PHAsset

• 靜態(tài)資源類(詳情)

PHAssetCreationRequest

• 靜態(tài)資源處理類(增刪改查,創(chuàng)建)

PHAssetCollection

• 相冊文件夾類(相冊)

PHAssetCollectionChangeRequest

• 相冊文件夾處理類(增刪改查,創(chuàng)建)

PHImageManager

• 圖片管理類(將靜態(tài)資源轉(zhuǎn)成圖片)(requestImageForAsset)

詳情類可以通過fetch獲取到系統(tǒng)相冊里的相關資源,包裝的請求類可以對齊進行增刪改查創(chuàng)建,圖片管理類可以獲取到圖片對象

所有的修改移動圖片操作都要在[[PHPhotoLibrary sharedPhotoLibrary] performChanges:]方法中執(zhí)行

獲取資源方法

   
//    獲取到所有的靜態(tài)資源
    PHFetchResult<PHAsset *> *  assets=[PHAsset fetchAssetsWithOptions:nil];
    for (PHAsset* asset in assets) {
        [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:CGSizeMake(80, 80) contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
            NSLog(@"%@",result);
        }];
    }
    
//    獲取到所有的相冊文件夾
    PHFetchResult<PHAssetCollection *> * collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
    for (PHCollection* collection in collections) {
        NSLog(@"%@",collection.localizedTitle);
    }
    
//    獲取到相機膠卷目錄
    PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].firstObject;
    NSLog(@"%@",cameraRoll.localizedTitle);
    

保存圖片

//保存按鈕事件
- (IBAction)savePic:(UIButton *)sender {
    
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    
    switch (status) {
        case PHAuthorizationStatusDenied:
            NSLog(@"授權(quán)拒絕");
            break;
        case PHAuthorizationStatusRestricted:
            NSLog(@"系統(tǒng)原因?qū)е聼o法授權(quán)相冊");
        case PHAuthorizationStatusNotDetermined:{
            
            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
                [self saveImgToCustomPic];
            }];
        }
            break;
        case PHAuthorizationStatusAuthorized:{
            [self saveImgToCustomPic];
        }
            break;
            
        default:
            break;
    }
    
    
}



/** 把相機膠卷里的圖片保存到自定義相冊里*/
- (void)saveImgToCustomPic
{
    __block NSString *assetId = nil;
    [SVProgressHUD setBackgroundColor:[UIColor blackColor]];
    [SVProgressHUD setForegroundColor:[UIColor whiteColor]];
    phpLibraryHandler(^{
        //        創(chuàng)建一個靜態(tài)資源處理對象 (會自動保存圖片到相機膠卷)
        assetId = [PHAssetCreationRequest creationRequestForAssetFromImage:_imageView.image].placeholderForCreatedAsset.localIdentifier;
    },^(BOOL success, NSError * _Nullable error) {
        if (!success) {
            [SVProgressHUD showErrorWithStatus:@"保存失敗"];
            return ;
        }
        PHAssetCollection *createdCollection = [self getPHAssetCollection];
        phpLibraryHandler(^{
            //                根據(jù)相片標識獲取到相片對象
            PHAsset *assets = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil].lastObject;
            //                獲取到已創(chuàng)建相冊的請求處理對象
            PHAssetCollectionChangeRequest *collectionRequest =[PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdCollection];
            //                給相冊添加相片資源
            [collectionRequest addAssets:@[assets]];
        }, ^(BOOL success, NSError * _Nullable error) {
            
            if (!success) {
                [SVProgressHUD showErrorWithStatus:@"保存失敗"];
                return ;
            }
            [SVProgressHUD showSuccessWithStatus:@"保存成功"];
        });
        
    });
    
}


/**返回相冊對象*/
- (PHAssetCollection*)getPHAssetCollection
{
    PHFetchResult<PHAssetCollection *> * collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
    for (PHAssetCollection* collection in collections) {
        if ([collection.localizedTitle isEqualToString:libraryName]) {
            return collection;
        }
    }
    
    __block NSString *collerctionId = nil;
    //    同步執(zhí)行相冊創(chuàng)建方法
    [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
        collerctionId = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:libraryName].placeholderForCreatedAssetCollection.localIdentifier;
    } error:nil];
    return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[collerctionId] options:nil].lastObject;
    
    
}

獲取相冊下的所有靜態(tài)資源

 //    獲取到所有的相冊文件夾
    PHFetchResult<PHAssetCollection *> * collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
    for (PHAssetCollection* collection in collections) {
        
        //        獲取到每個相冊
        NSLog(@"%@",collection.localizedTitle);
        
        //        獲取到該相冊下的所有靜態(tài)資源
        PHFetchResult<PHAsset *> *  assets = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
        for (PHAsset* asset in assets) {
            [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:CGSizeMake(80, 80) contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
                NSLog(@"%@",result);
            }];
        }
        
    }