extension Date { has no effect-CodePudding

This is my original timestamp code How should I modify to cite him How should I modify the code to refer to the "extension Date {" code


 func getDatas(){ 
if let timestamp = document.get("timestamp") as? TimeInterval {
                                        let date = Date(timeIntervalSince1970: timestamp)
                                        let post = Post(email: email, caption: caption, imageUrl: imageURL, date: date)

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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! FeedCell
        let post = self.postArray[indexPath.row]
        let date = post.date
        
        let dateFormatter = DateFormatter()
        
        dateFormatter.dateFormat = "yyyy/MM/dd HH:mm"
        let dateString = dateFormatter.string(from: date)
        
        self.getUserInfo(userEmail: postArray[indexPath.row].email,cell: cell)
        cell.captionLabel.text =  postArray[indexPath.row].caption
        cell.postImage.sd_setImage(with: URL(string: postArray[indexPath.row].imageUrl))
        
        cell.timeLabel.text = dateString

I want to change to the following date display method, but the changes have no effect

extension Date {
   
    static func timeString(timeInterval: TimeInterval) -> String{
      
        let date = getNowDateFromatAnDate(Date(timeIntervalSince1970: timeInterval/1000))
        
        let formatter = DateFormatter()
        if date.isToday() {
            //是今天
            formatter.dateFormat = "今天HH:mm"
            return formatter.string(from: date)
            
        }else if date.isYesterday(){
            //是昨天
            formatter.dateFormat = "昨天HH:mm"
            return formatter.string(from: date)
        }else if date.isSameWeek(){
            //是同一周
            let week = date.weekdayStringFromDate()
            formatter.dateFormat = "\(week)HH:mm"
            return formatter.string(from: date)
        }else{
            formatter.dateFormat = "yyyy-MM-dd HH:mm"
            return formatter.string(from: date)
        }
    }
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How should I modify to cite him

CodePudding user response：

The static keyword allow us to attach the method to a class/struct rather than to instances of it. And since the static func timeString(timeInterval: TimeInterval) -> String in your Date extension returns a string you can replace your Post date: Date variable with timeString: String and then you can access it directly:

if let timestamp = document.get("timestamp") as? TimeInterval {
  let timeString = Date.timeString(timeInterval: timestamp)
  let post = Post(email: email, caption: caption, imageUrl: imageURL, timeString: timeString)
  // ...
}

cell.timeLabel.text = post.timeString