nicklockwood

// Swift's untyped errors are a goddam PiTA. Here's the pattern I use to try to work around this.
// The goal is basically to try to guarantee that every throwing function in the app throws an
// ApplicationError instead of some unknown error type. We can't actually enforce this statically
// But by following this convention we can simplify error handling

enum ApplicationError: Error, CustomStringConvertible {
    
  // These are application-specific errors that may need special treatment
  case specificError1
  case specificError2(SomeType)

myell0w

import Foundation
import UIKit


/// Used to create a layout guide that pins to the top of the keyboard
final class KeyboardLayoutGuide {

    private let notificationCenter: NotificationCenter
    private let bottomConstraint: NSLayoutConstraint

smileyborg

// For the best results, your tableHeaderView/tableFooterView should be a UITableViewHeaderFooterView with your content inside the contentView.
let tableHeaderView = UITableViewHeaderFooterView()
    
let fittingSize = CGSize(width: tableView.bounds.width - (tableView.safeAreaInsets.left + tableView.safeAreaInsets.right), height: 0)
let size = tableHeaderView.systemLayoutSizeFitting(fittingSize, withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel)
tableHeaderView.frame = CGRect(origin: .zero, size: size)
tableView.tableHeaderView = tableHeaderView

// When you set this view to the tableHeaderView/tableFooterView on the table view, the table view will preserve the existing size of its frame.
// If you need to change the size, remove the tableHeaderView/tableFooterView, set a new frame on it, then re-set it on the table view again.

ddunbar

New Build System Tricks

Command Line

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild
# THIS DOESNT WORK YET: xcbuild openIDEConsole  # … then switch to Xcode ➡️
xcbuild showSpecs
xcbuild build <foo.pif> [—target <target>]

inamiy

React & Elm inspired frameworks in Swift

This is a curated list of iOS (Swift & ObjC) frameworks which are inspired by React and Elm.

Swift frameworks

React-inspired

• ReactSwift by @ColinEberhardt
• https://github.com/ColinEberhardt/ReactSwift

ilyapuchka

!/bin/sh
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
FILES=($(git ls-files -m | grep ".*\.swift$" | grep -v ".*R.generated.swift$"))

if [[ ${FILES[@]} ]]; then
export "SCRIPT_INPUT_FILE_COUNT"="${#FILES[@]}"
for i in "${!FILES[@]}"; do
  export "SCRIPT_INPUT_FILE_$i"="${FILES[$i]}"  
done

ilyapuchka

// The issue with sectionHeadersPinToVisibleBounds and sectionFootersPinToVisibleBounds is that they do not pin 
// first header and last footer when bouncing. This layout subclass fixes that.

class StickyLayout: UICollectionViewFlowLayout {
    
    override init() {
        super.init()
        self.sectionFootersPinToVisibleBounds = true
        self.sectionHeadersPinToVisibleBounds = true
    }

JohnSundell

import UIKit

class OnboardingManager {
    private let userDefaults: UserDefaults

    init(userDefaults: UserDefaults = .standard) {
        self.userDefaults = userDefaults
    }

    func presentOnboardingControllerIfNeeded(in viewController: UIViewController) {

chriseidhof

let string = "Hello, Playgrounds"

extension String {
    func appending(_ other: String) -> String {
        return self + other
    }
}
let otherString = string.appending("!")
string
  

steipete

#define PSPDF_KEYPATH(object, property) (^{ \
    _Pragma("clang diagnostic push") \
    _Pragma("clang diagnostic ignored \"-Wunreachable-code\"") \
    _Pragma("clang diagnostic ignored \"-Wimplicit-retain-self\"") \
    return ((void)(NO && ((void)object.property, NO)), @#property); \
    _Pragma("clang diagnostic pop") \
}())