UIAlertController 导致不调用 UITableViewCell-Deletion 的 RowAnimation答案

【问题标题】：UIAlertController causes RowAnimation of a UITableViewCell-Deletion not to be calledUIAlertController 导致不调用 UITableViewCell-Deletion 的 RowAnimation
【发布时间】：2016-05-22 05:33:46
【问题描述】：

我尝试在用户删除信息之前集成警报。没有动画，行删除是动画的并且工作正常。但在 UIAlertAction 处理程序中，动画不再起作用：

  UIAlertController* alert = [UIAlertController alertControllerWithTitle:nil
                                                                   message:@"Are you sure you want to delete the Inforamtion?"
                                                            preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"Delete" style:UIAlertActionStyleDestructive
                                                          handler:^(UIAlertAction * action) {

                                                              // Find the cell taped Item using the position  of the sender as located at relative to the tableview
                                                              CGPoint buttonPosition = [deleteTapped convertPoint:CGPointZero toView:self.tableView];
                                                              NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];

                                                              // Update the data model
                                                              [self.checkout.paymentMethods removeObjectAtIndex:(indexPath.row -1)];

                                                              // Delete the row from the tableview
                                                              [self.tableView beginUpdates];
                                                              [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:(UITableViewRowAnimationFade)];
                                                              [self.tableView endUpdates];


                                                          }];

    [alert addAction:deleteAction];

    UIAlertAction* keepAction = [UIAlertAction actionWithTitle:@"Keep" style:UIAlertActionStyleDefault
                                                         handler:^(UIAlertAction * action) {

                                                         }];



 [alert addAction:keepAction];

 [self presentViewController:alert animated:YES completion:nil];

有什么建议可以让动画再次工作吗？

【问题讨论】：

标签： ios objective-c uitableview animation uialertcontroller

【解决方案1】：

我认为 begin 和 endUpdate 调用引起了问题。请罗马他们应该工作。

这样使用：

UIAlertController* alert = [UIAlertController alertControllerWithTitle:nil
                                                                   message:@"Are you sure you want to delete the Inforamtion?"
                                                            preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"Delete" style:UIAlertActionStyleDestructive
                                                          handler:^(UIAlertAction * action) {

                                                              // Find the cell taped Item using the position  of the sender as located at relative to the tableview
                                                              CGPoint buttonPosition = [deleteTapped convertPoint:CGPointZero toView:self.tableView];
                                                              NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];

                                                              // Update the data model
                                                              [self.checkout.paymentMethods removeObjectAtIndex:(indexPath.row -1)];

                                                              // Delete the row from the tableview
                                                              [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];


                                                          }];

    [alert addAction:deleteAction];

    UIAlertAction* keepAction = [UIAlertAction actionWithTitle:@"Keep" style:UIAlertActionStyleDefault
                                                         handler:^(UIAlertAction * action) {

                                                         }];



 [alert addAction:keepAction];

【讨论】：

我试过了，但这不是导致问题的原因。点击删除后，tableview 更新，单元格消失，没有动画。