Stefan Herold Blackjacx

Which SwiftUI property wrapper to choose in any situation?

Thanks to Paul Hudson this question is also answered visually now:

I am the maintainer of the following open source software:

	import UIKit


	class NibLoadableView: UIView {

	@IBOutlet var view: UIView!

	override init(frame: CGRect) {
	super.init(frame: frame)
	}

	#!/bin/bash

	#
	# Bash script for downloading WWDC video and pdf ressources
	# You can choose the year you're interested in by altering the variable YEAR (works only for 2014 until today).
	#
	# IMPORTANT
	# Please install wget prior running this script since this tool is used to download the pdf's and videos. I use it
	# since it is able to prevent re-downloading already existing content. So you can just run this script again and
	# again and it will just download new content. This is really useful in the week of the WWDC since videos are

	static func deviceAndVersionSpecificInformationAsString(userID: String?) -> String {
	let processInfo = NSProcessInfo()
	let byteCountFormatter = NSByteCountFormatter()
	var data = Array<String>()
	var systemComponents = Array<String>()

	byteCountFormatter.countStyle = .Memory
	byteCountFormatter.allowsNonnumericFormatting = false

	data.append(UIDevice.versionString())

	func addSubviewMaximized(subview: UIView, insets: UIEdgeInsets? = nil) {
	let insets = insets ?? UIEdgeInsetsZero
	let constraints: [NSLayoutConstraint] = [
	subview.leftAnchor.constraintEqualToAnchor(leftAnchor, constant: insets.left),
	subview.leftAnchor.constraintEqualToAnchor(leftAnchor, constant: -insets.right),
	subview.topAnchor.constraintEqualToAnchor(topAnchor, constant: insets.top),
	subview.bottomAnchor.constraintEqualToAnchor(bottomAnchor, constant: -insets.bottom),
	]

	subview.translatesAutoresizingMaskIntoConstraints = false

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
     let strippedString = <change replacements string so it fits your requirement - strip, trim, etc>
     // replace current content with stripped content
     if let replaceStart = textField.position(from: textField.beginningOfDocument, offset: range.location),
         let replaceEnd = textField.position(from: replaceStart, offset: range.length),
         let textRange = textField.textRange(from: replaceStart, to: replaceEnd) {
         textField.replace(textRange, withText: strippedString)

	#/bin/bash
	EXT="tif"
	# use xargs to trim whitespaces
	COUNT=`ls -1 *.$EXT 2>/dev/null \| wc -l \| xargs`
	THRESHOLD="50%"

	# check if there are files of the specified extension
	if [ $COUNT != 0 ]
	then
	echo "Converting $COUNT $EXT's to black and white and merge them to one PDF..."

	extension XCUIElement {
	/**
	Removes any current text in the field before typing in the new value
	- Parameter text: the text to enter into the field
	*/
	func clearAndEnterText(text: String) {
	defer {
	self.typeText(text)
	}

	extension UIView {
	func applyParallax() {

	let amount = 10

	let horizontal = UIInterpolatingMotionEffect(keyPath: "center.x", type: .tiltAlongHorizontalAxis)
	horizontal.minimumRelativeValue = -amount
	horizontal.maximumRelativeValue = amount

	let vertical = UIInterpolatingMotionEffect(keyPath: "center.y", type: .tiltAlongVerticalAxis)