- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
     
       *)info{        NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];    //1.选择的是图片资源    if ([mediaType isEqualToString:@"public.image"]) {
     

　　　　　　if (img !=nil) {

            //获取图片的名字

            __block NSString* imageFileName;

            NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];

            NSLog(@"imgurl:%@",imageURL);

            __weak typeof(self) weakSelf = self;

            ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)

            {

                ALAssetRepresentation *representation = [myasset defaultRepresentation];

                imageFileName = [representation filename];

            };

            ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];

            [assetslibrary assetForURL:imageURL

                           resultBlock:resultblock

                          failureBlock:nil];

        }

}}