获得通过UIImagePickerController选取的图片的名称信息

获取通过UIImagePickerController弹出的popover选择的图片的信息名称主要分3步。

1：获得从UIImagePicker选择的照片的Assert；

2：得到Assert的ALAssertRepresentation；
3：ALAssertRepresentation有个filename的属性

- (NSString *)filename

一个例子：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
{
ALAssetRepresentation *representation = [myasset defaultRepresentation];
NSString *fileName = [representation filename];
NSLog(@"fileName : %@",fileName);
};

ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
[assetslibrary assetForURL:imageURL
resultBlock:resultblock
failureBlock:nil];

}

这在ios5以后有效。