现在我正在使用以下代码。但是发生了一些奇怪的事情。
PHLivePhoto *livePhoto = .....;
NSString *fileName = [[NSProcessInfo processInfo] globallyUniqueString];
NSURL *url = [NSURL fileURLWithPath: NSTemporaryDirectory()];
url = [url URLByAppendingPathComponent: fileName];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject: livePhoto];
[data writeToURL: url atomically: YES];
CKAsset *asset = [[CKAsset alloc] initWithFileURL: url];
然后使用
CKModifyRecordsOperation将资产保存到iCloud，然后取回。NSData *data = [NSData dataWithContentsOfURL: fetchedAsset.fileURL];
PHLivePhoto *thePhoto = [NSKeyedUnarchiver unarchiveObjectWithData: data];
PHLivePhotoView *photoView = ......;
photoView.livePhoto = thePhoto;
大多数功能都可以正常工作，只是当photoView停止播放时，photoView的图像才消失。如果再次长按它，则可以正常播放。
为什么会这样呢？
最佳答案
看来NSKeyedArchiver不能按预期保存实时照片。作为解决方案之一，您应该拆除PHLivePhoto并分别检索视频和静止图像，然后将它们上传到iCloud：
#import <Photos/Photos.h>
#import <CloudKit/CloudKit.h>
#import <MobileCoreServices/MobileCoreServices.h>
+ (void) disassembleLivePhoto:(nonnull PHLivePhoto*)livePhoto completion:(void (^__nonnull)(UIImage * _Nullable stillImage, AVURLAsset * _Nullable video, NSURL* _Nullable imageURL, NSURL* _Nullable videoURL))block
{
NSArray<PHAssetResource*>* resources = [PHAssetResource assetResourcesForLivePhoto:livePhoto];
__block PHAssetResource *resImage = nil, *resVideo = nil;
NSString *fileName = [[NSUUID UUID] UUIDString];
NSURL *urlMov = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:[fileName stringByAppendingPathExtension:@"mov"]]];
NSURL *urlImg = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:[fileName stringByAppendingPathExtension:@"jpg"]]];
[resources enumerateObjectsUsingBlock:^(PHAssetResource * _Nonnull res, NSUInteger idx, BOOL * _Nonnull stop) {
if (res.type == PHAssetResourceTypePairedVideo){
resVideo = res;
} else if (res.type == PHAssetResourceTypePhoto){
resImage = res;
}
}];
[[PHAssetResourceManager defaultManager] writeDataForAssetResource:resVideo toFile:urlMov options:nil completionHandler:^(NSError * _Nullable error) {
[[PHAssetResourceManager defaultManager] writeDataForAssetResource:resImage toFile:urlImg options:nil completionHandler:^(NSError * _Nullable error) {
block([UIImage imageWithData:[NSData dataWithContentsOfURL:urlImg]], [AVURLAsset assetWithURL:urlMov], urlImg, urlMov);
}];
}];
}
- (void) sendLivePhotoComponentsWithImageURL:(nonnull NSURL*)urlImage videoURL:(nonnull NSURL*)urlVideo completionBlock:(void(^ __nonnull)(CKRecord* __nullable recordLivePhoto))block
{
CKAsset *assetVideo = [[CKAsset alloc] initWithFileURL:urlVideo];
CKAsset *assetImage = [[CKAsset alloc] initWithFileURL:urlImage];
CKContainer *ckcContainer = [CKContainer defaultContainer];
CKDatabase *ckdbPublic = [ckcContainer publicCloudDatabase]; // in this example I use public DB
[ckcContainer fetchUserRecordIDWithCompletionHandler:^(CKRecordID * _Nullable ownerRecordID, NSError * _Nullable error) {
CKRecordID *recordID = [[CKRecordID alloc] initWithRecordName:@"your_record_name_e.g._UUID" zoneID:ownerRecordID.zoneID];
CKRecord *record = [[CKRecord alloc] initWithRecordType:@"your_record_type" recordID:recordID];
record[@"your_video_asset_CK_key"] = assetVideo;
record[@"your_image_asset_CK_key"] = assetImage;
CKModifyRecordsOperation * op = [[CKModifyRecordsOperation alloc] initWithRecordsToSave:@[record] recordIDsToDelete:nil];
op.modifyRecordsCompletionBlock = ^void(NSArray<CKRecord *> * _Nullable savedRecords, NSArray<CKRecordID *> * _Nullable deletedRecordIDs, NSError * _Nullable operationError){
block(savedRecords.firstObject); // Done.
