Use strongly-typed KeyPath in CALayer#animate()

[sindresorhus]

In this extension:

CircularProgress/Sources/CircularProgress/CustomButton.swift

Lines 74 to 99 in b921e83

	extension CALayer {
	// TODO: Find a way to use a strongly-typed KeyPath here.
	// TODO: Accept NSColor instead of CGColor.
	func animate(color: CGColor, keyPath: String, duration: Double) {
	guard (value(forKey: keyPath) as! CGColor?) != color else {
	return
	}
	let animation = CABasicAnimation(keyPath: keyPath)
	animation.fromValue = value(forKey: keyPath)
	animation.toValue = color
	animation.duration = duration
	animation.fillMode = .forwards
	animation.isRemovedOnCompletion = false
	add(animation, forKey: keyPath) { [weak self] _ in
	self?.setValue(color, forKey: keyPath)
	}
	}
	func add(_ animation: CAAnimation, forKey key: String?, completion: @escaping ((Bool) -> Void)) {
	let animationDelegate = AnimationDelegate()
	animationDelegate.didStopHandler = completion
	animation.delegate = animationDelegate
	add(animation, forKey: key)
	}
	}

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Submitted pull Requests

• #28 Migration to swift keypaths

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