SLComposeViewController出现得很慢

Question

SLComposeViewController在展示后需要3-4秒才会出现。但是presentViewController:(UIViewController *) animated:(BOOL) completion:^(void)completion方法完成块会立即被调用。因此，即使我使用加载指示器，它也会在一眨眼的时间内消失。相关代码如下。顺便说一句，我试过dispatch_async，它不起作用。

我怎样才能加快这个过程?你有什么想法吗？

SLComposeViewController *shareView = [SLComposeViewController composeViewControllerForServiceType: SLServiceTypeFacebook];
[shareView setTitle:@"Title"];
[shareView setInitialText:@"Description"];
[shareView addURL:[NSURL URLWithString:@"http://www.google.com/"]];
[shareView setCompletionHandler:^(SLComposeViewControllerResult result) {

    switch (result) {
        case SLComposeViewControllerResultCancelled:
        {
            NSLog(@"Facebook Post Canceled");
            break;
        }
        case SLComposeViewControllerResultDone:
        {
            NSLog(@"Facebook Post Successful");
            break;
        }
        default:
            break;
    }
}];

UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
activityView.center = CGPointMake([UIScreen mainScreen].bounds.size.width / 2.0, [UIScreen mainScreen].bounds.size.height / 2.0);
[activityView startAnimating];
[self.view addSubview:activityView];

[self presentViewController:shareView animated:YES completion:^{
    NSLog(@"Presented facebook");
    [activityView removeFromSuperview];
}];

Answer 1

所以，这不是一个解决办法，但它可能会帮助你。我不能让这个东西更快的出现，我想它只是实现在显示之前拉入数据。

由于presentViewController完成几乎是立即执行的，因此我的变通方法是显示进度视图，并将选择器设置为在2秒后执行。选择器只是隐藏了进度视图，下面是一个例子。

[MBProgressHUD showHUDAddedTo:self.view animated:YES];
[self performSelector:@selector(hideProgressView) withObject:nil afterDelay:2.0f];

[self presentViewController:self.composeViewController animated:YES completion:nil];


- (void)hideProgressView
{
    [MBProgressHUD hideHUDForView:self.view animated:YES];
}