@property (nonatomic, strong) NSMutableArray *titleAndAssetsArray;//下个tableview的标题和图片资源
_titleAndAssetsArray = [NSMutableArray array];
//注册通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getAssetsData:) name:@"PhotoAssets" object:nil];

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"PhotoAssets" object:nil];
}

//获得通知里面的数据
- (void)getAssetsData:(NSNotification *)Info
{
    NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
      
        PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
        options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
        // 同步获得图片, 只会返回1张图片
        options.synchronous = YES;
        options.resizeMode = PHImageRequestOptionsResizeModeExact;
        options.networkAccessAllowed = NO;
        //PHImageManagerMaximumSize为原图尺寸, 可以自定义尺寸CGSizeMake(180, 180)
        if ([Info.userInfo[@"assetsArray"] count] > 0) {
            for (int i = 0; i < [Info.userInfo[@"assetsArray"] count]; i++) {
                PHAsset *asset = Info.userInfo[@"assetsArray"][i];
                [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeAspectFill options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
                    //do something, 拿到result图片,自行处理
                    NSLog(@"%@",result);
                    
                }];
                
            }
        }
        
    }];
    [operation start];
    
}

//点击按钮,选择图片
- (IBAction)button:(id)sender {
    
__weak ViewController *weakSelf = self;
    
//可以选择几张照片(拍照+选图的总数)
[UserData userDataStandard].photoNumber = 6;//自行修改
    
UIAlertController *albumalertController = [UIAlertController alertControllerWithTitle:@"选择照片" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
UIAlertAction *albumAction = [UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {//从相册选择
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusDenied) {//用户拒绝访问
UIAlertController *settingalertController = [UIAlertController alertControllerWithTitle:@"友情提示" message:@"您的相册权限尚未开启,是否前去设置-隐私-照片中开启相册权限?" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"去设置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {//去设置相册权限
NSURL *url = [NSURL URLWithString:@"prefs:root=Privacy&path=Photos"];
if ([[UIApplication sharedApplication] canOpenURL:url]) {     [[UIApplication sharedApplication] openURL:url];
}
}];
[settingalertController addAction:cancelAction];
[settingalertController addAction:okAction];
[weakSelf presentViewController:settingalertController animated:YES completion:nil];
} else {//允许访问相册
// 获得所有的自定义相簿
PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
// 遍历所有的自定义相簿
if (assetCollections.count > 0) {
for (PHAssetCollection *assetCollection in assetCollections) {
PHFetchResult<PHAsset *> *assets1 = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
NSDictionary *dic = @{@"title":assetCollection.localizedTitle,@"assets":assets1,@"count":[NSString stringWithFormat:@"%ld",assets1.count]};
[_titleAndAssetsArray addObject:dic];
}

}
// 获得相机胶卷,  estimatedAssetCount这个属性,在自定义相册里面返回的照片数是正确的,在相机胶圈中,返回的是不正确的
PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;
// 获得某个相簿中的所有PHAsset对象
PHFetchResult<PHAsset *> *assets2 = [PHAsset fetchAssetsInAssetCollection:cameraRoll options:nil];
if (cameraRoll != nil) {
NSDictionary *dic = @{@"title":cameraRoll.localizedTitle,@"assets":assets2,@"count":[NSString stringWithFormat:@"%ld",assets2.count]};
[_titleAndAssetsArray addObject:dic];
}
    
if (_titleAndAssetsArray.count > 0) {
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"CustomStoryboard" bundle:[NSBundle mainBundle]];
SeleceAlbumViewController *seleVC = (SeleceAlbumViewController *)[storyboard instantiateViewControllerWithIdentifier:@"SeleceAlbumViewController"];
UINavigationController *navc = [[UINavigationController alloc] initWithRootViewController:seleVC];
seleVC.dataArray = [_titleAndAssetsArray copy];
    
[UserData userDataStandard].isSeleceArray = [NSMutableArray array];
[UserData userDataStandard].photoAssets = [NSMutableArray array];
//自定义标题名字和标记图片的名字
/* [UserData userDataStandard].firstTitle = @"选择相册";
 [UserData userDataStandard].twoTitle = @"选择照片";
 [UserData userDataStandard].markImageName = @"2";*/  
    
[self.navigationController presentViewController:navc animated:YES completion:nil];
} else {
NSLog(@"请先授权相册权限,授权之后再次点击");
}
}
}];
    
[albumalertController addAction:albumAction];
[albumalertController addAction:cancelAction];
[self presentViewController:albumalertController animated:YES completion:nil];

}