@IBDesignable error: IB Designables: Failed to update auto layout status: Interface Builder Cocoa Touch Tool crashed

Question

I have a very simple subclass of UITextView that adds the "Placeholder" functionality that you can find native to the Text Field object. Here is my code for the su

Answer 1

Make sure that you are not directly initialising UIImage or UIFont using assets or fonts added in your project.

I always create a private func setUp() in my @IBDesignable custom UI classes. which is called from init(frame: CGRect), init?(coder aDecoder: NSCoder). So I finally updated the setup() as the following.

private func setUp() {

     //... Doing initial configurations

     // iconImageView.image = UIImage(named: "IconImageName")! // Causing the Crash, use if let OR guard let instead
     if let icon = UIImage(named: "IconImageName") {
          iconImageView.image = icon
          iconImageView.frame.size = icon.size
     }

     // nameLabel.font =  UIFont(name: "Calibri-Light", size: 15.0) // Causing the Crash, use if let OR guard let instead
     if let font = UIFont(name: "Calibri-Light", size: size) {
          nameLabel.font =  font
     } else {
          nameLabel.font = UIFont.systemFont(ofSize: size) 
     }

     // Doing other stuffs
}