CFRunLoopSource
is cool. It lets you build behavior similar to the mechanisms that drive setNeedsLayout
and setNeedsDisplay
in UIKit.
I found myself in need of something like this a couple of times. It's great to know that no matter how many times I say I need to update something, I will get a single callback at the end of the run loop that gives me a chance to perform my work.
Here is a little Swift wrapper that makes the API easier to deal with.
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extension Array { | |
func first() -> Element? { | |
if isEmpty { | |
return nil | |
} | |
return self[0] | |
} | |
func last() -> Element? { |
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// Created by Caleb Davenport on 7/14/17. | |
import UIKit | |
final class ActionSheetPresentationController: UIPresentationController { | |
// MARK: - Properties | |
private var dimmingView: UIView! |
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import Foundation | |
/// An abstract class that makes building simple asynchronous operations easy. | |
/// Subclasses must implement `execute()` to perform any work and call | |
/// `finish()` when they are done. All `NSOperation` work will be handled | |
/// automatically. | |
open class AsynchronousOperation: Operation { | |
// MARK: - Properties |
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