重新加载UIAlertView中的UIPickerView

Question

我使用以下代码在UIAlertView中创建了一个UIPickerView：

alert1 = [[UIAlertView alloc] initWithFrame:CGRectMake(0, 0, 300, 200)];
alert1.title = @"All Notes";
alert1.message = @"\n\n\n\n\n\n\n";
alert1.delegate = self;
[alert1 addButtonWithTitle:@"Cancel"];

 myPickerView = [[UIPickerView alloc] initWithFrame:CGRectZero];
 myPickerView.tag = TAG_PICKER0;
 myPickerView.delegate = self;
 myPickerView.showsSelectionIndicator = YES;
 myPickerView.autoresizingMask = UIAlertViewStyleDefault;
 myPickerView.frame = CGRectMake(10, 40, 265, 150);

 [alert1 addSubview:myPickerView];
 [alert1 show];

我想在按下按钮时重新加载此pickerView，在按钮操作中我向拾取器中出现的数组添加了一个新元素，我也添加了这一行

[self.myPickerView reloadAllComponents];
self.myPickerView.delegate=self;

但此时新元素不会出现在选择器中，当我重新打开应用程序时会出现

我怎样才能解决这个问题，使新元素在添加时出现在pickerView中？