图片保存与搜索实现之iOS版

概述

Photos.framework的常见功能包括：创建自定义相册、保存图片到自定义相册、搜索所有相册的图片。本文介绍该实现。

保存图片到相册

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/**

* 保存图片到相册

*/

- (IBAction)saveImage {

PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];

if (status == PHAuthorizationStatusDenied) {

NSLog(@"请到【设置-隐私-照片】打开访问开关");

} else if (status == PHAuthorizationStatusRestricted) {

NSLog(@"无法访问相册");

} else {

// 保存相片的标识

__block NSString *assetId = nil;

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

// 保存相片到相机胶卷，并返回标识

assetId = [PHAssetCreationRequest creationRequestForAssetFromImage:[UIImage imageNamed:@"logo"]].placeholderForCreatedAsset.localIdentifier;

} completionHandler:^(BOOL success, NSError * _Nullable error) {

if (!success) {

NSLog(@"保存失败：%@", error);

return;

}

// 根据标识获得相片对象

PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil].lastObject;

// 拿到自定义的相册对象

PHAssetCollection *collection = [self collection];

if (collection == nil) return;

// 保存相片到自定义相册中

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

[[PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection] addAssets:@[asset]];

} completionHandler:^(BOOL success, NSError * _Nullable error) {

if (success) {

NSLog(@"保存成功");

} else {

NSLog(@"保存失败：%@", error);

}

}];

}];

}

}

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搜索所有相片

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/** * 查询所有的图片 */- (IBAction)searchAllImages {            // 遍历所有的自定义相册    PHFetchResult*collectionResult0 = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];    for (PHAssetCollection *collection in collectionResult0) {        [self searchAllImagesInCollection:collection];    }            // 获得相机胶卷的图片    PHFetchResult*collectionResult1 = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];    for (PHAssetCollection *collection in collectionResult1) {        if (![collection.localizedTitle isEqualToString:@"Camera Roll"]) continue;        [self searchAllImagesInCollection:collection];        break;    }}    /** * 查询某个相册里面的所有图片 */- (void)searchAllImagesInCollection:(PHAssetCollection *)collection{    // 采取同步获取图片（只获得一次图片）    PHImageRequestOptions *imageOptions = [[PHImageRequestOptions alloc] init];    imageOptions.synchronous = YES;            NSLog(@"相册名字：%@", collection.localizedTitle);            // 遍历这个相册中的所有图片    PHFetchResult*assetResult = [PHAsset fetchAssetsInAssetCollection:collection options:nil];

for (PHAsset *asset in assetResult) {

// 过滤非图片

if (asset.mediaType != PHAssetMediaTypeImage) continue;

// 图片原尺寸

CGSize targetSize = CGSizeMake(asset.pixelWidth, asset.pixelHeight);

// 请求图片

[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:targetSize contentMode:PHImageContentModeDefault options:imageOptions resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {

NSLog(@"图片：%@", result);

}];

}

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