leviathan

Combine syntactic sugar

Defining a Publisher pipeline, that Never fails:

Before

let diamonds: AnyPublisher<Diamond, Never>

leviathan

youtube-dl command line

Use master version directly via:

python3 -m pip install --force-reinstall https://github.com/yt-dlp/yt-dlp/archive/master.tar.gz

yt-dlp xx

leviathan

# install ffmpeg
brew install ffmpeg

# convert .mov file to .mp4
ffmpeg -i demo.mov -vcodec h264 demo.mp4

leviathan

import Combine
import UIKit

/// View controller, that publishes events for it's `view`'s lifecycle,
/// and allows type safe access to it's main `UIView`.
class ObservableViewController<V: UIView>: UIViewController {

    typealias LifecycleEvent = (view: V, animated: Bool)

    /// Broadcasts event after the controller's view is loaded, e.g. `viewDidLoad()`.

leviathan

import Foundation
import UIKit
import Combine
import PlaygroundSupport

/// The `ScopedReceivePublisher` modifies any returned `Publisher` property  of `V` to receive
/// published elements on the specified `Scheduler`.
///
/// Usage:
/// ```

leviathan

Swift code snippets

Make every view scollable

You can constrain the content, the UIStackView, to the contentLayoutGuide top, bottom, leading, and trailing to define the scrollable area. You can then constrain the UIStackView’s width to the frameLayoutGuide so that it only scrolls vertically. That’s it—your content can now scroll as it shrinks or grows!

UIView update constraints

final class SomeView: UIView {

leviathan

Table

Before	After

raw

| Before | After |

leviathan

Show Terminal config variables

$ env
TERM_PROGRAM=Apple_Terminal
SHELL=/usr/local/bin/zsh
TERM=xterm-256color
TMPDIR=/var/folders/l4/kb9wf5dn5g31y8ctr6fj_f9c0000gn/T/
...

leviathan

/// Quickly dump a UIImage from memory into a tmp file.

var image: UIImage?
// ...

let imageFilePath = NSTemporaryDirectory() + "\(Date().timeIntervalSince1970).png"
try? image.pngData()!.write(to: URL(fileURLWithPath: imageFilePath))
print("Saved turn-by-turn advice image to: \(imageFilePath)")

leviathan

Environment Info

xcode-select --print-path
xcodebuild -version
swift --version
swift build --version
pkgutil --pkg-info=com.apple.pkg.CLTools_Executables | grep version   // Check Xcode Command-Line-Tools Version