass:[PHAsset class]]){
NSString* identifier = [(PHAsset*)asset localIdentifier];
NSString* filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mov",[NSString stringWithFormat:@"%.0f",[[NSDate date] timeIntervalSince1970]]]];
NSURL *fileUrl = [NSURL fileURLWithPath:filePath];
PHLivePhotoRequestOptions* options = [PHLivePhotoRequestOptions new];
options.deliveryMode = PHImageRequestOptionsDeliveryModeFastFormat;
options.networkAccessAllowed = YES;
[[PHImageManager defaultManager] requestLivePhotoForAsset:asset targetSize:[UIScreen mainScreen].bounds.size contentMode:PHImageContentModeDefault options:options resultHandler:^(PHLivePhoto * _Nullable livePhoto, NSDictionary * _Nullable info) {
if(livePhoto){
NSArray* assetResources = [PHAssetResource assetResourcesForLivePhoto:livePhoto];
PHAssetResource* videoResource = nil;
for(PHAssetResource* resource in assetResources){
if (resource.type == PHAssetResourceTypePairedVideo) {
videoResource = resource;
break;
}
}
if(videoResource){
[[PHAssetResourceManager defaultManager] writeDataForAssetResource:videoResource toFile:fileUrl options:nil completionHandler:^(NSError * _Nullable error) {
if(!error){
completionBlock(fileUrl);
}else{
completionBlock(nil);
}
}];
}else{
completionBlock(nil);
}
}else{
completionBlock(nil);
}
}];
}else{
completionBlock(nil);
}
}
基本上你要做的是你首先需要PHLivePhoto从你的PHAsset. 之后，您将必须遍历实时照片中的所有资产资源并检查其是否为PHAssetResourceTypePairedVideo.
如果是，你得到了你的视频。现在您需要像我在这里所做的那样将它保存到某个临时目录中，并将该文件用于您可能有的任何目的。
要播放此视频，您可以使用以下代码：
NSURL *videoURL = [NSURL fileURLWithPath:fileUrl];
AVPlayer *player = [AVPlayer playerWithURL:videoURL];
AVPlayerViewController *playerViewController = [AVPlayerViewController new];
playerViewController.player = player;
[self presentViewController:playerViewController animated:YES completion:nil];
随时询问您是否需要任何澄清。
PS-我在此方法中做了一些更改以删除我的应用程序代码的依赖关系，因此上述代码未经测试，但我觉得它应该按预期工作。
import Photos
import MobileCoreServices
// <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
@IBAction func showImagePicker(sender: UIButton) {
let picker = UIImagePickerController()
picker.delegate = self;
picker.allowsEditing = false;
picker.sourceType = .photoLibrary;
picker.mediaTypes = [kUTTypeLivePhoto as String, kUTTypeImage as String];
present(picker, animated: true, completion: nil);
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
guard
let livePhoto = info[UIImagePickerControllerLivePhoto] as? PHLivePhoto,
let photoDir = generateFolderForLivePhotoResources()
else {
return;
}
let assetResources = PHAssetResource.assetResources(for: livePhoto)
for resource in assetResources {
// SAVE FROM BUFFER
// let buffer = NSMutableData()
// PHAssetResourceManager.default().requestData(for: resource, options: nil, dataReceivedHandler: { (chunk) in
// buffer.append(chunk)
// }, completionHandler: {[weak self] error in
// self?.saveAssetResource(resource: resource, inDirectory: photoDir, buffer: buffer, maybeError: error)
// })
// SAVE DIRECTLY
saveAssetResource(resource: resource, inDirectory: photoDir, buffer: nil, maybeError: nil)
}
picker.dismiss(animated: true) {}
}
func saveAssetResource(
resource: PHAssetResource,
inDirectory: NSURL,
buffer: NSMutableData?, maybeError: Error?
