ios - 如何关闭操作表中显示的 UIPicker？

Question

我有一个带有 5 个静态单元格的 TableView Controller ，其中一个像这样调用 UIPicker:

#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 已呈现，但当我单击“完成”按钮时，但现在如何将其关闭？另外，该城市正在记录空，我不确定为什么，因为我用这些城市初始化了选择器，并且一旦呈现，它们就会出现在选择器中。

Answer 1

将对 UIActionSheet 的引用存储在属性或实例变量中

@property (nonatomic) UIActionSheet *actionSheet;

当您创建操作表时使用

self.actionSheet

而不是

UIActionSheet *aac

然后调用

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