UIDatePicker沒有顯示在iPad上的靜態tableView中

Question

我有一個表格視圖，顯示了一個模式中有幾個顯示開始日期和結束日期的靜態單元格。

當我點擊它們時，我想讓UIDatePicker顯示出來。目前，當我點擊該行時沒有任何反應。我錯過了什麼？

這裏是我的didSelectRowAtIndexPath方法：

- (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

愚蠢的錯誤。我有pickerView財產在我的頭文件設置爲弱，而不是強：

這樣的：

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

實際上應該是這樣的：

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