treboc

import SwiftUI

struct ContentView: View {
  let size: CGSize = CGSize(width: 200, height: 200)
  @State private var positions = [CGRect]()
  @State private var counter = 0

  var body: some View {
    ZStack {
      ForEach(positions, id: \.self) { position in

johnno1962

// First, install InjectionIII.app from the Mac AppStore
// https://apps.apple.com/us/app/injectioniii/id1380446739?mt=12

// Make these changes to your code:

// add the following to application(didFinishLaunchingWithOptions:)
#if DEBUG
Bundle(path: "/Applications/InjectionIII.app/Contents/Resources/iOSInjection.bundle")?.load()
#endif

tclementdev

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

chriseidhof

import Foundation

// A lens is a getter and a setter combined
struct Lens<Whole, Part> {
    let get: (Whole) -> Part
    let set: (inout Whole, Part) -> ()
}

// We can create a lens from a key path
extension Lens {

cgiffard

Post ID, Post Timestamp, Username, Text (including machine posts)
"71081328","2017-03-17T10:03:07Z","voguemagazine","Miss Rodeo New Mexico 2016 Shows Vogue The Ropes | American Women — https://app.net/b/rqg5g"
"71081327","2017-03-17T08:04:35Z","epicurious","Classic Potato Kugel for Passover | Epicurious — https://app.net/b/rqg56"
"71081326","2017-03-17T07:07:15Z","cgiffard","Midnight PST and things are still going?"
"71081325","2017-03-17T06:45:35Z","joanna","But not forgotten. :-)"
"71081324","2017-03-17T06:43:58Z","joanna","Gone?"
"71081323","2017-03-17T06:39:02Z","joanna","Still have this channel. I don't want to close my browser!"
"71081322","2017-03-17T06:38:38Z","phoneboy","Yup, looks like the API server has shut down."
"71081321","2017-03-17T06:38:18Z","joanna","Global won't refresh on Riposte."
"71081320","2017-03-17T06:37:53Z","djscolam","#NowPlaying End Theme - Zero 7 [youtu.be] Requested by: @berg #MondayNightDanceParty #BeExcellentToEachOther. //@adnprinter #adnprinter

algal

// known-good: Xcode 8, Swift 3

import Foundation

var standardError = FileHandle.standardError

extension FileHandle : TextOutputStream {
  public func write(_ string: String) {
    guard let data = string.data(using: .utf8) else { return }

erica

public struct Error: ErrorType {
    let source: String; let reason: String
    public init(_ source: String = __FILE__, _ reason: String) {
        self.reason = reason; self.source = source
    }
}

protocol Contextualizable {}
extension Contextualizable {
    func functionContext(function : String = __FUNCTION__) -> String {

capttaco

import CoreData

protocol Fetchable
{
    typealias FetchableType: NSManagedObject
    
    static func entityName() -> String
    static func objectsInContext(context: NSManagedObjectContext, predicate: NSPredicate?, sortedBy: String?, ascending: Bool) throws -> [FetchableType]
    static func singleObjectInContext(context: NSManagedObjectContext, predicate: NSPredicate?, sortedBy: String?, ascending: Bool) throws -> FetchableType?
    static func objectCountInContext(context: NSManagedObjectContext, predicate: NSPredicate?) -> Int

mackuba

Here's my own list of the interesting stuff announced during this year's WWDC, collected from the keynotes, various Apple docs, blog posts and tweets.

If you're planning to watch the videos, I really recommend this Mac app that helps you download and watch them: https://github.com/insidegui/WWDC.

OS X El Capitan

http://www.apple.com/osx/elcapitan-preview/

• split view - two apps side by side on full screen

steipete

This is the code path that changed the status bar orientation on iOS 7:

* thread #1: tid = 0x698dbf, 0x00085830 WindowRotationIssue`-[AppDelegate application:willChangeStatusBarOrientation:duration:](self=0x7a041f90, _cmd=0x0137a18d, application=0x79e39cc0, newStatusBarOrientation=UIInterfaceOrientationPortraitUpsideDown, duration=0.80000000000000004) + 96 at AppDelegate.m:23, queue = 'com.apple.main-thread', stop reason = breakpoint 3.1
  * frame #0: 0x00085830 WindowRotationIssue`-[AppDelegate application:willChangeStatusBarOrientation:duration:](self=0x7a041f90, _cmd=0x0137a18d, application=0x79e39cc0, newStatusBarOrientation=UIInterfaceOrientationPortraitUpsideDown, duration=0.80000000000000004) + 96 at AppDelegate.m:23
    frame #1: 0x00bb6ab5 UIKit`-[UIApplication setStatusBarOrientation:animationParameters:notifySpringBoardAndFence:] + 242
    frame #2: 0x00bfa8e4 UIKit`-[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 4761
    frame #3: 0x00bf9646 UIKit`-[UIWi