在iOS 5中是否有标准的方法来执行删除确认，如联系人？

Question

在iOS 5中是否有标准方式显示删除确认，如此截图中所示？

如果没有标准方法，任何解决方案都会很好。

Answer 1

这是一个带有破坏性按钮的UIActionSheet。请参阅the documentation。

e.g。

// Create the action sheet
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil 
                                                   delegate:self 
                                          cancelButtonTitle:@"Cancel" 
                                     destructiveButtonTitle:@"Delete" 
                                         otherButtonTitles:nil];

...

- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
    if (buttonIndex == actionSheet.destructiveButtonIndex) {
        // Do the delete
    }
}

Answer 2

您可以使用UIActionSheet，如下所示。

UIActionSheet *actionSheet = [UIActionSheet alloc] initWithTitle:@"Confirm" delegate:aDelegate cancelButtonTitle:nil destructiveButtonTitle:@"Delete" otherButtonTitles:@"Cancel", nil];
[actionSheet showFromRect:aRect inView:aView animated:YES];

Answer 3

在iOS 8中不推荐使用

UIActionSheet。请使用UIAlertController，首选样式为UIAlertControllerStyleActionSheet。

// Create a new alert, with an (optional) title and message
UIAlertController* alert = [UIAlertController alertControllerWithTitle:nil
                                                               message:nil
                                                        preferredStyle:UIAlertControllerStyleActionSheet];


// When style is set to UIAlertActionStyleDestructive, the button appears with red text
UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"Delete"
                                                       style:UIAlertActionStyleDestructive
                                                     handler:^(UIAlertAction * action) {                                     
                                                          // ========
                                                          // Perform your delete operation here...
                                                          // ========
                                                      }];


// This cancel action will appear separated from the rest of the items
UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel"
                                                       style:UIAlertActionStyleCancel
                                                     handler:^(UIAlertAction * action) {}];


// Add the actions to the alert
[alert addAction:deleteAction];
[alert addAction:cancelAction];

// Present the sheet.
[self presentViewController:alert animated:YES completion:nil];

我通常会省略删除确认的标题和消息字段，因为我发现iOS上的内置应用程序（如联系人，消息，邮件等）通常不会使用这些字段。按钮说明了一切。

Answer 4

请参阅该UI组件的文档：UIActionSheet和UIActionSheetDelegate