objective-c – 如何使用关闭按钮关闭UIActionSheet并避免崩溃？

[actionSheet dismissWithClickedButtonIndex:0 animated:YES];

使用关闭按钮关闭uiactionsheet,如下所述：

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithtitle:nil 
                                                         delegate:nil
                                                cancelButtontitle:nil
                                           destructiveButtontitle:nil
                                                otherButtontitles:nil];

[actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

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

UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
pickerView.showsSelectionInDicator = YES;
pickerView.datasource = self;
pickerView.delegate = self;


[actionSheet addSubview:pickerView];
[pickerView release];

UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Close"]];
closeButton.momentary = YES; 
closeButton.frame = CGRectMake(260,7.0f,50.0f,30.0f);
closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
closeButton.TintColor = [UIColor blackColor];
[closeButton addTarget:self action:@SELEctor(dismissActionSheet:) forControlEvents:UIControlEventValueChanged];
[actionSheet addSubview:closeButton];


[actionSheet dismissWithClickedButtonIndex:0 animated:YES];


[closeButton release];


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

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

但是,我不知道在哪里放置这一行,假设这将解决我的问题：

[actionSheet dismissWithClickedButtonIndex:0 animated:YES];

此外,当我单击关闭按钮时,应用程序崩溃,并显示错误消息“PROGRAM RECEIVED ERROR messaGE SIGBRT”.我认为我的两个问题是相关的.有帮助吗？