Ios 如何解雇行动表中的UIPicker？

我有一个带有5个静态单元格的表视图控制器，其中一个调用UIPicker，如下所示：

#pragma mark PickerView DataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    return [self.cityNames count];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [self.cityNames objectAtIndex:row];
}

#pragma mark PickerView Delegate
-(void)presentNewPicker{
    UIActionSheet *aac = [[UIActionSheet alloc] initWithTitle:@"For which city?"
                                                     delegate:self
                                            cancelButtonTitle:nil
                                       destructiveButtonTitle:nil
                                            otherButtonTitles:nil];


    self.pickrView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 44.0, 0.0, 0.0)];
    self.pickrView.showsSelectionIndicator = YES;
    self.pickrView.dataSource = self;
    self.pickrView.delegate = self;

    self.cityNames = [[NSArray alloc] initWithObjects: @"Akron", @"Indie", @"Springfield", @"Loria", @"Merida", nil];


    UIToolbar *pickerDateToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    pickerDateToolbar.barStyle = UIBarStyleBlackOpaque;
    [pickerDateToolbar sizeToFit];

    NSMutableArray *barItems = [[NSMutableArray alloc] init];

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    [barItems addObject:flexSpace];

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDoneClick)];
    [barItems addObject:doneBtn];

    [pickerDateToolbar setItems:barItems animated:YES];

    [aac addSubview:pickerDateToolbar];
    [aac addSubview:self.pickrView];
    [aac showInView:self.view];
    [aac setBounds:CGRectMake(0,0,320, 464)];
}

-(void) dismissActionSheet:(id)sender {
NSLog(@"dismissActionSheet");

UIActionSheet *actionSheet =  (UIActionSheet *) ??? how do i get action sheet? :-);
[actionSheet dismissWithClickedButtonIndex:0 animated:YES];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    self.myCity.text = [self.cityNames objectAtIndex:row];
    NSLog(@"city %@", self.myCity.text);
}

---

UIPicker会出现，但当我单击“完成”按钮时，现在如何取消它？此外，城市记录为null，我不知道为什么，因为我用这些城市初始化了选取器，它们在出现时确实出现在选取器中。

将对UIActionSheet的引用存储在属性或实例变量中

@property (nonatomic) UIActionSheet *actionSheet;

创建操作表时，请使用

self.actionSheet

而不是

UIActionSheet *aac

然后打电话

[self.actionSheeet dismissWithClickedButtonIndex:0 animated:YES];

---

让它全球化

这是我的第一本能，但后来我发现这一点，并试图让它发挥作用。但是我无法让OK按钮显示：

http://stackoverflow.com/questions/7464302/obj-c-showing-a-uipickerview-in-an-uiactionsheet-but-need-to-save-to-nsuserdef

我不确定问题出在哪里-你想显示什么“确定”按钮？我链接到的那篇文章中的那个按钮，是他们创建的actionsheet的其他按钮。

UIActionSheet *aac;