一、前言
项目开发中遇到需要保存照片到特定文件夹的功能，并且图片还要自定义名称，因为平时都是直接保存使用还没有涉及过特定保存，所以这里记录下实现过程
二、相册文件夹创建和保存
-(PHAssetCollection *)getAssetCollectionAppNameAndCreate
{
//设置你想要创建的相册的名字
NSString *title = @"自定义相册";
//获取与要创建的相册同名的自定义相册
PHFetchResult<PHAssetCollection *> *collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *collection in collections) {
//遍历
if ([collection.localizedTitle isEqualToString:title]) {
//找到了同名的自定义相册，返回
return collection;
}
}
//程序走到这，说明没有找到自定义的相册，需要创建
NSError *error = nil;
__block NSString *createID = nil; //用来获取创建好的相册
[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
//发起了创建新相册的请求，并拿到相册的id，当前并没有创建成功，待创建成功后，通过id来获取创建好的自定义相册
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title];
createID = request.placeholderForCreatedAssetCollection.localIdentifier;
} error:&error];
if (error) {
NSLog(@"创建失败");
return nil;
}else{
NSLog(@"创建成功");
//通过id获取创建完成的相册
return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createID] options:nil].firstObject;
}
}
-(PHFetchResult<PHAsset *> *)saveImageWithFileUrl:(NSString *)fileUrl
{
__block NSString *createdAssetID = nil;
NSError *error = nil;
[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
//直接保存image，不可设置名称
// createdAssetID = [PHAssetChangeRequest creationRequestForAssetFromImage:image].placeholderForCreatedAsset.localIdentifier;
// 根据路径保存图片，可设置名称
PHAssetCreationRequest *request = [PHAssetCreationRequest creationRequestForAsset];
createdAssetID = request.placeholderForCreatedAsset.localIdentifier;
PHAssetResourceCreationOptions *option = [[PHAssetResourceCreationOptions alloc] init];
option.shouldMoveFile = YES;
option.originalFilename = @"照片的名字啊";
[request addResourceWithType:PHAssetResourceTypePhoto fileURL:[NSURL fileURLWithPath:fileUrl] options:option];
} error:&error];
if (error) {
return nil;
}
//获取保存到系统相册成功后的 asset 对象集合(一张图片也是返回一个集合)
PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsWithLocalIdentifiers:@[createdAssetID] options:nil];
return assets;
}
// 保存到相册
- (void)keepToAlbum {
PHAssetCollection *assetCollection = [self getAssetCollectionAppNameAndCreate];
if (assetCollection == nil) {
NSLog(@"相册创建失败");
return;
}
//将图片保存到系统的相册
PHFetchResult<PHAsset *> *assets = [self saveImageWithFileUrl:self.fileUrl];
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//选取自定义相册进行操作
PHAssetCollectionChangeRequest *collectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
//插入图片到自定义相册
PHFetchResult<PHAsset *> *assetCount = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
[collectionChangeRequest insertAssets:assets atIndexes:[NSIndexSet indexSetWithIndex:assetCount.count]];
NSLog(@" 保存完成");
} completionHandler:^(BOOL success, NSError * _Nullable error) {
}];
}
三、相册文件夹图片读取
/// 获取文件夹
-(PHAssetCollection *)getAssetCollectionAppName {
//设置你想要创建的相册的名字, 和保存的时候名字相同即可获取到那个文件夹
NSString *title = @"自定义相册";
//获取与要创建的相册同名的自定义相册
PHFetchResult<PHAssetCollection *> *collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *collection in collections) {
//遍历
if ([collection.localizedTitle isEqualToString:title]) {
//找到了同名的自定义相册，返回
return collection;
}
}
return nil;
}
// 加载图片
- (void)loadPhotoes {
PHAssetCollection *assetCollection = [self getAssetCollectionAppName];
if (assetCollection == nil) {
NSLog(@"相册创建失败");
return;
}
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
//ascending为NO，即为逆序(由现在到过去)， ascending为YES时即为默认排序，由远到近
NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO];
fetchOptions.sortDescriptors = @[sort];
PHFetchResult<PHAsset *> *assetCount = [PHAsset fetchAssetsInAssetCollection:assetCollection options:fetchOptions];
for (int i = 0; i<assetCount.count; i++) {
PHAsset *asset = assetCount[i];
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.synchronous = YES;
// iCloud图片
options.networkAccessAllowed = YES;
// 高清图
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
[PHImageManager.defaultManager requestImageForAsset:asset targetSize:CGSizeMake(800, 400) contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
// 第一种获取照片路径的方法
NSString *fileUrl = [NSString stringWithFormat:@"%@",[info valueForKey:@"PHImageFileURLKey"]];
NSArray<PHAssetResource *> *resources = [PHAssetResource assetResourcesForAsset:asset];
PHAssetResource *firstResource = resources.firstObject;
// 第二种获取照片路径的方法
NSString *privateFileURL = [NSString stringWithFormat:@"%@",[firstResource valueForKey:@"privateFileURL"]];
if (fileUrl.length <= 0 || [@"(null)" isEqualToString:fileUrl]) {
fileUrl = privateFileURL;
}
NSString *fileName = @"未命名";
if (firstResource){
fileName = firstResource.originalFilename;
}
NSLog(@"fileName:%@", fileName);
// 拿到了fileUrl 和 fileName，就可以根据自己的需要处理了
}];
}
[self.tableView reloadData];
}
四、总结
以上是照片文件夹创建和获取的情况，有问题大家可以评论区沟通
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