Objective c 使用FGallery图像查看器

我正在尝试实现FGallery imageviewer。我有一个方法，它给了我一个我想要显示的所有照片URL的数组。接下来，我将实现以下FGallery方法

- (int)numberOfPhotosForPhotoGallery:(FGalleryViewController *)gallery
{
     return [_picturesForAlbum count];

}

- (FGalleryPhotoSourceType)photoGallery:(FGalleryViewController *)gallery sourceTypeForPhotoAtIndex:(NSUInteger)index
{
     return FGalleryPhotoSourceTypeNetwork;
}


- (NSString*)photoGallery:(FGalleryViewController *)gallery urlForPhotoSize:(FGalleryPhotoSize)size atIndex:(NSUInteger)index {
    return [_picturesForAlbum objectAtIndex:index];
}

在我的DidSelectRowForIndexath中，我做到了这一点

networkGallery = [[FGalleryViewController alloc] initWithPhotoSource:self.picturesForAlbum];
        [self.navigationController pushViewController:networkGallery animated:YES];

但是我不知道我应该在initWithPhotoSource中放什么。当我有这样的时候。我一直得到以下错误

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM numberOfPhotosForPhotoGallery:]: unrecognized selector sent to instance 0xc95bb60'

有人能帮我吗

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谢谢各位代表，即self。它将调用委托方法。 [[FGalleryViewController alloc]initWithPhotoSource:self]