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Bite-sized videos on iOS development.

The iOS landscape is large and changes often. With short, bite-sized videos released on a steady schedule, NSScreencast helps keep you continually up to date.

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In our catalog you'll find a wide variety of topics and UI frameworks.

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Showing episodes 217 - 240 of 508 in total
  • #292

    Dive Into Core Graphics

    In this episode we’ll learn how to draw images with core graphics, then watermark a photo by drawing text overlaid on top of it.

  • #291

    Dive Into Core Graphics

    In this episode we’ll leverage what we've learned to create a reusable control that will show progress as a path outlining a circle, complete with animation.

  • #290

    Dive Into Core Graphics

    In this video we’ll learn how to use custom drawing with CALayers to support implicit animations.

  • #289

    Dive Into Core Graphics

    Occasionally you will want to do some custom drawing, but not have that presented directly on the screen. Sometimes this is to "bake" the drawing into an image for faster scrolling performance (a single flattened image can be sent to the GPU easily without having to composite a bunch of views together). This is also often used to resize images that are too large for the intended view. This episode covers drawing to a custom context offscreen and obtaining an image out of it.

  • #288

    Dive Into Core Graphics

    In this episode, Sam shows how to draw text using Core Graphics. With this technique you can easily add text to images for pre-rendering, a technique we will see in another episode in this series.

  • #287

    Dive Into Core Graphics

    Sam shows how to use Core Graphics to draw images, which you might want to do if you want to blend techniques we’ve seen so far, such as clipping paths or gradients. Drawing images with Core Graphics is also useful to resize images if needed (perhaps if the API is returning one that is too large and you want to cache a thumbnail on device). You’ll also learn about a handy function to help you with aspect ratio math!

  • #286

    Dive Into Core Graphics

    Transforms allow you to draw things rotated, moved, or scaled differently than you specified. You can use this technique to reuse drawing operations where they only differ by some small factor (like drawing lines on a graph), to tilt things like text, or to correct issues where the drawn element is upside down or sideways. In this episode, Sam shares a helpful technique of drawing a grid with a highlighted "origin square" to make it obvious what the transforms are doing.

  • #285

    Dive Into Core Graphics

    Clipping paths allow you to control where drawing occurs by providing a path in which to limit future drawing operations. Since you can create arbitrary shapes with CGMutablePath (and UIBezierPath) this can be an essential technique to get the drawing effect in some situations.

  • #284

    Dive Into Core Graphics

    Gradients are slowly returning to be part of the common iOS design aesthetic once again (after iOS 7 introduced an entirely flat design paradigm). Subtle gradients can be used to create interesting designs, provide necessary contrast for drawing text on top of photos, and provide a realistic feel to custom controls. Learn how to create linear and radial gradients, how to define custom locations to control the position and "shape" of the gradient.

  • #283

    Dive Into Core Graphics

    What are color spaces? Sam discusses the common color spaces you might use and what they are used for. Why would you use these methods instead of just using UIColor? If you want cross-platform compatible drawing code, you’ll want to know how this works.

  • #282

    Dive Into Core Graphics

    Learn the basics of UIBezierPath and CGPathRef for representing drawing operations as a primitive type. Paths are incredibly useful to drawing and can be used to represent arbitrary lines, curves, and shapes.

  • #281

    Dive Into Core Graphics

    Learn how to create basic shapes using Core Graphics. We’ll start by creating a playground that we can use to quickly see the results of our work.

  • #280

    Dive Into Core Graphics

    Sam introduces the new series on Core Graphics, what to expect, and what the series covers.

  • #279

    We tackle some more complex (read: realistic) scenarios where the JSON structure doesn’t quite match the structure of the objects. We’ll do this by providing custom implementations of Encodable and Decodable, talk about keyed and unkeyed containers, and how you might be able to transform the date during the encoding process

  • #278

    Swift 4 finally answers the long-debated question of: How should I parse JSON with Swift? In this episode we'll take a look at the new Codable protocol in Swift 4, and talk about how to use JSONEncoder and JSONDecoder to serialize your objects into JSON and back again.

  • #277

    Hello CloudKit

    We finish the CloudKitNotesManager by providing a generic save and delete methods that we can use for any CKRecordWrapper type. We also implement a custom notification when a note is saved so that we can update an interested view controllers to update their UI.

  • #276

    Hello CloudKit

    In this episode we implement a CloudKit version of our NotesManager protocol. Along the way we'll implement a reusable query function and run into a limitation with Swift generics that we will have to work around.

  • #275

    Hello CloudKit

    Since our model objects will be backed by a CKRecord, we will leverage computed properties to marshal values back and forth to the record. Doing so in a type safe way gets pretty redundant, so we can reuse a lot of this boilerplate code by extracting a protocol we’ll call CKRecordWrapper. We can leverage this protocol to give us type-safe access to record keys and to provide default implementations of identifier, modifiedAt, and createdAt fields.

  • #274

    Hello CloudKit

    So far in this series we've been using CloudKit directly from our controllers. This can be somewhat limiting. It requires you to be online or everything fails, we may want to add a caching layer, or we might want to use CloudKit as a network synchronization layer, rather than a primary data store. In this episode we'll examine an architecture that will allow you to decouple your view controllers from CloudKit as a first step to achieving more flexibility with your CloudKit implementation.

  • #273

    In the refactoring series, Soroush mentioned a protocol he uses to make initializing view controllers from a storyboard as easy as adopting a protocol (and completely type-safe). In this episode we will build this using Swift protocol extensions. The end result is something you can easily carry with you from project to project.

  • #272

    Refactoring to Coordinators

    This episode wraps up the refactoring series by implementing the transition to the PhotosViewController. Ben and Soroush talk about the overall process and benefits of coordinators as a pattern to clean up view controllers and organize logic around how your app is stitched together.

  • #271

    Refactoring to Coordinators

    Moving on to the next segue in our storyboard, this time Ben and Soroush tackle the Add Review flow. They discuss naming of delegates, the ideal place to perform logic such as preparing a model to be saved and where mutations to the model live. They end up with a view controller that is completely decoupled from the AddReviewViewController and a better picture of what the coordinator tends to look like.

  • #270

    Refactoring to Coordinators

    In this episode, Soroush and Ben create the first delegate for a view controller in order to pull out the behavior a user might trigger by interacting with the view controller. This delegate conformance is added to our coordinator so this flow logic is in one place (and not in the view controller).

  • #269

    Hello CloudKit

    Saving records includes uploading any attached assets. For a good user experience, we should show the user the progress for any records that are being saved (or downloaded). In this episode we’ll see how we can get that data and show a progress bar for uploading photos. To do this we will take a look at a new class, CKModifyRecordsOperation.