) -> Void {
guard maybeError == nil else {
print("Could not request data for resource: \(resource), error: \(String(describing: maybeError))")
return
}
let maybeExt = UTTypeCopyPreferredTagWithClass(
resource.uniformTypeIdentifier as CFString,
kUTTagClassFilenameExtension
)?.takeRetainedValue()
guard let ext = maybeExt else {
return
}
guard var fileUrl = inDirectory.appendingPathComponent(NSUUID().uuidString) else {
print("file url error")
return
}
fileUrl = fileUrl.appendingPathExtension(ext as String)
if let buffer = buffer, buffer.write(to: fileUrl, atomically: true) {
print("Saved resource form buffer \(resource) to filepath \(String(describing: fileUrl))")
} else {
PHAssetResourceManager.default().writeData(for: resource, toFile: fileUrl, options: nil) { (error) in
print("Saved resource directly \(resource) to filepath \(String(describing: fileUrl))")
}
}
}
func generateFolderForLivePhotoResources() -> NSURL? {
let photoDir = NSURL(
// NB: Files in NSTemporaryDirectory() are automatically cleaned up by the OS
fileURLWithPath: NSTemporaryDirectory(),
isDirectory: true
).appendingPathComponent(NSUUID().uuidString)
let fileManager = FileManager()
// we need to specify type as ()? as otherwise the compiler generates a warning
let success : ()? = try? fileManager.createDirectory(
at: photoDir!,
withIntermediateDirectories: true,
attributes: nil
)
return success != nil ? photoDir! as NSURL : nil
}
深入教程在这里Live Photo API on iOS
问题有点混乱
首先，如果你想选择实时照片并播放实时照片。我建议你使用照片框架而不是 UIImagePickerController。这样您就可以获取资产并拥有更多控制权。然后，您可以通过将 设置为或，使用PHLivePhotoView将实时照片播放为 mov 或静音版本。startPlayback(with:)hintfull
你可以参考这里的代码：
其次，如果你想将live photo转换成mov，你粘贴的代码就可以了，如果你想直接播放mov，你可能需要使用AVPlayer
另外，WWDC 提供了使用照片框架的示例应用程序
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
let phAsset = info[.phAsset] as? PHAsset
imagePickerController.dismiss(animated: true, completion: nil)
let style = phAsset?.playbackStyle
if(style != .livePhoto) {
print("This is not a live photo")
return
}
let filePath = NSTemporaryDirectory() + String(format: "%.0f", NSDate().timeIntervalSince1970) + "_.mov"
let fileURL = NSURL(fileURLWithPath: filePath)
let options = PHLivePhotoRequestOptions()
options.deliveryMode = .fastFormat
options.isNetworkAccessAllowed = true
PHImageManager.default().requestLivePhoto(for: phAsset!, targetSize: CGSize(width: 1920, height: 1080), contentMode: PHImageContentMode.default, options: options) { livePhoto, info in
if((livePhoto) != nil) {
let assetResources = PHAssetResource.assetResources(for: livePhoto!)
var videoResource : PHAssetResource?
for resources in assetResources {
if(resources.type == .pairedVideo) {
videoResource = resources
break
}
}
guard let videoResource = videoResource else {
fatalError("video resource is nil")
}
PHAssetResourceManager.default().writeData(for: videoResource, toFile: fileURL as URL, options: nil) { error in
let avAsset : AVAsset = AVAsset(url: fileURL as URL)
DispatchQueue.main.async { [self] in
// Whatever you do using fileURL or avAsset.
}
}
}
}
}
斯威夫特 5
func videoUrlForLivePhotoAsset(asset: PHAsset, completionHandler: @escaping (_ result: URL?) -> Void) {
print("videoUrlForLivePhotoAsset: \(asset)")
let options : PHLivePhotoRequestOptions = PHLivePhotoRequestOptions.init()
options.deliveryMode = .fastFormat
options.isNetworkAccessAllowed = true
PHImageManager.default().requestLivePhoto(for: asset, targetSize: UIScreen.main.bounds.size, contentMode: .default, options: options) { (livePhoto, info) in
if livePhoto != nil {
let assetResources : [PHAssetResource] = PHAssetResource.assetResources(for: livePhoto!)
var videoResource : PHAssetResource?
for resource in assetResources {
if resource.type == .pairedVideo {
videoResource = resource
break
}
}
guard let photoDir = self.generateFolderForLivePhotoResources() else {
return
}
print("videoResource: \(videoResource)")
if videoResource != nil {
self.saveAssetResource(resource: videoResource!, inDirectory: photoDir, buffer: nil, maybeError: nil) { (fileUrl) in
completionHandler(fileUrl)
}
}
} else {
completionHandler(nil)
}
}
}
func saveAssetResource(
resource: PHAssetResource,
inDirectory: NSURL,
buffer: NSMutableData?, maybeError: Error?, completionHandler: @escaping (_ result: URL?) -> Void) {
guard maybeError == nil else {
print("Could not request data for resource: \(resource), error: \(String(describing: maybeError))")
return
}
let maybeExt = UTTypeCopyPreferredTagWithClass(
resource.uniformTypeIdentifier as CFString,
kUTTagClassFilenameExtension
)?.takeRetainedValue()
guard let ext = maybeExt else {
return
}
guard var fileUrl = inDirectory.appendingPathComponent(NSUUID().uuidString) else {
print("file url error")
return
}
fileUrl = fileUrl.appendingPathExtension(ext as String)
if let buffer = buffer, buffer.write(to: fileUrl, atomically: true) {
print("Saved resource form buffer \(resource) to filepath \(String(describing: fileUrl))")
completionHandler(fileUrl)
} else {
PHAssetResourceManager.default().writeData(for: resource, toFile: fileUrl, options: nil) { (error) in
print("Saved resource directly \(resource) to filepath \(String(describing: fileUrl))")
if error == nil {
completionHandler(fileUrl)
} else {
completionHandler(nil)
}
}
}
}
func generateFolderForLivePhotoResources() -> NSURL? {
let photoDir = NSURL(
// NB: Files in NSTemporaryDirectory() are automatically cleaned up by the OS
fileURLWithPath: NSTemporaryDirectory(),
isDirectory: true
).appendingPathComponent(NSUUID().uuidString)
let fileManager = FileManager()
// we need to specify type as ()? as otherwise the compiler generates a warning
let success : ()? = try? fileManager.createDirectory(
at: photoDir!,
withIntermediateDirectories: true,
attributes: nil
)
return success != nil ? photoDir! as NSURL : nil
}
使用以下命令调用：
let asset = PHAsset.init()
self.videoUrlForLivePhotoAsset(asset: asset!) { (url) in
print("url: \(url)")
}
注意：您需要清理 Temp 和 Documents 目录，并删除文件。