顯示iOS徽章號碼/處理未讀郵件（xCode - OBJECTIVE-C）

Question

我想更新收件箱徽章以顯示未讀郵件的數量（我的郵件不會自毀，應用類似於iOS郵件）。

當用戶點擊郵件並返回到收件箱標籤時，徽章應該被更新。此外，我想標記未讀單元格的背景顏色與讀取單元格的方式不同......用戶知道已讀和未讀的內容。

我有一些工作的代碼，但現在我得到：

「警告：正在主線程上執行的長期運行的操作上warnBlockingOperationOnMainThread（）調試 休息。」

這是我的代碼有更新未讀郵件：

PFQuery *query = [PFQuery queryWithClassName:@"Messages"]; 
    [query whereKey:@"recipientIds" equalTo:[[PFUser currentUser] objectId]]; 
    [query orderByDescending:@"createdAt"]; 
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) { 
     if (error) { 
      NSLog(@"Error: %@ %@", error, [error userInfo]); 
     } else { 
      // messages were found! 
      self.messages = objects; 

      //find unread messages 
      [query whereKey:@"readBy" notEqualTo:[[PFUser currentUser] objectId]]; 
      self.unreadMessages = [query findObjects]; 

      // set badge # to number of msgs 
      if (self.unreadMessages.count > 0) { 

       [[self navigationController] tabBarItem].badgeValue = [NSString stringWithFormat:@"%lu", (unsigned long)self.unreadMessages.count]; 
      } 

      [self.tableView reloadData]; 

代碼更新小區：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath]; 

PFObject *message = [self.messages objectAtIndex:indexPath.row]; 
cell.textLabel.text = [message objectForKey:@"senderEmail"]; 

if ([self.unreadMessages containsObject:message]) { 
    // color background gray, bold the font 
}else{ 
    // leave cell alone 
} 

Answer 1

[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) 
{ 
    if (!error) 
    { 
     self.unreadMessages = [NSMutableArray arrayWithArray:objects]; 
     // set badge # to number of msgs 
     if (self.unreadMessages.count > 0) 
     { 
      [[self navigationController] tabBarItem].badgeValue = [NSString stringWithFormat:@"%lu", (unsigned long)self.unreadMessages.count]; 
     } 
     [self.tableView reloadData]; 
    } 
}