iOS照相机里面那个按钮的点击事件的获取

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

{

   // NSLog(@"%@", viewController);

    for (UIView *tmpView in viewController.view.subviews) {

        NSLog(@"%@", tmpView.subviews);

        

        for (UIView *tmpView2 in tmpView.subviews) {

            NSLog(@"%@", tmpView2.subviews);

            if ( [[[tmpView2 class]description]isEqualToString:@"CAMShutterButton"]) {

                UIButton *shutButton = (UIButton *)tmpView2;

                [shutButton addTarget:self action:@selector(setHiddenLabel) forControlEvents:UIControlEventTouchUpInside];

            }

        }

    }

}