Weekly bite-sized screencasts on iOS development.

Displaying Episode 161 - 180 of 261 in total

NSPredicate

Episode #101 | 9 minutes | published on 01/02/2014
Subscribers Only
In this episode we look at a powerful built-in Foundation class called NSPredicate. With predicates we can easily filter large collections of data based on values contained in the collection.

Particle Systems

Episode #100 | 20 minutes | published on 12/19/2013
Subscribers Only
In our special 100th episode I dive into a fun little class called CAEmitterLayer. Using this class we can create cool particle effects such as fire, water, smoke, clouds, or a fountain of stars.

Parsing and Formatting Dates

Episode #99 | 14 minutes | published on 12/12/2013
Free Video
In this episode we cover a basic but fundamentally important topic: dealing with dates & times. Particularly when dealing with an API, dates can arrive in all shapes and sizes. We'll examine some of the common ones, talk about how to parse these formats into NSDate instances, and how to use NSDateFormatter to display them back again as a string.

Camera Capture

Episode #98 | 21 minutes | published on 12/05/2013
Subscribers Only
In this episode we grab image data live from the camera on an iPhone 5. We discuss inputs and outputs, image formats, and finally (you guessed it) put a mustache live on each face in the video frame using the face detection techniques demonstrated in Episode 96.

Scrolling Nub

Episode #97 | 23 minutes | published on 11/28/2013
Subscribers Only
In this episode I implement a fast scrolling "nub" to assist with scrolling through table views with many entries. The technique was lifted from the Dropbox app and I build a quick prototype of how it works.

Face Detection

Episode #96 | 16 minutes | published on 11/21/2013
Subscribers Only
In this episode we dive into CoreImage with a fun feature: detecting faces in photos! We also find the eyes & mouth positions and use Core Graphics to draw on our photo.

Fun with iBeacons

Episode #95 | 15 minutes | published on 11/14/2013
Subscribers Only
In this episode we take a look at implementing an iBeacon transmitter and receiver. Using this technology we can detect nearby beacons and range them in order to see how far away they are.

Upgrading an Old Project to XCTest

Episode #94 | 14 minutes | published on 11/07/2013
Subscribers Only
In this episode I upgrade the sample app created way back in Episode 4 using Kiwi to Xcode 5 and XCTest. Along the way, we're greeted with a number of warnings & errors that we have to address to get the Kiwi tests to run with XCTest.

Background Transfers

Episode #93 | 15 minutes | published on 10/31/2013
Subscribers Only
Background transfers are a new feature of iOS 7 where you can have the OS download files in the background and have them ready for your application when you launch it the next time. In this episode we write a simple image downloader that takes advantage of background sessions.

Background Fetch

Episode #92 | 14 minutes | published on 10/24/2013
Subscribers Only
In this episode we write an application that takes advantage of iOS 7's background fetch feature, allowing us to keep our application updated in the background so that the user doesn't have to wait for updated data when the application is launched.

AFNetworking 2.0

Episode #91 | 19 minutes | published on 10/17/2013
Subscribers Only
In this episode we take a look at the brand new design of AFNetworking 2.0. We'll convert our TuneStore application to leverage AFNetworking and clean up our View Controller by introducing a new class to handle the network plumbing. We'll also take a look at a handy UIKit category for easily managing an activity indicator's state.

Table View Images in iOS 7

Episode #90 | 10 minutes | published on 10/10/2013
Subscribers Only
In this episode we continue our example from Episode 89, using NSURLSessionDataTask to download images for our rows. We also see how we can benefit from the built-in cache settings of NSURLSessionConfiguration and how to efficiently request images while scrolling.

Networking in iOS 7

Episode #89 | 16 minutes | published on 10/03/2013
Subscribers Only
In this episode we take a look at the brand new NSURLSession family of classes. We'll consume the iTunes Affiliate Search API and show how to do a simple GET request.

Interactive View Controller Transitions

Episode #88 | 18 minutes | published on 09/26/2013
Subscribers Only
In this episode we continue our transition example from episode 86. We create a new InteractiveSwipe transition class that we can use for dismissal so the user can swipe the view controllers away instead of tapping a button.

Xcode 5 Autolayout Improvements

Episode #87 | 7 minutes | published on 09/26/2013
Free Video
This week we have another free bonus video on the improvements that Xcode 5 brings to Autolayout. As something that has been quite obnoxious to work with in the past, many people dismissed auto layout when it was introduced to iOS 6. With these improvements it is much more friendly and dare I say... usable?

iOS 7 View Controller Transitions

Episode #86 | 18 minutes | published on 09/19/2013
Subscribers Only
Now that the iOS 7 is out and the NDA has been lifted you can expect NSScreencast to cover lots of the new features. In this episode I show how you can take a simple stock modal transition for a color picker and create something more unique and playful that fits with the "swatch" theme.

Hello, iOS 7

Episode #85 | 7 minutes | published on 09/19/2013
Free Video
To celebrate the launch of iOS 7, here is a bonus free screencast covering a few of the concepts in iOS 7 such as the status bar behavior, tint color, and navigation bar transitions. We'll also take a look at Xcode 5 with a couple of the new features, including the integrated test runner.

xctool

Episode #84 | 8 minutes | published on 09/12/2013
Subscribers Only
Trying to run unit tests with xcodebuild leaves a lot to be desired. In this screencast I'll show you why xctool is a superior alternative. Quick, parsable build output and easy to follow pass/fail status on test runs make xctool worth checking out.

TDD View Controllers Part 2

Episode #83 | 18 minutes | published on 09/05/2013
Subscribers Only
We continue our TDD exercise, building a view controller one test at a time using Specta and OCMock. This time we introduce the alert view behavior for invalid logins, performing a segue for valid logins, and capturing arguments passed to mocks in order to affect the system, all in tests.

TDD View Controllers with Specta and OCMock

Episode #82 | 16 minutes | published on 08/29/2013
Subscribers Only
In this episode I cover test driving a UIViewController using Specta and OCMock. We'll first talk about how to verify that your storyboard is wired up correctly with all outlets & actions and then talk about how to isolate the view controller from other dependencies using mock objects.