当我在聊天室选择要删除的邮件后按删除按钮时，会触发以下代码。
- (void)deleteButtonPressed:(id)sender {
if (arrayToDelete.count) {
for (NSString *str in arrayToDelete) {
NSLog(@"msgID --> %@",str);
[self.chatModel.dataSource removeObject:str]; //??? Remove data from the screen
[[FMDBManager sharedInstance] deleteMessageByMessageId:str]; //??? Delete data from database
}
[arrayToDelete removeAllObjects];
[self.chatTableView reloadData];
}
}
此行成功删除聊天室中的所选邮件。
[self.chatModel.dataSource removeObject:str]; //??? Remove data from the screen
当我走出聊天室并重新进入时，这些消息仍然存在，所以我在下面有这一行。
[[FMDBManager sharedInstance] deleteMessageByMessageId:str]; //??? Delete data from database
我认为以上行应该从数据库中删除那些选定的消息，但是当我重新进入聊天室时，我仍然会看到这些消息。以下是相关代码。
- (void)deleteMessageByMessageId:(NSString *)messageId {
FMDatabase *db = [self getterDataBase];
[db open];
NSString *sqlString = [NSString stringWithFormat:@"DELETE FROM message WHERE messageId = '%@'",messageId];
BOOL status = [db executeUpdate:sqlString];
NSLog(@"Delete MessageById:%@ Status:%d",messageId,status);
[db close];
}
我发现当聊天室调用viewDidLoad时，它最终将调用callBackGetChannelLogNew方法，其中服务器将数据与聊天室tableview和本地数据库同步。
- (void)callBackGetChannelLogNew:(NSDictionary *)resultDataDic status:(enumAPI_STATUS)eAPI_STATUS {
if (isFirstTimeUpdate) {
}
if (eAPI_STATUS == API_STATUS_SUCCEE) {
NSString *readString=[NSString stringWithFormat:@"%@",resultDataDic[@"read_arr"]];
if ([readString isEqualToString:@""]) {
// NSLog(@"read_arr is empty");
}
else {
NSArray *read_arr=resultDataDic[@"read_arr"];
// Copy read_arr
self.readArray=[read_arr mutableCopy];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0),^{
[self dealWithReadArray:read_arr];
});
}
NSArray *data = [resultDataDic objectForKey:@"msg"];
if (data.count > 0) {
apiHaveData = YES;
} else {
apiHaveData = NO;
self.loadIngView.hidden = YES;
isLoadingData = NO;
return;
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0),^{
// Reverse order of data
NSArray* reversedArray = [[data reverseObjectEnumerator] allObjects];
NSMutableArray *messageFromOtherArray = [NSMutableArray new];
NSMutableArray *messageAllArray = [NSMutableArray new];
for (int i = 0; i < reversedArray.count; i++) {
NSDictionary *_dic = reversedArray[i];
NSString *fromId = [_dic objectForKey:@"fid"];
NSString *message = [NSString stringWithFormat:@"%@",[_dic objectForKey:@"say"]];
if ([ObjectManager getChatMessageKindWithString:message] == MessageTypeText) {
message = [ObjectManager decryptWithString:message];
}
NSString *messageId = [_dic objectForKey:@"mid"];
NSString *toId = [_dic objectForKey:@"tid"];
NSDateFormatter *_formatter = [[NSDateFormatter alloc] init];
_formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss.SSS";
NSDate *date_t = [NSDate dateWithTimeIntervalSince1970:[[_dic objectForKey:@"t"] doubleValue]/1000.0]; //換算成日期
NSString *stringDate = [_formatter stringFromDate:date_t];
NSString *sendDate = stringDate;
NSString *lid = _dic[@"lid"];
NSMutableDictionary *myDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:
fromId,@"fromId",
message,@"message",
messageId,@"messageId",
sendDate,@"sendDate",
toId,@"toId",
lid,@"lid",
nil];
NSString *isRead;
if (_chatRoomType == ChatRoomTypePrivate) {
