Need help with Swift 4.2

Question

Created Jun ’20

Replies 3

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Participants 3

Hi, I have started learning Swift recently and due to system specifications, I am learning how to build apps for iOS 12.
I have written a code to update UI based on user's click.
Note : This function is called in the IBAction Function

Code Block func updateUI() {    //Here i is a global variable
    scoreLabel.text = "Score : \(score)"
     
    progressLabel.text = "Question: \(questionNumber+1) / 13"
     
    progressBar.frame.size.width = (CGFloat(view.frame.size.width) / 13) * CGFloat(i)
    print("i: \(i)")
    i = i + 1
      //CGFloat(allQuestion.list.count) * CGFloat(questionNumber + 1)
    print(progressBar.frame.size.width)
 }

But the progress bar frame is not getting updated. I checked and the value is getting updated but when I check on simulator, the progress bar is not updating, rest all are fine.

Kindly help me out to solve this issue

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Answer 1

Claude31 OP

Jun ’20

Please show the complete code of your function.
What is progressBar ? Is it a UIView ?

Try adding this at line 7:

Code Block progressBar.setNeedsDisplay()

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Answer 2

DikkeBana OP

Apr ’21

I know exactly what course you're following ;) I'm here on this specific thread, having the exact same issue. The answer provided by Claude31 does not work.

Tagging along for the right answer.

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Answer 3

Claude31 OP

Apr ’21

@DikkeBana

Without more code and details on what you get and what you expect, it is pretty hard to tell where the error is.
So I need to guess:

the update occurs in a loop
the frame is updated only at the end of loop

Is it exact ?

If so, you need to:

execute in another thread
and return to main thread for updating the frame.

See my answer for a similar issue in this other thread:
https://developer.apple.com/forums/thread/678507

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