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A podcast by iOS developers for iOS developers, delivering news, tips, and rants for professional iOS/Mac developers, with something for enterprise and indie developers alike. Hosted by Darryl Thomas & John Sextro.
 
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Sometimes we run into issues where SwiftUI doesn't quite do what we need. In some cases, SwiftUI views are powered by UIKit under the hood. Wouldn't it be great (and devious) to dig into the underlying UIKit views to customize things when vanilla SwiftUI just won't cut it? In this episode we'll look at a technique for discovering the UIKit undernea…
 
One of the most impactful things you can do to improve productivity is to improve turnaround time when iterating on features. Playgrounds and Xcode Live Previews are great, but both have their limitations. In this episode we will explore how to utilize hot module reloading to have the simulator automatically reflect your changes when you save. It's…
 
Context menus are a great affordance for performing related actions to a UI element. Users can tap and hold to view the context menu, and the gesture is consistent across the OS so users will likely already be familiar with it. In this episode we'll show how to set up a basic context menu with a custom preview with normal and destructive actions.…
 
This is a discussion and code overview of another implementation of mapping models using key paths with a special guest, Antoine van der Lee! In this episode we talk about his initial goals and constraints, and some of the design tradeoffs he made while designing a solution that would give him a bidirectional mapping between Core Data entities and …
 
In this episode we migrate our collection view to use the new cell registration API. Using this API we no longer need to cast dequeued cell types to our custom types. Instead, we set up the registration object with the cell type and the data we'll be passing to each cell. This further reduces the code we have to write in our datasource implementati…
 
With UITableView no longer being encouraged for use, we need to replace this behavior with UICollectionView. This is where UICollectionViewListLayout comes into play. Using this layout we can get the familiar table view appearance in plain and grouped styles (as well as additional styles to support sidebars on iPad and macOS). This includes support…
 
I've been working on rendering waveforms using mathematical functions and have found the experience to be both fun and enlightening. In this episode we will develop a method to render arbitrary functions using a Shape, then explore some mathematical concepts that can help us render a nice looking waveform that could be use to indicate activity in s…
 
With the introduction of LazyVGrid and LazyHGrid In iOS 14 we now have access to much more powerful grid-based layouts in SwiftUI. In this episode We will examine the different types of layouts we can accomplish with flexible, fixed, and adaptive sizing for our rows and columns. We'll look at how animations work between different layouts, and how t…
 
iOS 14 Beta is now available and one of the new features is Lazy stacks. With a normal stack, all the layout happened at once, which meant poor performance for large lists of content, grids, etc. With Lazy stacks the views are only created when they first come on screen, greatly increasing the usefulness of stacks for large or infinite collections …
 
Before Swift 5 we used to write our own Result type to contain a value or an error (but never both). A lot of 3rd party libraries brought along their own as well. Then Swift 5 came and brought us Result. Not only is it slightly different than the ones we might be familiar with, Swift's Result type also has some useful functionality up its sleeve.…
 
Sometimes we need to create variants of our icons. This can be done by using template images and using a UIImageView with a tintColor change, however sometimes this isn't feasible. We can use our icons along with a mask to create new images of whatever color we want. In this episode we'll use UIGraphicsImageRenderer to quickly draw a new dimmed ima…
 
Working with dates is a task that is universally applicable to Swift developers. Particularly when dealing with an API, dates can arrive in all shapes and sizes. We‘ll examine some of the common ones such as ISO 8601, show how to parse these formats into Date instances, and how to use DateFormatter to display them back again as a string. We‘ll also…
 
UITableView can support scrolling through many rows of data, however fetching large amounts of remote data can slow down your app, use up too much memory, and bog down your web server. This is all wasteful if users aren‘t ever going to scroll down that far. In this episode you‘ll learn how to perform automatic UITableView pagination using an easy t…
 
In order to use CloudKit to read or write private data (or to write in the public database) the user will have to be signed in to iCloud on their device. If they are not, they'll not have a great experience, and things won't work. In this episode we'll check the account status before trying to save a record in CloudKit. We'll also respond to the no…
 
Discussion: Your App Build Pipeline Dependency management Carthage Punic - Clean room implementation of Carthage CocoaPods SPM Build systems CircleCI Travis XCTool from Facebook Xcode Server Are you using it? Let us know @iohyespodcast Darryl's Pick Punic, Clean room implementation of Carthage Brought to you by: Braintree (Visit Braintree.com/yes t…
 
Discussion: Energy Profiler For more info see Ep. 104, Power Struggles Apple really wants us to be good citizens of the battery. Apps that quickly drain the battery will be shunned by users Remember the Facebook background audio “bug” (some say ploy to allow the fb app to stay alive in background) “App as patient” metaphor iOS Energy Gauge / Energy…
 
Discussion - Allocations and Leaks instruments Extraordinarily hard to spot Tough to find offending code without help from tools Unbounded Memory Growth (memory growth without a chance to collect (deallocate) memory True Leaks (retain cycles) Allocations Generation Analysis Tracks allocations still resident when the generation is marked - As you do…
 
Darryl and Nolan are joined by Amro Mousa and Matt Massicotte to discuss the WWDC 2016 Keynote and Developer State of the Union. Also, Whisky. The Whiskies Mars Iwai Tradition Japanese Whisky Amrut Fusion Single Malt Whisky Laphroaig Single Malt Whisky - 10 Year Keynote Pre-keynote observation Hated the music Apple TV Events app worked fine Tim tak…
 
Discussion - WWDC Wish List John Get serious about home automation, maybe make Apple TV an automation hub Siri as a Service (3rd party integration) Refactoring for Swift (in Xcode) Announce date to sunset Obj-C Xcode for iPad Pro Darryl More voice command vocabulary. Something like AppleScript dictionaries? Make Buttons Great Again Better accessibi…
 
Discussion Swift 3.0 To be available later this year * [Winding Down the Swift 3 release - Chris Lattner](http://thread.gmane.org/gmane.comp.lang.swift.evolution/17276) * New “blue sky” proposals will be considered for post-3.0 development (~August) * Generics features (among other dependencies) are preventing the previously-planned ABI stability *…
 
Discussion Testing normal networks (aka, not the US) 62.5% of the world’s 3.2 Billion internet users have 2G connections (or worse). That number is growing. LTE speeds aren’t going to catch up for at least a decade if not much longer. When building robust networking between your client apps and your services, the common case should be the default c…
 
Discussion Auto Layout Stack Views, FTW (Auto Layout without constraints) (New in iOS 9, similar to what’s available in watchOS and NSStackView, which is available from OS X 10.9) UILayoutGuide New in iOS 9 Defines a rectangular geometry that can interact with Auto Layout Eliminates the need (in many cases, at least) for views that are included sol…
 
John and Darryl compliment each other and congratulate Nolan and Chad. Discussion Congratulations to the O'Brien family on the birth of Evelyn Jane! Evelyn Jane O'Brien joined her parents and 2 sisters at 3:32am, Feb 20th 2016 Baby and Mama are healthy and doing well ???????????????????????????????????????? — Nolan O'Brien (@NolanOBrien) February 2…
 
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