Xcode UIAlertController触点工作不正常

我在UIAlertController中添加了picker视图，但它的触碰并没有作用于整个picker，而只是作用于picker的某些特定部分。请帮我解决这个问题

代码：

if (IS_IOS8_AND_UP) {

    UIAlertController * searchActionSheet=[UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];

    [searchActionSheet.view setBounds:CGRectMake(8, 180, self.viewSize.width, sheetHeight)];

//aView.frame=cgrectmake100100，aView.frame.size.width，aView.frame.size.height

  //yourView represent the view that contains UIPickerView and toolbar

[searchActionSheet.view添加子视图：aView]； //[[self-topViewController].view-addSubview:searchActionSheet.view]； [[self-topViewController]presentViewController:searchActionSheet动画：是完成：无]

}
else
{
    _actionSheet = [[UIActionSheet alloc] initWithTitle:paddedSheetTitle delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
    [_actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
    [_actionSheet addSubview:aView];
    [self presentActionSheet:_actionSheet];
    _actionSheet.bounds = CGRectMake(0, 0, self.viewSize.width, sheetHeight);
}

见图片

UIAlertController * searchActionSheet=[UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"" style:UIAlertActionStyleDefault handler:nil]; 
[searchActionSheet addAction:alertAction];
[searchActionSheet addAction:alertAction];
[searchActionSheet addAction:alertAction];
[searchActionSheet addSubview:picker];

将alertAction对象添加到alertcontroller，正如我在上面添加的那样。之后，尝试将选择器作为子视图添加到alertcontroller

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根据需要添加尽可能多的alertAction对象以调整视图。不知道这是否是正确的方法，但它对我起了作用。

UIAlertController的文档说明此类的视图层次结构是私有的，不能修改。