cwalo’s gists

cwalo / LinkModifier.swift

Created March 20, 2025 00:27

A way to chain OpenURLAction handlers

	import Foundation
	import PlaygroundSupport
	import SwiftUI
	import UIKit

	protocol Scheme {
	var url: URL { get }
	}

	enum ActionScheme: Scheme {

cwalo / PositionTrackingScrollView.swift

Created October 8, 2024 23:59

A SwiftUI ScrollView wrapper allowing tracking and setting the scroll position (< iOS 17)

	import Foundation
	import SwiftUI

	struct ScrollViewTracking: Equatable {
	/// A stable identifier to name the view's coordinate space
	let namespace: AnyHashable = UUID()
	/// The current position of the scroll view
	var position: CGPoint = .zero
	/// The scroll view's content size
	var contentSize: CGSize = .zero

cwalo / IndentScrollView

Last active July 9, 2024 21:36

IndentScrollView - A paging ScrollView that tracks the target content view

	import SwiftUI

	struct IndentScrollView: View {
	let min = 0.5
	let max = 3.5
	let increment = 0.1

	@State
	var multiplier = 0.5

cwalo / BottomSheet.swift

Last active December 22, 2022 18:55

	//
	// BottomSheetView.swift
	// field
	//
	// Created by Corey Walo on 12/21/22.
	//

	import SwiftUI

	fileprivate enum Constants {

cwalo / deps.swift

Created March 18, 2020 17:57

	protocol FooProtocol {}
	protocol BarProtocol {}
	protocol DootProtocol {}

	typealias CompProtocol = FooProtocol & BarProtocol & DootProtocol

	struct Dependencies: CompProtocol {}

	struct SomeType {

cwalo / HeightOfStringFittingWidth.swift

Created June 7, 2019 03:31

How to calculate the height of a string fitting a given width

	func heightOfString(_ string: String, attributes: [NSAttributedString.Key: Any], fitting width: CGFloat) -> CGFloat {

	let constraintRect = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)
	let boundingRect = string.boundingRect(with: constraintRect,
	options: [.usesLineFragmentOrigin, .usesFontLeading],
	attributes: attributes,
	context: nil)

	return boundingRect.size.height
	}

cwalo / things_you_should_know.md

Last active June 29, 2020 14:59

Things you should know, but might forget...

This is a curated list of reference material that anyone who develops in the Apple domain will hopefully find helpful. Most items are things I have used and can vouch for.

--

Swift

--

The Swift Programming Language

Swift Forums

cwalo / AddShadowAndRoundedCorners.swift

Created January 10, 2018 19:44

Override layoutSubviews to add a new layer using a path with a roundedRect and cornerRadius

	private var shadowLayer: CAShapeLayer!
	private var cornerRadius: CGFloat = 25.0
	private var fillColor: UIColor = .blue // the color applied to the shadowLayer, rather than the view's backgroundColor

	override func layoutSubviews() {
	super.layoutSubviews()

	if shadowLayer == nil {
	shadowLayer = CAShapeLayer()

cwalo / RoundShadowView.swift

Created December 29, 2017 00:10

UIView with cornerRadius and Shadow

	/*
	Example of how to create a view that has rounded corners and a shadow.
	These cannot be on the same layer because setting the corner radius requires masksToBounds = true.
	When it's true, the shadow is clipped.
	It's possible to add sublayers and set their path with a UIBezierPath(roundedRect...), but this becomes difficult when using AutoLayout.
	Instead, we a containerView for the cornerRadius and the current view for the shadow.
	All subviews should just be added and constrained to the containerView
	*/

	import UIKit

cwalo / String+Emoji.swift

Created October 4, 2017 00:49

String+Emoji

	import Foundation

	extension String {
	var containsEmoji: Bool {
	for scalar in unicodeScalars {
	switch scalar.value {
	case 0x1F600...0x1F64F, // Emoticons
	0x1F300...0x1F5FF, // Misc Symbols and Pictographs
	0x1F680...0x1F6FF, // Transport and Map
	0x1F900...0x1F9FF, //idk but here lies clown and others

Corey Walo cwalo

Things you should know, but might forget...

Swift