if ([_dic[@"r"] intValue]) {
isRead = @"1";
myDic[@"isRead"] = isRead;
lastReadMessageId = [NSString stringWithFormat:@"%@",messageId];
}
}
if (i == 0) {
if (lidForAPI != [_dic[@"lid"] intValue]) {
lidForAPI = [_dic[@"lid"] intValue];
} else {
dispatch_async(dispatch_get_main_queue(), ^{
apiHaveData = NO;
self.loadIngView.hidden = YES;
isLoadingData = NO;
});
return ;
}
}
if (![myDic[@"fromId"] isEqualToString:[User sharedUser].account]) {
[messageFromOtherArray addObject:myDic];
}
if (_chatRoomType == ChatRoomTypeGroup) {
[myDic setObject:@"1" forKey:@"isGroupMessage"];
}
[myDic setObject:@"1" forKey:@"did_I_Read"];
[messageAllArray addObject:myDic];
}
dispatch_async(dispatch_get_main_queue(), ^{
[self setupViewWithMessageArray:messageAllArray]; //???? Here server sync-up data with tableview
});
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{
if (_chatRoomType == ChatRoomTypePrivate) {
if (messageFromOtherArray.count > 0 && isUplaodLastRead == NO) {
isUplaodLastRead = YES;
NSDictionary *lastReadMsgDic = messageFromOtherArray.lastObject;
[self callMsgReadAPI:lastReadMsgDic];
}
} else {
if (messageAllArray.count > 0 && isUplaodLastRead == NO) {
isUplaodLastRead = YES;
NSDictionary *lastReadMsgDic = messageAllArray.lastObject;
[self callMsgReadAPI:lastReadMsgDic];
}
}
self.chatModel.channelTopic = _topic;
NSArray *read_arr=resultDataDic[@"read_arr"];
[self dealMySendMessageReadedWithReadArray:read_arr AndMessageArray:messageAllArray];
[self saveMessageWithArray:messageAllArray]; //???? Here server sync-up data with local db
});
});
}
}
此行将数据从服务器同步到tableview
dispatch_async(dispatch_get_main_queue(), ^{
[self setupViewWithMessageArray:messageAllArray]; //???? Here server sync-up data with tableview
});
以下是方法setupViewWithMessageArray
- (void)setupViewWithMessageArray:(NSArray *)messageAllArray {
if (!isFirstTimeUpdate) {
isFirstTimeUpdate = YES;
self.chatModel.dataSource = nil;
[self.chatTableView reloadData];
self.chatModel.dataSource = [[NSMutableArray alloc] init];
[self addMessageWithArray:messageAllArray];
[self.chatTableView reloadData];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:self.chatModel.dataSource.count-1 inSection:0];
[self.chatTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:NO];
} else {
[self addMessageWithArray:messageAllArray];
[self reloadTableViewWithoutMove];
}
self.loadIngView.hidden = YES;
isLoadingData = NO;
if (_chatRoomType == ChatRoomTypePrivate) {
if (lastReadMessageId) {
[self.chatModel setPrivateChatListAllReadFormMessageId:lastReadMessageId];
}
}
}
此行将数据从服务器同步到本地数据库
[self saveMessageWithArray:messageAllArray]; //???? Here server sync-up data with local db
下面是方法saveMessageWithArray
- (void)saveMessageWithArray:(NSArray *)messageArray {
for (NSDictionary *myDic in messageArray) {
if (![[FMDBManager sharedInstance] didMessageExistWithMessageID:[myDic objectForKey:@"messageId"]]) {
[[FMDBManager sharedInstance] SaveMessage:myDic];
}
else {
NSString *mid=[NSString stringWithFormat:@"%@",myDic[@"messageId"]];
NSString *isRead = myDic[@"isReaed"];
if (isRead) {
[[FMDBManager sharedInstance] UpdateisReadWithMessageID:mid];
}
}
}
}
所以我想现在我的问题是如何在服务器同步之前用arrayToDelete更新messageAllArray？