如何在UIActivityViewController

Question

为了澄清这一点，我不想添加新活动或自定义按钮进行分享。 我想添加一个新的操作按钮作为Cancel选项。见附件。

我正在使用这样的UIActivityViewController。

UIActivityViewController * avc = [[UIActivityViewController alloc] initWithActivityItems:shareItems applicationActivities:nil];
NSArray *excludeActivities = @[UIActivityTypePrint,
                               UIActivityTypeAssignToContact,
                               UIActivityTypeSaveToCameraRoll,
                               UIActivityTypePostToWeibo];

avc.excludedActivityTypes = excludeActivities;
[avc setCompletionWithItemsHandler:^(UIActivityType  _Nullable activityType, BOOL completed, NSArray * _Nullable returnedItems, NSError * _Nullable activityError) {
    //something
}];
[self presentViewController:avc animated:YES completion:nil];

这个想法是添加一个额外的按钮，例如Done按钮