UIActivityViewController 混淆了标题

Question

我呈现一个这样的 UIActivityViewController：

CustomActivityItem* activityItem = [[CustomActivityItem alloc] initWithBody:self.feedItem.link andWithSubject:self.feedItem.title];
UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[activityItem] applicationActivities:nil];
[self presentViewController:activityViewController animated:YES completion:^{

}];

现在如果我按下分享按钮并选择“邮件”，那么主题不仅会显示在主题字段中。它也显示在我的标题中。我可以避免这种行为吗？！

Answer 1

自己解决了：

[activityViewController setCompletionHandler:^(NSString *activityType, BOOL completed) {
    // back to normal color
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"Header.png"] forBarMetrics:UIBarMetricsDefault];
}];
[self presentViewController:activityViewController animated:YES completion:^{
    [[UINavigationBar appearance] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
}];