How to assign a String variable to a Label or TextField in iOS

Question

When print(mess) is called from the viewDidLoad function, it prints what is expected in the console, but when it is assigned to a UITextField or UILabel, then the assigned value is not getting reflected in the UITextField or UILabel. why is this ?

Doing this:

var mess: String = ""
override func viewDidLoad()
{
    super.viewDidLoad()
    self.infoLabel.text = mess //label not getting updated

    print(mess) //printing the required output in console
}

But when I am doing this its working fine

override func viewDidLoad()
{
    super.viewDidLoad()
    let date = DATE()
    let calendar = Calendar.current
    let minutes = calendar.component(.minutes, from: date)
    temp.text = String(minutes)


}

Check if infoLabel has reference outlet in storyboard (connections inspector) — Rahul Kumar, Mar 08 '18 at 07:04
@RahulKumar no it has no reference outlet.. but when I am trying to assign current time(minutes) its working fine — san, Mar 08 '18 at 07:09
place "self.infoLabel.text = mess" in viewDidAppear() method — Rahul Kumar, Mar 08 '18 at 07:12
@RahulKumar tried this also before posting this question but not working and in console getting empty value — san, Mar 08 '18 at 07:19
@RahulKumar pls check this one https://stackoverflow.com/questions/49151736/getting-empty-value-in-viewwillappear-but-getting-valid-value-in-viewdidload — san, Mar 08 '18 at 07:54

Needhi Roy · Answer 1 · 2018-03-08T07:06:55.587

0

First assign value to mess variable then update UITextField value. At time of assign value to UITextField in viewDidLoad its have default value "".

var mess: String = ""
    override func viewDidLoad()
    {
        super.viewDidLoad()
        mess = "123"
        self.infoLabel.text = mess //label not getting updated

        print(mess) //printing the required output in console
    }

edited Mar 08 '18 at 07:06

answered Mar 08 '18 at 07:05

Needhi Roy

160
1
6

Try to add in viewWillAppear – Needhi Roy Mar 08 '18 at 07:08
@Needhi, value is getting printed in console. he has stated that already in question. – Rahul Kumar Mar 08 '18 at 07:08
@NeedhiRoy tried this also before posting this question but not working and in console getting empty value – san Mar 08 '18 at 07:21
Check out you `IBOutlet` connection to `InfoLabel`. Try to delete connection and add again. – Needhi Roy Mar 08 '18 at 07:32

iParesh · Answer 2 · 2018-03-08T09:06:23.697

0

Simple way you can reflate UILabel value using didSet

var mess:String = "" {
        didSet {
            setupLabel()
      }
 }

func setupLabel() {
     self.infoLabel.text = mass
}

Whenever mess value change it automatically infoLabel value change

edited Mar 08 '18 at 09:06

answered Mar 08 '18 at 07:58

iParesh

2,338
1
18
30

done this too but getting Fatal error: Unexpectedly found nil while unwrapping an Optional value – san Mar 08 '18 at 08:36

How to assign a String variable to a Label or TextField in iOS

2 Answers2