小记：因为项目中使用到了录屏功能，所以采用了苹果自带的ReplayKit框架,由于项目框架的局限性，我们只能把录制好的视频保存到相册，即使我们拿到了 movieUrl,我们依然不能获取到数据进行本地保存，所以需要把相册中的数据读取到项目的沙盒，以便进行后续的操作。
读取相册信息
1 首先需要导入 #import <Photos/Photos.h>
2 读取相册内容
PHFetchOptions *option = [[PHFetchOptions alloc] init];
option.predicate = [NSPredicate predicateWithFormat:@"mediaType == %ld",PHAssetMediaTypeVideo];
option.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
struct utsname systemInfo;
uname(&systemInfo);
NSString*phoneType = [NSString stringWithCString: systemInfo.machine encoding:NSASCIIStringEncoding];
PHFetchResult *smartAlbums;
if([phoneType isEqualToString:@"iPhone7,2"]){
smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
}else{
smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumVideos options:nil];
}
//fetchAssetCollectionsWithType
// 苹果6 的取法
// PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
// // 非苹果 6 的取法
// PHFetchResult *smartAlbumss =[PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumVideos options:nil];
for (PHAssetCollection *collection in smartAlbums) {
// 有可能是PHCollectionList类的的对象，过滤掉
if (![collection isKindOfClass:[PHAssetCollection class]]) continue;
// 过滤空相册
if (collection.estimatedAssetCount <= 0) continue;
if (collection) {
PHAsset *phAsset;
PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:collection options:option];
// 取相册中最新写入的视频
// // 苹果6 的做法
if([phoneType isEqualToString:@"iPhone7,2"]){
phAsset = (PHAsset *)fetchResult.lastObject;
}else{
phAsset = (PHAsset *)fetchResult.firstObject;
}
// 通过 PHAsset 来获取视频的url地址、时长、大小等信息
}
获取图片或者视频的信息
- (void)getVideoPathFromPHAsset:(PHAsset *)asset Complete:(void (^)(NSString *filePatch,NSString *dTime))result {
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHImageRequestOptionsVersionCurrent;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
NSString * sandboxExtensionTokenKey = info[@"PHImageFileSandboxExtensionTokenKey"];
NSArray * arr = [sandboxExtensionTokenKey componentsSeparatedByString:@";"];
NSString * filePath = arr[arr.count - 1];
CMTime time = [asset duration];
int seconds = ceil(time.value/time.timescale);
NSString *str_minute = [NSString stringWithFormat:@"%d",seconds/60];
NSString *str_second = [NSString stringWithFormat:@"%.2d",seconds%60];
NSString *format_time = [NSString stringWithFormat:@"%@:%@",str_minute,str_second];
// 判断 路径是不是存在，避免返回空的情况
if (filePath) {
result(filePath,format_time);
}else{
}
}];
}
注：发现不同苹果手机的相册的目录结构是不一样的，和系统的版本无关，因为手头资源有限，这里只是测试了6，7，7p，x 。发现只有6的相册的目录结构和别的手机的不一样，其余的均相同，这里采用的6是iOS12.2。如有新的发现请留言相告。
