Question

自iOS 11以来，我在UITableView删除操作上遇到了一个奇怪的问题。

这是相关的TableView代码：

@implementation ChatMessageListViewController(TableView)

#pragma mark - table view datasource/delegate
- (NSArray<UITableViewRowAction *> *) tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(nonnull NSIndexPath *)indexPath{
    NSMutableArray *rowActions = [NSMutableArray array];

    UITableViewRowAction *delete = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDestructive title:@"Delete" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {
        [self deleteMessageAtIndexPath:indexPath];
    }];
    delete.backgroundColor = [UIColor redColor];
    [rowActions addObject:delete];
    return [rowActions copy];
}

- (void) deleteMessageAtIndexPath:(NSIndexPath *)indexPath {
    NSString *threadID = [[self.messageArray objectAtIndex:indexPath.row] objectForKey:@"threadID"];
    [self.tableView beginUpdates];
    [self.messageArray removeObjectAtIndex:indexPath.row];
    [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    [self.tableView endUpdates];

    @weakify(self);
    [UIUtil showLoadingHudWithText:WELocalString(@"message_remove_thread_loading_text", @"Deleting...", @"删除中...")];
    [[AsyncUtil sharedInstance] dispatch_background_network:^{
        DBManager *db = [[DBManager alloc] init];
        [db deletetableData:[NSString stringWithFormat:@"singleChat WHERE threadID = '%@' ",threadID] ];
        [[MemChatThreadMessages sharedInstance] removeThread:threadID];
        NSDictionary * result = [Network deleteChatThread:threadID forEmail:[WEUtil getEmail]];
        [[AsyncUtil sharedInstance] dispatch_main:^{
            [UIUtil hideLoadingHuds];
            @strongify(self);
            if(self == nil) return ;

            if([result[@"result"] isEqualToString:@"success"]){
            }else{
                [UIUtil showErrorMessage:WELocalString(@"message_remove_thread_error", @"Cannot delete this thread", @"不能删除该会话！")];
            }
            [self.tableView reloadData];
        }];
    }];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return [self.messageArray count];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    NSDictionary *messageInfo = [self.messageArray objectAtIndex:indexPath.row];
    if ([(NSString *)[messageInfo objectForKey:@"isAnnouncement"] isEqualToString:@"1"]) {
        return 80;
    }else if ([[messageInfo objectForKey:@"chatTag"] isValidString]){
        return 80;
    }else if([self isSpecialMessage:messageInfo]){
        return 80;
    }else{
        return 67;
    }
}

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *CellIdentifier = @"message";
    if(self.events == nil){
        NSDictionary * d = [WEUtil getMyEventListCache];
        self.events = [[NSMutableDictionary alloc] init];
        for(NSDictionary * eventSummary in d[@"events"]){
            NSString * eventID = eventSummary[@"eventid"];
            [self.events setObject:eventSummary forKey:eventID];
        }
    }
    UserMessageTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil){
        cell = [[UserMessageTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                               reuseIdentifier:CellIdentifier];
    }
    if(indexPath.row >= [self.messageArray count]){
        TERMINATE_WITH_NIL_CELL;
    }

    NSDictionary *messageInfo = [self.messageArray objectAtIndex:indexPath.row];

    if(![self isSpecialMessage:messageInfo]){
        [cell configureCellWithMessageDict:messageInfo];
    }else{
        [cell configureCellWithNewMessageDict:messageInfo withEvents:self.events];
    }

    return cell;
}

#pragma mark - Navigation

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSDictionary *msgThreadDict = [self.messageArray objectAtIndex:indexPath.row];
    if(![self isSpecialMessage:msgThreadDict]){
        [self tableView:tableView didSelectNormalRowAtIndexPath:indexPath];
    }else{
        NSString * event = msgThreadDict[@"event"];
        if([event isValidString]){
            if([event isEqualToString:@"no_event_messages"]){
                [UIUtil showErrorMessage:@"no event id"];
            }else{
                [BackendTracking trackingWithAction:@"open_special" withLabel:@"threads_list"];
                SpecialTopicListViewController * special = [[SpecialTopicListViewController alloc] init];
                special.tracking_src = @"tab";
                [self.navigationController pushViewController:special animated:YES];
            }
        }
    }
}

-(void) tableView:(UITableView *)tableView didSelectNormalRowAtIndexPath:(NSIndexPath *)indexPath{
    NSDictionary *msgThreadDict = [self.messageArray objectAtIndex:indexPath.row];
    NSString *threadID = [msgThreadDict objectForKey:@"threadID"];
    NSString *jid = [msgThreadDict objectForKey:@"jid"];
    [GATracking trackCategory:@"message" withAction:@"thread_list_item_click" withLabel:threadID];
    [[MemChatThreadMessages sharedInstance] setCurrentThreadID:threadID];
    PrivateMessageViewController * chatVC = [[PrivateMessageViewController alloc] init];
    chatVC.threadID = threadID;
    chatVC.targetJID = jid;
    chatVC.targetName = [msgThreadDict objectForKey:@"name"];
    chatVC.unreadMsgNumber = [[self.messageArray objectAtIndex:indexPath.row][@"unreadCnt"] integerValue];

    if ([(NSString *)[msgThreadDict objectForKey:@"isGroup"] isEqualToString:@"1"]) {
        chatVC.isGroup = YES;
    }else{
        chatVC.isGroup = NO;
    }
    chatVC.src = @"list";
    WELogInfo(@"click message");
    [self.navigationController pushViewController:chatVC animated:YES];
}
@end

使用这些拖尾滑动操作进行更新和更改后，每次删除条目之前都会附加另一个视图（直到它不再起作用）。我已经尝试禁用完整的跟踪或实现iOS 11 trailingSwipeActionsConfigurationForRowAtIndexPath但到目前为止我无法解决此问题。

你在代码中看到了什么问题吗？主控制器代码在另一个文件中。

Answer 1

在此行之后删除后尝试重新加载 [self.tableView endUpdates]; 我认为你从messageArray中删除了数据但是因为你没有在那之后重新加载所以表视图计数仍然是2并且你正在重新加载块可能需要时间。

还有一件事你已经从messageArray中删除了数据，然后从db中删除了，所以如果你无法从db中删除它，你显示它没有被删除但是对于用户它将被删除，因为它不再在消息数组中

Buggy滑动以在每次删除后删除另一行上的显示

1 个答案: