小编fol*_*ben的帖子

如果我在a中有一个带有排除路径的TextView,UITableViewCell我如何计算给定字符串的单元格高度？

我已经使用iOS 5中新的UIViewController容器视图控制器方法创建了一个自定义容器视图控制器.

麻烦的是,即使我的容器控制器的子UIViewController有definesPresentationContext = YES,当它创建并呈现另一个模态视图控制器时,UIKit将容器(而不是子容器)设置为呈现控制器.

例如,在MyChildViewController.m中:

- (void)showMailComposeView:(id)sender {

    __block MFMailComposeViewController *vc =
            [[MFMailComposeViewController alloc] init];
    vc.mailComposeDelegate = self;
    vc.subject = @"Subject";

    self.definesPresentationContext = YES;

    [self presentViewController:vc animated:YES completion:^{

       if ([self.modalViewController isEqual:vc])
            NSLog(@"This should print...");

       if ([vc.presentingViewController isEqual:self.parentViewController])
            NSLog(@"... but this shouldn't");

       // NOTE: Both log statements printed

    }];
}

- (void)mailComposeController:(MFMailComposeViewController*)controller
          didFinishWithResult:(MFMailComposeResult)result
                        error:(NSError*)error
{ 
    [self dismissViewControllerAnimated:YES completion:^{}];

    // NOTE: self.parentViewController.view now displays instead of self.view
}

我哪里错了？

我如何确保在模态视图被解除时(而不是容器视图)显示的子视图？