Is it possible to make @IBDesignable override Interface Builder values?

Question

For example, I want to subclass UIButton and set it's font to 20.0f by default. I can write something like this:

@IBDesignable

class HCButton: UIButton {
  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    self.customInit()
  }

  func customInit () {
    titleLabel?.font = UIFont.systemFontOfSize(20)
  }
}

But this does not affect preview in Interface Builder, all custom buttons appear with 15.0f font size by default. Any thoughts?

Ashish Kakkad · Accepted Answer · 2015-08-13T17:52:45.183

4

I have created new IBInspectable as testFonts :

import UIKit

@IBDesignable

class CustomButton: UIButton {
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.customInit()
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.customInit()
    }

    func customInit () {
        titleLabel?.font = UIFont.systemFontOfSize(20)
    }

    convenience init() {
        self.init(frame:CGRectZero)
        self.customInit()
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        self.customInit()
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        self.customInit()
    }
}

Hope it helps you :)

This is working for me.

edited Aug 13 '15 at 17:52

answered Aug 13 '15 at 13:34

Ashish Kakkad

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Will `@IBInspectable var testFonts: UIFont` appear in Interface Builder? – orkenstein Aug 13 '15 at 17:42
@orkenstein No :( It's not displayed. but the font size is changed. – Ashish Kakkad Aug 13 '15 at 17:43
Remove it from listing and paste `titleLabel?.font = UIFont.systemFontOfSize(20)` from original question. It might confuse some wanderer. And thanks for the clue! – orkenstein Aug 13 '15 at 17:45
1

Yes it's ok, The only thing i can dream about now - make this default value replace **Font** value in interface builder. – orkenstein Aug 13 '15 at 18:02
Hey, @AshishKakkad, great post! But I notice that `awakeFromNib` function is not needed in my testing to make the `customInit ` setting visible in the interface builder. Is there a reason why you are adding that? Also, I believe `convenience init()` is not needed either. – Yuchen Apr 24 '17 at 14:26

score 0 · Answer 2 · answered Aug 13 '15 at 13:17

0

I think you must override the init with frame initializer as well to affect that

override init(frame: CGRect) {

    super.init(frame: frame)
    self.customInit()
}

answered Aug 13 '15 at 13:17

Zell B.

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3
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score 0 · Answer 3 · answered Feb 06 '19 at 12:03

EASIER: The following solution usually works or me

import UIKit

@IBDesignable
class CustomButton: UIButton {
    open override func layoutSubviews() {
        super.layoutSubviews()
        customInit()
    }

    func customInit () {
        titleLabel?.font = UIFont.systemFontOfSize(20)
    }
}

I hope that's what you're looking for.

Is it possible to make @IBDesignable override Interface Builder values?

3 Answers3