Variable used within its own initial value in Swift 5

Question

I try to write an animation with Swift 5, following are some codes

let animations:(() -> Void) = {
    self.keyboardOPT.transform = CGAffineTransform(translationX: 0,y: -deltaY)
    if duration > 0 {
        let options = UIView.AnimationOptions(rawValue: UInt((userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as! NSNumber).intValue << 16))
        UIView.animate(withDuration: duration, delay: 0, options: options, animations: animations, completion: nil)
    } else {
        animations()
    }
}

But in animations: animations and animations() it shows error:

Variable used within its own initial value

The name of your block constant is animations => let animations:.... Inside this block, in your else statement, you also call animations(). So your calling the block inside the block. You cannot do this. — nico
– nico, Commented Apr 16, 2019 at 5:37
Possible duplicate of Use block in swift giving error "Variable used within its own initial value" — Cœur
– Cœur, Commented Apr 16, 2019 at 9:02

Mushrankhan · Accepted Answer · 2019-04-16 05:39:42Z

1

You can not call itself when initializing. You can achieve it like this also.

var animations:(() -> Void)!

animations = {
    animations()
}

answered Apr 16, 2019 at 5:39

Mushrankhan

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