是否有理由不能只使用 UIToolbar ？

Is there a reason you couldn't just use a UIToolbar?

UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame: CGRectMake(0.0, 0.0, 320.0, 44.0)];
UIBarButtonItem* cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemCancel
                                                                              target: self
                                                                              action: @selector(cancel)];
UIBarButtonItem* space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace
                                                                       target: nil
                                                                       action: nil];
UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemDone
                                                                            target: self
                                                                            action: @selector(done)];

NSMutableArray* toolbarItems = [NSMutableArray array];
[toolbarItems addObject:cancelButton];
[toolbarItems addObject:space];
[toolbarItems addObject:doneButton];
[cancelButton release];
[doneButton release];
[space release];
toolbar.items = toolbarItems;

然后只需将工具栏添加到视图。请确保正确定位并实施完成和取消选择器。

Then just add the toolbar to your view. Make sure to size it correctly and implement the done and cancel selectors.