如何在操作表中添加日期选择器？

- (IBAction) showCatPicker {

    if (self.catList !=nil) {
        self.catList=nil;
        [catList release];
    }
    self.catList =  [[NSMutableArray alloc] init];

        self.actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];   
    [self.actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

    CGRect pickerFrame = CGRectMake(0, 40, 0, 0);   
    if(self.catPicker == nil) {     
        self.catPicker = [[UIPickerView alloc] initWithFrame:pickerFrame];

        self.catPicker.showsSelectionIndicator = YES;
        self.catPicker.dataSource = self;
        self.catPicker.opaque = YES;
        self.catPicker.multipleTouchEnabled = YES;
        self.catPicker.userInteractionEnabled = YES;
        self.catPicker.delegate = self;     
    }

    [self.actionSheet addSubview:self.catPicker];

    UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Select"]];
    closeButton.momentary = YES; 
    closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
    closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
    closeButton.tintColor = [UIColor colorWithRed:19.0/255 green:122.0/255 blue:53.0/255 alpha:1.0];
    [closeButton addTarget:self action:@selector(dismissGenderPicker:) forControlEvents:UIControlEventValueChanged];

    UISegmentedControl *cancelButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Cancel"]];
    cancelButton.momentary = YES; 
    cancelButton.frame = CGRectMake(10, 7.0f, 50.0f, 30.0f);
    cancelButton.segmentedControlStyle = UISegmentedControlStyleBar;
    cancelButton.tintColor = [UIColor colorWithRed:19.0/255 green:122.0/255 blue:53.0/255 alpha:1.0];
    [cancelButton addTarget:self action:@selector(cancelActionSheet) forControlEvents:UIControlEventValueChanged];

    [self.actionSheet addSubview:cancelButton]; 
    [self.actionSheet addSubview:closeButton];

    [cancelButton release]; 
    [closeButton release];  
    [self.actionSheet showInView:self.view];    
    [self.actionSheet setBounds:CGRectMake(0, 0, 320, 485)];
    [catPicker reloadComponent:0];
}

您绝对不应该使用 UIActionSheet 来保存 UIDatePicker，因为此功能已被弃用！

来自文档 https://developer.apple.com/library/ios/documentation/uikit/reference/uiactionsheet_class/index.html:

子类化注释

UIActionSheet 并非设计为子类化，也不应添加 其层次结构的视图。如果您需要提供包含更多内容的表格 除了 UIActionSheet API 提供的定制之外，您还可以创建 你自己的并以模态方式呈现它 PresentViewController：动画：完成：。

and

重要提示：UIActionSheet 在 iOS 8 中已弃用。（请注意 UIActionSheetDelegate 也已弃用。）创建和管理操作 iOS 8 及更高版本中的工作表，请改为使用 UIAlertController 和 UIAlertControllerStyleActionSheet 的首选样式。

您可以很容易地做的是创建一个 UIView 来保存 UIDatePicker 并根据需要对视图进行动画处理。如果需要，您甚至可以向其中添加 UIToolbar。

这是一个例子：

创建两个属性：

@property (strong, nonatomic) UIDatePicker *theDatePicker;
@property (strong, nonatomic) UIView *pickerView;

创建您的选择器，将其嵌入到UIView并显示：

    -(void) createDatePickerAndShow {

        UIToolbar *controlToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, pickerView.bounds.size.width, 44)];

        [controlToolbar sizeToFit];

        UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

        UIBarButtonItem *setButton = [[UIBarButtonItem alloc] initWithTitle:@"Set" style:UIBarButtonItemStyleDone target:self action:@selector(dismissDateSet)];

        UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target:self action:@selector(cancelDateSet)];

        [controlToolbar setItems:[NSArray arrayWithObjects:spacer, cancelButton, setButton, nil] animated:NO];


        [theDatePicker setFrame:CGRectMake(0, controlToolbar.frame.size.height - 15, theDatePicker.frame.size.width, theDatePicker.frame.size.height)];

        if (!pickerView) {
            pickerView = [[UIView alloc] initWithFrame:theDatePicker.frame];
        } else {
            [pickerView setHidden:NO];
        }


        CGFloat pickerViewYpositionHidden = self.view.frame.size.height + pickerView.frame.size.height;

        CGFloat pickerViewYposition = self.view.frame.size.height - pickerView.frame.size.height;

        [pickerView setFrame:CGRectMake(pickerView.frame.origin.x,
                                        pickerViewYpositionHidden,
                                        pickerView.frame.size.width,
                                        pickerView.frame.size.height)];
        [pickerView setBackgroundColor:[UIColor whiteColor]];
        [pickerView addSubview:controlToolbar];
        [pickerView addSubview:theDatePicker];
        [theDatePicker setHidden:NO];


        [self.view addSubview:pickerView];

        [UIView animateWithDuration:0.5f
                         animations:^{
                             [pickerView setFrame:CGRectMake(pickerView.frame.origin.x,
                                                             pickerViewYposition,
                                                             pickerView.frame.size.width,
                                                             pickerView.frame.size.height)];
                         }
                         completion:nil];

    }

And to dismiss the DatePicker:

    -(void) cancelDateSet {    
    CGFloat pickerViewYpositionHidden = self.view.frame.size.height + pickerView.frame.size.height;    

        [UIView animateWithDuration:0.5f
                         animations:^{
                             [pickerView setFrame:CGRectMake(pickerView.frame.origin.x,
                                                             pickerViewYpositionHidden,
                                                             pickerView.frame.size.width,
                                                             pickerView.frame.size.height)];
                         }
                         completion:nil];
    }