Whats the Swift animate WithDuration syntax?

问题

I'm porting an older app over to Xcode 7 beta and I'm getting an error on my animations:

Cannot invoke 'animateWithDuration' with an argument list of type '(Double, delay: Double, options: nil, animations: () -> _, completion: nil)'

Here's the code:

 UIView.animateWithDuration(0.5, delay: 0.3, options: nil, animations: {
      self.username.center.x += self.view.bounds.width
    }, completion: nil)

This works in Xcode 6 so I'm assuming this is an update in Swift. So my question is:

What's the Swift 3 syntax for animateWithDuration?

回答1:

Swift 3/4 Syntax

Here's an update with the Swift 3 Syntax:

UIView.animate(withDuration: 0.5, delay: 0.3, options: [.repeat, .curveEaseOut, .autoreverse], animations: {
    self.username.center.x += self.view.bounds.width
}, completion: nil)

If you need to add a completion handler just add a closure like so:

UIView.animate(withDuration: 0.5, delay: 0.3, options: [.repeat, .curveEaseOut, .autoreverse], animations: {
    // animation stuff      
}, completion: { _ in
    // do stuff once animation is complete
})

Old Answer:

It turns out it's a very simple fix, just change options: nil to options: [].

Swift 2.2 Syntax:

UIView.animateWithDuration(0.5, delay: 0.3, options: [], animations: {
      self.username.center.x += self.view.bounds.width
    }, completion: nil)

What changed?

Swift 2 got rid of the C-Style comma-delimited list of options in favor of option sets (see: OptionSetType). In my original question, I passed in nil for my options, which was valid prior to Swift 2. With the updated syntax, we now see an empty option list as an empty set: [].

An example of animateWithDuration with some options would be this:

 UIView.animateWithDuration(0.5, delay: 0.3, options: [.Repeat, .CurveEaseOut, .Autoreverse], animations: {
      self.username.center.x += self.view.bounds.width
    }, completion: nil)

回答2:

Swift 3, 4, 5

UIView.animate(withDuration: 1.5, delay: 0.05 * Double(index), usingSpringWithDamping: 0.8, initialSpringVelocity: 0, options: [], animations: {
    cell.transform = CGAffineTransform(translationX: 0, y: 0)
}, completion: nil)

回答3:

Swift 3 Syntax with completion block

UIView.animate(withDuration: 3.0 , delay: 0.25, options: .curveEaseOut, animations: {

        // animation
    }, completion: { _ in

        // completion
    })

回答4:

Swift 2

UIView.animateWithDuration(1.0, delay: 0.1, options: [.Repeat, .CurveEaseOut, .Autoreverse], animations: {
    // animation
}, completion: { finished in
    // completion
})

Swift 3, 4, 5

UIView.animate(withDuration: 1.0, delay: 0.1, options: [.repeat, .curveEaseOut, .autoreverse], animations: {
    // animation
}, completion: { finished in
    // completion
})

来源：https://stackoverflow.com/questions/30991822/whats-the-swift-animate-withduration-syntax

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