UIView.animate - Swift 3 - 完成

Question

How do I do a simple completion block in Swift 3?

I want to set self.isOpen = true in the completion of the animation:

            UIView.animate(withDuration: 0.25, delay: 0.0, options: [], animations: {
                self.isOpen = true
                self.drawerView?.frame = CGRect(x: 0, y: 0, width: (self.drawerView?.frame.size.width)!, height: (self.drawerView?.frame.size.height)!)
                self.contentView?.frame = CGRect(x: 200, y: 0, width: (self.contentView?.frame.size.width)!, height: (self.contentView?.frame.size.height)!)
            }, completion: nil)

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In passing:

It's pretty impossible to learn Swift 3 atm due to NOTHING on the internet working :(

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I've also searched this entire document for even a mention of the word "animate" and could not find anything:

https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/index.html#//apple_ref/doc/uid/TP40014097-CH3-ID0

Answer 1

You add it like this:

UIView.animate(withDuration: 0.25, delay: 0.0, options: [], animations: {
    self.drawerView?.frame = CGRect(x: 0, y: 0, width: (self.drawerView?.frame.size.width)!, height: (self.drawerView?.frame.size.height)!)
    self.contentView?.frame = CGRect(x: 200, y: 0, width: (self.contentView?.frame.size.width)!, height: (self.contentView?.frame.size.height)!)
}, completion: { (finished: Bool) in
    self.isOpen = true
})