Swift safely unwrapping optinal strings and ints

Question

When I am about to fire my segue for the 2nd view I also send some values like this:

if let aTime = ads[indexPath.row]["unix_t"].int {
    toView.time = aTime
}

if let aTitle = ads[indexPath.row]["title"].string {
    toView.title = aTitle
}

In the second VC I have declared the varibles like:

var time: Int?
var title: String?

and this is how I unwrap the values:

if time != nil {
   timeLabel.text = String(time!)
}

if title != nil {
   titleLabel.text = title!
}

This all works I never get any error caused by unwrapped varibles or nil values. But is there any easier way to do it?

Right now it feels like I am checking too much

Answer 1

I can think of three alternatives.

1. if/let. Very similar to your current option, but you don't have to implicitly unwrap.

   if let time = time {
       timeLabel.text = "\(time)"
   }
   
   if let title = title {
       titleLabel.text = title
   }
   

   You can even unwrap them on the same line. The downside to this is that if one of them is nil, then neither label will be set.

   if let time = time, let title = title {
       timeLabel.text = "\(time)"
       titleLabel.text = title
   }
   

2. guard/let. If these are in a function like setupViews(), then you can one-line your unwrapping like so:

   func setupViews() {
       guard let time = time, let title = title else { return }
       timeLabel.text = "\(time)"
       titleLabel.text = title
   }
   

3. You can use default values and the ?? operator to unwrap quickly.

   timeLabel.text = "\(time ?? 0)"
   titleLabel.text = title ?? ""