UIButton addTarget方法...不工作？

问题描述：

我有一个类变量，是的UIActionSheet一个实例，称为actionSheet。我添加了一个UIPickerView的实例以及一个UISegmentedControl的实例。虽然当我点击“完成”按钮（UISegmentedControl的实例）时，我的类方法dismissActionSheet永远不会被调用。谁能帮我吗？UIButton addTarget方法...不工作？

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

-(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]; 

}

这是一个很大的控制滥用。 'UIActionSheet'是为了显示一个按钮菜单。 'UISegmentedControl'并不是真的用作一般情况下的按钮。其中一天，苹果可能会更新“UIActionSheet”的实现，并且每个使用错误方式的人都会遇到很多问题。尝试使用真正的UIButton而不是'UISegmentedControl'或尝试使用'UIActionSheet'中的某个按钮。 – rmaddy

答

dismissActionSheet没有任何参数，以便在@selector应该是如下的方法：

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

UIButton addTarget方法...不工作？

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