我有一个函数，可以从iOS设备的相机胶卷返回一系列照片和视频。信息已正确返回，但是，我还需要返回到目前为止无法执行的照片和视频的路径。
这是我正在使用的代码。在此代码段中，照片和视频路径代码大约为2/3，以“ if（asset.mediaType == PHAssetMediaTypeImage）”开头：
- (void) photos:(CDVInvokedUrlCommand*)command {
if (![self isNull:self.photosCommand]) {
[self failure:command withMessage:E_PHOTO_BUSY];
return;
}
self.photosCommand = command;
CDVPhotos* __weak weakSelf = self;
[self checkPermissionsOf:command andRun:^{
NSArray* collectionIds = [weakSelf argOf:command atIndex:0 withDefault:nil];
NSLog(@"photos: collectionIds=%@", collectionIds);
NSDictionary* options = [weakSelf argOf:command atIndex:1 withDefault:@{}];
int offset = [[weakSelf valueFrom:options
byKey:P_LIST_OFFSET
withDefault:@"0"] intValue];
int limit = [[weakSelf valueFrom:options
byKey:P_LIST_LIMIT
withDefault:@"0"] intValue];
NSTimeInterval interval = [[weakSelf valueFrom:options
byKey:P_LIST_INTERVAL
withDefault:@"30"] intValue];
interval = interval < 0 ? .03f : interval / 1000.0f;
PHFetchResult<PHAssetCollection*>* fetchResultAssetCollections
= collectionIds == nil || collectionIds.count == 0
? [weakSelf fetchCollections:@{}]
: [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:collectionIds
options:nil];
if (fetchResultAssetCollections == nil) {
weakSelf.photosCommand = nil;
[weakSelf failure:command withMessage:E_COLLECTION_MODE];
return;
}
int __block fetched = 0;
NSMutableArray<PHAsset*>* __block skippedAssets = [NSMutableArray array];
NSMutableArray<NSDictionary*>* __block result = [NSMutableArray array];
[fetchResultAssetCollections enumerateObjectsUsingBlock:
^(PHAssetCollection* _Nonnull assetCollection, NSUInteger idx, BOOL* _Nonnull stop) {
if ([weakSelf isNull:weakSelf.photosCommand]) {
*stop = YES;
return;
}
PHFetchOptions* fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor
sortDescriptorWithKey:@"creationDate"
ascending:YES]];
fetchOptions.predicate
= [NSPredicate predicateWithFormat:@"mediaType = %d OR mediaType = %d", PHAssetMediaTypeImage, PHAssetMediaTypeVideo];
PHFetchResult<PHAsset*>* fetchResultAssets =
[PHAsset fetchAssetsInAssetCollection:assetCollection options:fetchOptions];
[fetchResultAssets enumerateObjectsUsingBlock:
^(PHAsset* _Nonnull asset, NSUInteger idx, BOOL* _Nonnull stop) {
if ([weakSelf isNull:weakSelf.photosCommand]) {
*stop = YES;
return;
}
NSArray *resources = [PHAssetResource assetResourcesForAsset:asset];
NSString *filename = ((PHAssetResource*)resources[0]).originalFilename;
NSTextCheckingResult* match
= [weakSelf.extRegex
firstMatchInString:filename
options:0
range:NSMakeRange(0, filename.length)];
NSString* name = [filename substringWithRange:[match rangeAtIndex:1]];
NSString* ext = [[filename substringWithRange:[match rangeAtIndex:2]] uppercaseString];
NSString* type = weakSelf.extType[ext];
if (offset <= fetched) {
if (asset.mediaType == PHAssetMediaTypeImage)
{
[[PHImageManager defaultManager] requestImageDataForAsset:asset options:nil resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
NSURL *url = [info objectForKey:@"PHImageFileURLKey"];
// do what you want with it
}];
}
else if (asset.mediaType == PHAssetMediaTypeVideo)
{
[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:nil resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info)
{
if ([asset isKindOfClass:[AVURLAsset class]])
{
NSURL *url = [(AVURLAsset*)asset URL];
// do what you want with it
}
}];
}
NSMutableDictionary<NSString*, NSObject*>* assetItem
= [NSMutableDictionary dictionaryWithObjectsAndKeys:
asset.localIdentifier, P_ID,
name, P_NAME,
type, P_TYPE,
[weakSelf.dateFormat stringFromDate:asset.creationDate], P_DATE,
@((long) (asset.creationDate.timeIntervalSince1970 * 1000)), P_TS,
@(asset.pixelWidth), P_WIDTH,
@(asset.pixelHeight), P_HEIGHT,
nil];
if (![weakSelf isNull:asset.location]) {
CLLocationCoordinate2D coord = asset.location.coordinate;
[assetItem setValue:@(coord.latitude) forKey:P_LAT];
[assetItem setValue:@(coord.longitude) forKey:P_LON];
}
[result addObject:assetItem];
if (limit > 0 && result.count >= limit) {
[weakSelf partial:command withArray:result];
[result removeAllObjects];
[NSThread sleepForTimeInterval:interval];
}
}
++fetched;
}];
}];
[skippedAssets enumerateObjectsUsingBlock:^(PHAsset* _Nonnull asset, NSUInteger idx, BOOL* _Nonnull stop) {
NSLog(@"skipped asset %lu: id=%@; name=%@, type=%ld-%ld; size=%lux%lu;",
idx, asset.localIdentifier, [weakSelf getFilenameForAsset:asset],
(long)asset.mediaType, (long)asset.mediaSubtypes,
(unsigned long)asset.pixelWidth, asset.pixelHeight);
}];
weakSelf.photosCommand = nil;
[weakSelf success:command withArray:result];
}];
}
是否有更简单的方法来获取这些照片和视频的路径？是否有一条可用于相机胶卷的单一路径，该路径将在不同的iPhone上得到支持？