Objective c UIButton addTarget方法…不工作？

我有一个类变量，它是

UIActionSheet

的一个实例，名为actionSheet。我添加了

UIPickerView

的实例以及

UISegmentedControl

的实例。尽管当我点击“完成”按钮（UISegmentedControl的实例）时，我的类方法dismissActionSheet从未被调用。有人能帮我吗

//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

-(IBAction)chooseTopicButtonPressed{


    actionSheet = [[UIActionSheet alloc] initWithTitle:nil
                                                             delegate:nil
                                                    cancelButtonTitle:nil
                                               destructiveButtonTitle:nil
                                                    otherButtonTitles:nil];

    [actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

    CGRect pickerFrame = CGRectMake(0, 40, 0, 0);

    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
    pickerView.showsSelectionIndicator = YES;
    pickerView.dataSource = singlePicker.dataSource;
    pickerView.delegate = singlePicker.delegate;

    [actionSheet addSubview:pickerView];


    UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Done"]];
    closeButton.momentary = YES;
    closeButton.frame = CGRectMake(10, 6, 300, 30);
    closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
    closeButton.tintColor = [UIColor blueColor];
    [closeButton addTarget:self action:@selector(dismissActionSheet:) forControlEvents:UIControlEventTouchUpInside];


    //dismissActionSheet NOT BEING CALLED FOR SOME REASON!!! 

    [actionSheet addSubview:closeButton];

    [actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];

    [actionSheet setBounds:CGRectMake(0, 0, 320, 485)];
}


-(void)dismissActionSheet{
    NSLog(@"dismissActionSheet called");
    [actionSheet dismissWithClickedButtonIndex:0 animated:YES];

}

---

方法

dismissActionSheet

没有任何参数，因此

@选择器应如下所示：

[closeButton addTarget:self action:@selector(dismissActionSheet) forControlEvents:UIControlEventTouchUpInside];

这是对控制的大量滥用。
ui操作表
用于显示按钮菜单。
UISegmentedControl
实际上并不打算用作常规案例按钮。总有一天，苹果可能会更新
UIActionSheet
的实现，而每一个错误使用它的人都会遇到很多问题。尝试使用真正的UIButton而不是
UISegmentedControl
，或者尝试使用
UIActionSheet
中的一个按钮。