UIDatePicker 未显示在 iPad 上的静态 tableView 中

Question

我有一个表格视图以模态显示，其中有几个静态单元格显示开始日期和结束日期。

当我点击它们时，我希望 UIDatePicker 出现。目前，当我单击该行时没有任何反应。我错过了什么？

这是我的 didSelectRowAtIndexPath ：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {   
    UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
    self.pickerView.date = [self.dateFormatter dateFromString:selectedCell.detailTextLabel.text];

    //  check if date picker already on screen
    if (self.pickerView.superview == nil) {
        [self.view.window addSubview:self.pickerView];

        // size up the picker view to fit our screen and compute animation
        //
        //compute the start frame
        CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
        CGSize pickerSize = [self.pickerView sizeThatFits:CGSizeZero];
        CGRect startRect = CGRectMake(0.0, 
                                       screenRect.origin.y + screenRect.size.height, 
                                       pickerSize.width, 
                                       pickerSize.height
                                       );
        self.pickerView.frame = startRect;

        //computer end frame
        CGRect pickerRect = CGRectMake(0.0, 
                                       screenRect.origin.y + screenRect.size.height - pickerSize.height, 
                                       pickerSize.width, 
                                       pickerSize.height
                                       );
        // start the slide up animation
        [UIView beginAnimations:nil context:NULL];
            [UIView setAnimationDuration:0.3];

            // we need to perform some post operations after the animation is complete
            [UIView setAnimationDelegate:self];

            self.pickerView.frame = pickerRect;

            // shrink the table vertical size to make room for the date picker
            CGRect newFrame = self.tableView.frame;
            newFrame.size.height -= self.pickerView.frame.size.height;
            self.tableView.frame = newFrame;
        [UIView commitAnimations];

        // add the "Done" button to the nav bar
        self.navigationItem.rightBarButtonItem = self.doneButton;
    } }

Answer 1

愚蠢的错误。我在头文件中将 pickerView 属性设置为弱而不是强：

这个：

@property (weak, nonatomic) IBOutlet UIDatePicker *pickerView;

实际上应该是这样的：

 @property (strong, nonatomic) IBOutlet UIDatePicker *pickerView;