按下iphone相机按钮时显示活动指示

Question

如何在拍摄快照后按下相机按钮（USE按钮）时添加活动指示。

看起来好像挂了几秒钟。

请帮忙

Answer 1

UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
[indicator sizeToFit];
indicator.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
                              UIViewAutoresizingFlexibleRightMargin |
                              UIViewAutoresizingFlexibleTopMargin |
                              UIViewAutoresizingFlexibleBottomMargin);

indicator.tag = 1;
[self.view addSubview:indicator];
[indicator setBackgroundColor:[UIColor clearColor]];
indicator.center = self.view.center;
indicator.hidden = FALSE;
[indicator startAnimating];