Question

我有一个带PHP和MySQL后端的iPhone应用程序。我在底部有一个标签栏，想要显示一个徽章，其中显示了存储在数据库中的用户消息数。

我已经测试了PHP文件和MySQL查询，它们都可以工作。我还对徽章编号进行了硬编码，以查看Swift代码是否也可以正常工作。卡住的地方是当我将这三个全部放在一起时，值仍然不会显示在标签栏上。我打印了该值，并且确实不在选项卡上。

代码如下：

// func of loading posts from server
func loadPosts()->[String] {

     // append all posts var's inf to tweets
     self.hhmessages = messages as! [AnyObject]
     //print(self.hhmessages)

      self.incoming = []

      // getting images from url paths
      for i in 0 ..< self.hhmessages.count {

       // path we are getting from $returnArray that assigned to parseJSON > to posts > tweets
          let incoming = self.hhmessages[i]["badgecount"]!
          print(incoming! as Any)

          // Access the elements (NSArray of UITabBarItem) (tabs) of the tab Bar
          let tabItems = self.tabBar.items as NSArray?

          // In this case we want to modify the badge number of the third tab:
          let tabItem = tabItems![3] as! UITabBarItem
          let messagevalue = incoming!

          print(messagevalue as Any)

          // Now set the badge of the third tab
          tabItem.badgeValue = messagevalue as? String
      }
      // reload tableView to show back information          
   }

Answer 1

好的，请尝试使用以下结构。

func loadPosts() {

    //1. instead of -> self.hhmessages = messages as! [AnyObject]
    self.hhmessages = messages as! [[String: Any]]  //the hhmessages shoud be of type [[String: Any]] better readabilty

    //2. self.incomin = []  -> What is this used for?

    //3. we will create new variable to store all the badge counts for future refrence
    var badgeCount = 0

    //4. loop through the messages and get the badge count (Not sure if badgeCount is the key or unread)
    //but I'll go as you have done
    for message in hhmessages {
        if let count = message["badgecount"] as? Int {
            badgeCount += count
        }
    }

    //5. we have the badge count so we will access the tabbar to which we will display the badge icon
    if let tabItems = self.tabBar.items {
        let thirdTab = tabItems[2] //get the third tab item

        //6. set the value of badge
        thirdTab.badgeValue = "\(badgeCount)"

    }
}

MySQL的UITabbar徽章值

1 个答案: