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robertmryan / String+IntegerIndex.swift
Created Dec 11, 2019
Extension to `String` to allow numeric indexes for ranges
View String+IntegerIndex.swift
extension String {
public subscript(range: Range<String.IndexDistance>) -> Substring {
let lowerBound = index(startIndex, offsetBy: range.lowerBound)
let upperBound = index(startIndex, offsetBy: range.upperBound)
return self[lowerBound..<upperBound]
public subscript(range: ClosedRange<String.IndexDistance>) -> Substring {
let lowerBound = index(startIndex, offsetBy: range.lowerBound)
let upperBound = index(startIndex, offsetBy: range.upperBound)
View CancelDispatchWorkItemViewController.swift
class ViewController: UIViewController {
@IBOutlet weak var label: UILabel!
@IBOutlet weak var button: UIButton!
var isStart = false
var work: DispatchWorkItem?
private func getCurrentTime() -> DispatchWorkItem {
return DispatchWorkItem { [weak self] in
while self?.work?.isCancelled == false {
View Example.swift
let group = DispatchGroup()
for album in albums {
let formattedAlbum = AlbumFormatted(context: self.persistenceManager.context)
formattedAlbum.albumName =
self.getTracklist(album:!) { data in
// do whatever you need to add this `data` to your temporary result set
View Example.swift
struct Cost: Codable {
let id: String
let label: String
let value: String
let cost = Cost(id: "something", label: "something", value: "something")
let jsonData = try! JSONEncoder().encode(cost) // this works fine
let object = try! JSONSerialization.jsonObject(with: jsonData) // this works fine
View Synchron.m
@interface Synchron: NSObject
@property (copy, nonatomic) NSString *name;
@property (copy, nonatomic) NSString *identifier;
- (id)initWithName:(NSString *)name identifier:(NSString *)identifier;
+ (instancetype)synchronWithName:(NSString *)name identifier:(NSString *)identifier;
View SnapshotWithMarkerView.swift
func generateMap(with coordinates: [CLLocationCoordinate2D]) {
var annotationViews = [MKMarkerAnnotationView]()
let startCoord = coordinates.first!
let endCoord = coordinates.last!
annotationViews.append(createMapMarkerAnnotation(text: "A", coordinates: startCoord, color: .green))
annotationViews.append(createMapMarkerAnnotation(text: "B", coordinates: endCoord, color: .green))
let snapshotter = MKMapSnapshotter(options: options)
snapshotter.start { snapshot, error in
View QuadBezier.swift
class ViewController: UIViewController {
var bezier: QuadBezier!
let pathLayer: CAShapeLayer = {
let layer = CAShapeLayer()
layer.lineWidth = 5
layer.strokeColor =
layer.fillColor = UIColor.clear.cgColor
return layer
View AsyncTest.swift
class MyAppTests: XCTestCase {
func testIets() {
let expectation = self.expectation(description: "doSomething")
AsyncClass().doSomething {
wait(for: [expectation], timeout: 5)
View Iso8601.swift
// Personally, I would have done this on `DateFormatter` extension, but
// did it on Formatter so it would work with provided code snippet.
extension Formatter {
static var iso8601: DateFormatter = {
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.timeZone = TimeZone(secondsFromGMT: 0)
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS"
return formatter
View RemoveAnnotations.swift
func removeAllAnnotations() {
guard let document = document else { return }
for i in 0..<document.pageCount {
if let page = i) {
while page.annotations.count > 0 {
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