display array in a label in swift

问题

I would like two display Object data gotten from Parse in swift. I have tried using label in this way but it only displays the last element in the object. Please how can I make it display all the element in the object in the label. Like one element to one label. Thanks

 let query = PFQuery(className: "Questionnaire")
 query.findObjectsInBackground { (objects, error) -> Void in
    if error == nil {

     // There were no errors in the fetch
        if let returnedObjects = objects {
     // var text = ""
     // Objects Array is not nil
     // loop through the array to get each object

             for object in returnedObjects {
                 print(object["question"] as! String)
                 // text.append(object["question"] as! String)
                self.Label.text = (object["question"] as! String)


             }


        }
    }
 }

回答1:

You can do in one line like that and join all question with , separator , you can change separator to any (empty, -,...etc)

if let returnedObjects = returnedObjects {
    self.Label.text = returnedObjects.map {($0["question"] as? String) ?? nil}.compactMap({$0}).joined(separator: ",")
}

回答2:

Use tableview for this.

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! YouTableViewCell 
        cell.textLabel.text = yourArray[indexpath.row] as? String ?? ""          
        return cell

}

回答3:

If it's important to use UILabel

var concatenatedString = ""

for object in returnedObjects {

    concatenatedString += object["question"] as! String
}

self.Label.text = concatenatedString

回答4:

You are looping through the array and setting each value to Label.text. However, setting Label.text will replace what was on the label before. That's why you only see the last item.

One solution is to display the string representation of the array:

self.Label.text = "\(object)"

Another solution is to display the items in a table view Suganya Marlin has suggested. You would need to conform to UITableViewDatasource and implement the various methods. Here is a guide.

来源：https://stackoverflow.com/questions/50286499/display-array-in-a-label-in-swift

标签

swift

object

parse-platform