Save UIImage to photos album.

savedPhotoImage.m

- (void)savedPhotoImage:(UIImage*)image didFinishSavingWithError:(NSError *)error contextInfo: (void *)contextInfo {
    UIAlertView *alert = nil;
    if (error == nil) {
        alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"图片保存成功！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
        
    }
    else {
        NSLog(@"%@", [error localizedDescription]);
        NSLog(@"info: %@", contextInfo);
        alert = [[UIAlertView alloc] initWithTitle:@"错误" message:@"图片保存失败，请重试！" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
    }
    [alert show];
    [alert release];
}

- (IBAction)saveBtnClicked:(id)sender
{
    UIImageWriteToSavedPhotosAlbum([_imageScrollController currentImage], self, @selector(savedPhotoImage:didFinishSavingWithError:contextInfo:), nil);
}