};
op.qualityOfService = NSQualityOfServiceUserInitiated;
[ckdbPublic addOperation:op];
}];
}
第二部分（从iCloud检索）有一点“技巧”-您应确保图像和视频的元数据中包含相同的资产ID，否则iOS不会知道这两部分（视频和图像）属于一个复合物资源-实时照片-不会将它们组合成单个正确的
PHLivePhoto对象（但是，在这种情况下，很可能会得到PHLivePhoto，但它将被构造为静态图片，没有动画）。这里最简单的方法是从视频资产中提取资产ID，然后通过为其分配相同的ID来修改图像部分：
- (void) assembleLivePhotoWithCKRecord:(nonnull CKRecord*)record completion:(void (^__nullable)(PHLivePhoto* _Nullable livePhoto))block
{
// Operational data
CKAsset *assetVideo = record[@"your_video_asset_CK_key"];
CKAsset *assetImage = record[@"your_image_asset_CK_key"];
// Get video and prepare local URLs
NSString *fileName = [[NSUUID UUID] UUIDString];
NSString *pathVideo = [NSTemporaryDirectory() stringByAppendingPathComponent:[fileName stringByAppendingPathExtension:@"mov"]];
NSString *pathImage = [NSTemporaryDirectory() stringByAppendingPathComponent:[fileName stringByAppendingPathExtension:@"jpg"]];
NSURL *urlVideo = [NSURL fileURLWithPath:pathVideo];
NSURL *urlImage = [NSURL fileURLWithPath:pathImage];
NSData *dataVideo = [NSData dataWithContentsOfURL:assetVideo.fileURL];
[[NSFileManager defaultManager] createFileAtPath:pathVideo contents:dataVideo attributes:nil];
// Getting video asset ID from metadata
NSString *metaID = nil;
NSArray<AVMetadataItem*>* metadata = [[AVURLAsset assetWithURL:urlVideo] metadata];
for (AVMetadataItem *md in metadata){
if ([md.identifier containsString:@"com.apple.quicktime.content.identifier"]){
metaID = (NSString*)(md.value);
break;
}
}
// Get image
NSData *dataImage = [NSData dataWithContentsOfURL:assetImage.fileURL];
UIImage *image = [UIImage imageWithData:dataImage];
CGImageRef ref = [image CGImage];
// Update image's metadata to make it conform video metadata
NSDictionary *imgMetadata = @{@"{MakerApple}": @{@"17": metaID}};
NSMutableData *imageData = [NSMutableData new];
CGImageDestinationRef dest = CGImageDestinationCreateWithData((CFMutableDataRef)imageData, kUTTypeJPEG, 1, nil);
CGImageDestinationAddImage(dest, ref, (CFDictionaryRef)imgMetadata);
CGImageDestinationFinalize(dest);
[imageData writeToFile:pathImage atomically:YES];
[PHLivePhoto requestLivePhotoWithResourceFileURLs:@[urlImage, urlVideo] placeholderImage:nil targetSize:CGSizeZero contentMode:PHImageContentModeAspectFit resultHandler:^(PHLivePhoto * _Nullable livePhoto, NSDictionary * _Nonnull info) {
block(livePhoto); // NOTE: this block may be called several times
}];
}
根据Apple的文档，可能会多次调用带有实时照片的结果块（有关更多信息，请参见
PHLivePhoto.h）：将多次调用结果处理程序，以提供内容越来越多的新PHLivePhoto实例。
另外，请记住，您应该添加所有必要的检查（实际上有很多检查）和错误处理程序等。
关于ios - 如何使用CloudKit API将PHLivePhoto保存到iCloud，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38106104/