Can't set the slider to 0

Question

Created Nov ’20

Replies 10

Boosts 0

Views 1.3k

Participants 2

I'm trying to make my sliders at 0 make no shape but the issue is when any slider hits 0 it makes the shape go to its maximum size. What should I do?

Code Block func goToZero() {
    if otSlider.value == 0 {
      otWidth.constant = 0
      print(otWidth.constant)
    } else if efSlider.value == 0 {
      efWidth.constant = 0
    } else if ifSlider.value == 0 {
      ifWidth.constant = 0
    }
  }

Answered by ZoneX in 651018022

Alright I made a func that fixes the issue using the alpha.

Code Block func goToZero() {
    if otSlider.value == 0 {
      otShape.alpha = 0
    } else if efSlider.value == 0 {
      efShape.alpha = 0
    } else if ifSlider.value == 0 {
      ifShape.alpha = 0
    } else {
      otShape.alpha = 1
      efShape.alpha = 1
      ifShape.alpha = 1
    }
  }

Boost

Answer 1

Claude31 OP

Nov ’20

Which slider do you want to set to zero ?

What is otWidth.constant ? Is it a constraint ?
What do you want to set to zero ? The width of the slider ?

To set the value of a slider, use setValue:

Code Block func setValue(Float, animated: Bool)

In addition,

Code Block if otSlider.value == 0

the value is already zero, what do you want to change ?

So please clarify.

0

Answer 2

ZoneX OP

Nov ’20

OtWidth.constant is the width of the shape it's not constant which is ironic. I want when each of the sliders becomes 0 to not show anything.

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Answer 3

Claude31 OP

Nov ’20

You should call setNeedsLayout()

Code Block func goToZero() {
    if otSlider.value == 0 {
      otWidth.constant = 0
	  otSlider.setNeedsLayout()
      print(otWidth.constant)
    } else if efSlider.value == 0 {
      efWidth.constant = 0
	  efSlider.setNeedsLayout()
    } else if ifSlider.value == 0 {
      ifWidth.constant = 0
	  ifSlider.setNeedsLayout()
    }
  }

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Answer 4

ZoneX OP

Nov ’20

It still does not seem to work.

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Answer 5

Claude31 OP

Nov ’20

Does not seem to work

That's a bit vague.

What do you get ?
Please show more code, where you define and set otwidth. Show the full code of the class, including var and IBOutlets declarations.

They should not only be var, but IBOutlets connected to the constraint.

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Answer 6

ZoneX OP

Nov ’20

I will give you what I do for one of them since the rest are the same, for ot I have one variable and four outlets, in a class called PoVC

Code Block var otPerNum: Int = 0     //number I use in the textField
@IBOutlet weak var otStack: UIStackView!   //I use this to get the maximum value and set the value for the slider in the beginning.
otSlider.maximumValue = Float(otStack.frame.width)
otSlider.value = Float(otStack.frame.width) * 0.9
   
  
@IBOutlet weak var otWidth: NSLayoutConstraint!      //Use this to set what the measurement for how wide the shape is and control it using otWidth.constant.
   
   
@IBOutlet weak var otPer: UITextField!     //textField I use
   
   
@IBOutlet weak var otSlider: UISlider!      //This is the slider that controls the otWidth.constant and sends the number to the otPer.

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Answer 7

Claude31 OP

Nov ’20

Are the sliders in a stackView ? You should have told.

Because there is automatic sizing occurring in stackViews, you may have problem to set one object width to zero.

Maybe you should consider getting the sliders out of the stackView, I don't think you will loose much…

Anyway, IMHO, making the slider disappear (zero-width) when set to zero is not a very good design for user experience.

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Answer 8

ZoneX OP

Nov ’20

I don't mean making the slider disappear, I mean making the shape it controls disappear because 0 is nothing, I will try your solution.

0

Answer 9

Claude31 OP

Nov ’20

You should show some relevant code. and not only small pieces from which it is impossible to understand what's going on.

Have you connected the sliders to an IBAction ?
You should have somewhere in code:

Code Block @IBAction func testSlider(_ sender: UISlider) {
		goToZero()		// That's probably where you call it
     }

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Answer 10

ZoneX OP

Dec ’20

Accepted Answer

Alright I made a func that fixes the issue using the alpha.

Code Block func goToZero() {
    if otSlider.value == 0 {
      otShape.alpha = 0
    } else if efSlider.value == 0 {
      efShape.alpha = 0
    } else if ifSlider.value == 0 {
      ifShape.alpha = 0
    } else {
      otShape.alpha = 1
      efShape.alpha = 1
      ifShape.alpha = 1
    }
  }

0