UIButton addTarget方法...不工作？

我有一個類變量，是的UIActionSheet一個實例，稱爲actionSheet。我添加了一個UIPickerView的實例以及一個UISegmentedControl的實例。雖然當我點擊「完成」按鈕（UISegmentedControl的實例）時，我的類方法dismissActionSheet永遠不會被調用。誰能幫我嗎？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]; 

}

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2012-11-06 Skyler

這是一個很大的控制濫用。 'UIActionSheet'是爲了顯示一個按鈕菜單。 'UISegmentedControl'並不是真的用作一般情況下的按鈕。其中一天，蘋果可能會更新「UIActionSheet」的實現，並且每個使用錯誤方式的人都會遇到很多問題。嘗試使用真正的UIButton而不是'UISegmentedControl'或嘗試使用'UIActionSheet'中的某個按鈕。 – rmaddy

dismissActionSheet沒有任何參數，以便在@selector應該是如下的方法：

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

來源

2012-11-06 22:19:35 user427969

UIButton addTarget方法...不工作？

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