在删除UITableView单元格之前发出警报 – (UIAlertController)Swift或Objective-C

我想删除一个表视图单元格,但在该操作发生之前,我想给用户一个警报视图.我懂了：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning"
                                                        message:@"Are you sure?"
                                                       delegate:self
                                              cancelButtonTitle:@"NO"
                                              otherButtonTitles:@"YES",nil];
        [alert show];
 
        [self.array removeObjectAtIndex:indexPath.row];//or something similar to this based on your data source array structure
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
}
 
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if([title isEqualToString:@"Nee"])
    {
        NSLog(@"Nothing to do here");
    }
    else if([title isEqualToString:@"Ja"])
    {
        NSLog(@"Delete the cell");
 
    }
}

但是现在当我在单元格上向右滑动并且删除按钮出现时,我没有AlertView.当我按下删除按钮时,我只获得AlertView.当我按下删除按钮时,会出现消息,但单元格已被删除.

如何使这项工作？所以当我滑动时有一个AlertView.

关于序列,一切都很好.只有在按下删除按钮时才会调用commitEditingStyle.关键是你实际上在响应警报之前删除了对象.把它改成这个：

在@implementation之前将其添加到.m文件中：

@interface PutYourViewControllerClassNameHere
@property (strong,nonatomic) NSIndexPath *indexPathToBeDeleted;
@end

然后：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
 
        self.indexPathToBeDeleted = indexPath;
 
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning"
                                                        message:@"Are you sure?"
                                                       delegate:self
                                              cancelButtonTitle:@"NO"
                                              otherButtonTitles:@"YES",nil];
        [alert show];
        // do not delete it here. So far the alter has not even been shown yet. It will not been shown to the user before this current method is finished.     
    }
}
 
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    // This method is invoked in response to the user's action. The altert view is about to disappear (or has been disappeard already - I am not sure) 
 
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if([title isEqualToString:@"NO"])
    {
        NSLog(@"Nothing to do here");
    }
    else if([title isEqualToString:@"YES"])
    {
        NSLog(@"Delete the cell");
 
        [self.array removeObjectAtIndex:[self.indexPathToBeDeleted row]];
        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:self.indexPathToBeDeleted] withRowAnimation:UITableViewRowAnimationFade];
    }
}

编辑：这应该编译,尽管可能有轻微的语法错误.一般说法：您只处理一个部分.至少只有删除内的一个部分是可能的.

在删除UITableView单元格之前发出警报 – (UIAlertController)Swift或Objective-C

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