iOS 9.0 - 从UIAlertController操作表中删除顶部栏

Question

在创建一个动作表时UIAlertController,我看到一个顶部栏总是显示.这篇SO帖子建议将标题设置为nil- 这可能适用于iOS 8.0,但我在iOS 9.0上看到了一个顶级栏.

Answer 1

设置message为nil:

UIAlertController *actionSheet= [UIAlertController
                                 alertControllerWithTitle:nil
                                 message:nil
                                 preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *actionSheetButton1 = [UIAlertAction
                                     actionWithTitle:@"Button 1"
                                     style:UIAlertActionStyleDefault
                                     handler:^(UIAlertAction * action)
                                     {
                                         NSLog(@"Button 1 pressed");
                                     }];
UIAlertAction *actionSheetButton2 = [UIAlertAction
                                     actionWithTitle:@"Button 2"
                                     style:UIAlertActionStyleDefault
                                     handler:^(UIAlertAction * action)
                                     {
                                         NSLog(@"Button 2 pressed");
                                     }];
UIAlertAction *actionSheetButton3 = [UIAlertAction
                                     actionWithTitle:@"Close Button"
                                     style:UIAlertActionStyleCancel
                                     handler:^(UIAlertAction * action)
                                     {
                                         NSLog(@"Close Button pressed");
                                     }];

[actionSheet addAction:actionSheetButton1];
[actionSheet addAction:actionSheetButton2];
[actionSheet addAction:actionSheetButton3];
[self presentViewController:actionSheet animated:YES completion:nil];