show how to use ALAssetsLibrary and ALAssets on iOS.
use this 4 funcion include full operate about use iOS Photo Albums.
How to use
enumerate -> save -> use url -> find large image -> find image info.
1,`- (void)getAlbumAssets` function.
used to enumerate iOS Photos Application Albums.
2,- (void)getAssetsFromAssetURL:(NSString *)urlString function.
used to get asset from url.
3,+ (NSDictionary *)infoByAssert:(ALAsset *)result andType:(NSString *)type function.
get asset infomation like exif,gps,tiff and so on.
4,+ (UIImage *)findLargeImage:(ALAsset *)resultfunction
get large image by asset