为什么IOS系统分享iPad不显示并闪退（有偿）

-(void)fpsPay2:(NSDictionary *)options callback:(UniModuleKeepAliveCallback)callback {  
    callback(@{@"code":@200,@"msg":@"start 2"},YES);  
    UIViewController *vc = [UIApplication sharedApplication].keyWindow.rootViewController;  
    UIViewController *currentShowingVC = [self findCurrentShowingViewControllerFrom:vc];  

    NSString *uti = [options objectForKey:@"uti"];  
    NSString *data = [options objectForKey:@"data"];  
    NSItemProvider *provider = [[NSItemProvider alloc]  
        initWithItem:data  
        typeIdentifier:uti];  

    NSExtensionItem *item = [[NSExtensionItem alloc] init];  
    item.accessibilityLabel = @"FPS";  
    item.attachments = @[ provider ];  

    UIActivityViewController *activityVC =  
        [[UIActivityViewController alloc] initWithActivityItems:@[ item ] applicationActivities:nil];  
    activityVC.popoverPresentationController.sourceView = currentShowingVC.view;  

    activityVC.completionHandler = ^(NSString *activityType, BOOL completed) {  
      if (completed) {  
        // 用户选择了某个活动完成分享  
          callback(@{@"code":@201,@"msg":@"分享"},YES);  
      } else {  
        // 用户取消了或者窗口关闭  
          callback(@{@"code":activityType,@"msg":@"取消"},YES);  
      }  
    };  

    [currentShowingVC presentViewController:activityVC animated:YES completion:NULL];  
    callback(@{@"code":@200,@"msg":@"end"},YES);  

}  

- (UIViewController *)findCurrentShowingViewControllerFrom:(UIViewController *)vc  
{  
    // 递归方法 Recursive method  
    UIViewController *currentShowingVC;  
    if ([vc presentedViewController]) {  
        // 当前视图是被presented出来的  
        UIViewController *nextRootVC = [vc presentedViewController];  
        currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];  

    } else if ([vc isKindOfClass:[UITabBarController class]]) {  
        // 根视图为UITabBarController  
        UIViewController *nextRootVC = [(UITabBarController *)vc selectedViewController];  
        currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];  

    } else if ([vc isKindOfClass:[UINavigationController class]]){  
        // 根视图为UINavigationController  
        UIViewController *nextRootVC = [(UINavigationController *)vc visibleViewController];  
        currentShowingVC = [self findCurrentShowingViewControllerFrom:nextRootVC];  

    } else {  
        // 根视图为非导航类  
        currentShowingVC = vc;  
    }  

    return currentShowingVC;  
}