Interface Builder找不到在自定义视图中定义的internalContentSize

Question

Interface Builder cannot find intrinsicContentSize of a custom view. For this given view code,

import Foundation
import UIKit

@IBDesignable
final class CustomView1: UIView {
    override var intrinsicContentSize: CGSize {
        return CGSize(width: 100, height: 100)
    }
}

I put a UIView instance and set its class to CustomView1 . It works at first, but if I close and re-open the storyboard, IB sometimes (not always) shows an error.

IB cannot find width of the view.

And this error disappears if I force Update Frames .

It looks like a bug. Or am I missing something important? What's your opinion? Any workaround?

Answer 1

Xcode 11 has intrinsic size option in Size inspector . as below