lattner

Async/Await for Swift

• Proposal: SE-XXXX
• Authors: Chris Lattner, Joe Groff

Introduction

Modern Cocoa development involves a lot of asynchronous programming using closures and completion handlers, but these APIs are hard to use. This gets particularly problematic when many asynchronous operations are used, error handling is required, or control flow between asynchronous calls gets complicated. This proposal describes a language extension to make this a lot more natural and less error prone.

This paper introduces a first class Coroutine model to Swift. Functions can opt into to being async, allowing the programmer to compose complex logic involving asynchronous operations, leaving the compiler in charge of producing the necessary closures and state machines to implement that logic.

Anton3

The metatypes explanation

For every type T in Swift, there is an associated metatype T.Type.

Basics: function specialization

Let's try to write a generic function like staticSizeof. We will only consider its declaration; implementation is trivial and unimportant here.

Out first try would be:

rbobbins

PS: If you liked this talk or like this concept, let's chat about iOS development at Stitch Fix! #shamelessplug

Protocol-Oriented Programming in Swift

Speaker: David Abrahams. (Tech lead for Swift standard library)

• "Crusty" is an old-school programmer who doesn't trust IDE's, debuggers, programming fads. He's cynical, grumpy.

• OOP has been around since the 1970's. It's not actually new.

• Classes are Awesome

  • Encapsulation
  • Access control

SheffieldKevin

/**
 @brief Returns true if images have same meta. Width, Height, bit depth.
 @discussion Assumes images are non null.
*/
func doImagesHaveSameMeta(#image1:CGImage, #image2:CGImage) -> Bool {
    if CGImageGetWidth(image1) != CGImageGetWidth(image2) {
        return false
    }
    
    if CGImageGetHeight(image1) != CGImageGetHeight(image2) {

ZevEisenberg

osascript -e 'tell application "iOS Simulator" to quit'
osascript -e 'tell application "Simulator" to quit'
xcrun simctl erase all

mbigatti

import UIKit

extension UIView {
    func currentFirstResponder() -> UIResponder? {
        if self.isFirstResponder() {
            return self
        }
        
        for view in self.subviews {
            if let responder = view.currentFirstResponder() {

dlo

This gist outlines how to resize a view when a keyboard appears using Auto Layout (there are a bunch of code samples out there that manually adjust the view's frame, but that's just so 2013). The method I outline below works universally on both iPhone and iPad, portrait and landscape, and is pretty darn simple.

Setting Up

The first thing to do is to define our containing view controller, the view, and the bottom constraint that we'll use to adjust its size.

Here's HeightAdjustingViewController.h. We don't need to expose any public properties, so it's pretty bare.