UIScreen.main.bounds.width returning nil in Swift 3

Question

In my project, I got messed up with two versions of app. I propably copied the project file and it created a problem. This line

myLogo.frame.size.width = UIScreen.main.bounds.width

shows, that UIScreen.main.bounds.width returns nil. How is that even possible?

fatal error: unexpectedly found nil while unwrapping an Optional value

What could be the reason and how can I repair it?

I'm working on the latest Xcode and writing in Swift 3.

Answer 1

Be sure myLogo is connected to your storyboard (the little dot to the left of myLogo's declaration should be dark). Then set it's frame's width property like this:

    let width = UIScreen.main.bounds.width
    let r = myLogo.frame
    myLogo.frame = CGRect(x: r.origin.x, y: r.origin.y, width: width, height: r.height)

This would probably be better to do in Interface Builder with auto-layout so myLogo's width is constrained to the device's width.

Here's a useful extension that lets you adjust individual properties of a UIView's frame e.g.

myLogo.width = UIScreen.main.bounds.width