// 当从相册里选择一张照片或者用相机进行拍摄之后，该方法被调用
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
    NSLog(@"SMILE!");
    [self.capturedImages addObject:image];

    if ([self.cameraTimer isValid])
    {
        return;
    }
    
    if (self.imagePickerController.sourceType == UIImagePickerControllerSourceTypeCamera)
    {
        
        UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    }
    

    [self finishAndUpdate];
}

- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo
{
    UIAlertView *alert;
    
    if (error)
    {
        alert = [[UIAlertView alloc] initWithTitle:@"错误"
                                           message:@"保存失败"
                                          delegate:self cancelButtonTitle:@"确定"
                                 otherButtonTitles:nil];
    }
    else
    {
        alert = [[UIAlertView alloc] initWithTitle:@"成功"
                                           message:@"保存成功"
                                          delegate:self cancelButtonTitle:@"确定"
                                 otherButtonTitles:nil];
    }
    [alert show];
}