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Displaying Episode 169 - 192 of 278 in total
#110
110 swipe to reveal redux poster 1280
In this episode we fix the problem of a scroll view blocking touches to a UITableViewCell by forwarding touch events from the scroll view and onto a delegate, which manages the cell's highlighted state properly.
#109
109 mdmcoredata poster 1280
In this episode we add Core Data to our Weight Tracker application, but we lean on a new library called MDMCoreData to set up our Core Data stack for us. Using MDMCoreData we can get a sensible parent/child context set up where the main context is a child of the parent writer context. We also leverage a handy class that dovetails with NSFetchedResultsController to display records in a UITableView.
#108
108 unwinding segues poster 1280
UIStoryboards can help visualize your screen flow and even describe how to transition between view controllers using segues. In this episode I'll show you how you can take advantage of built-in support to unwind segues to back to where you came from. I'll show the automatic way as well as how to manually unwind a segue.
#107
107 swipe to reveal cells poster 1280
In this episode I customize UITableViewCell to provide swipe to reveal behavior, similar to Mail.app. We use UIScrollView's delegate methods to ensure that we never land mid-way through the swipe, raise notifications to make sure only one cell is open at a time, and we use a help app called Reveal to assist us in visualizing the view hierarchy.
#106
106 uitableviewcell swipe action poster 1280
In this episode I cover how to extend UITableViewCells to provide a swipe action, marking an item as read or unread. Combined with a nifty little progress animation, this adds functionality to your table view cells without requiring extra buttons or action sheets.
#105
105 strong versus copy poster 1280
In this episode we examine the difference between strong and copy semantics for properties, and why you'd favor copy for types such as NSString and NSArray.
#104
104 blur poster 1280
In this episode we tackle how to implement an ever increasing trend in iOS 7 app design: blur. We start by doing it the "easy" way using UIToolbar, then move on to a more custom and flexible approach using our own blurred image.
#103
103 refactoring view controllers part 2 poster 1280
In this episode we wrap up our refactoring of a complex view controller, this time introducing a model, factoring out a new data source class, and more.
#102
102 refactoring view controllers poster 1280
In this episode I take a fairly simple application with a single view controller and examine how we can refactor it into more discrete parts.
#101
101 nspredicate poster 1280
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.
#100
100 particle systems poster 1280
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.
Shape
#99
099 parsing and formatting dates poster 1280
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.
#98
098 camera capture poster 1280
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.
#97
097 scrolling nub poster 1280
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.
#96
096 face detection poster 1280
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.
#95
095 fun with i beacons poster 1280
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.
#94
094 upgrading an old project to xctest poster 1280
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.
#93
093 background transfers poster 1280
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.
#92
092 background fetch poster 1280
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.
#91
091 afnetworking 2 0 poster 1280
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.
#90
090 tableview images in ios7 poster 1280
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.
#89
089 networking in ios7 poster 1280
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.
#88
088 interactive view controller transitions poster 1280
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.
Shape
#87
087 xcode5 autolayout improvements poster 1280
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?