Scroll Views Inside Scroll Views
By Ole Begemann More about me and contact info May 21, 2014 Last update: June 30, 2014 Update June 30, 2014: Updated to reflect changes I made to OLEContainerScrollView’s public interface. The container scroll view now exposes a read-only contentView property. You should add any subviews you want managed by the container scroll view directly to its content view. In this article, I am introducing O
Core Data Concurrency Debugging
By Ole Begemann More about me and contact info June 11, 2014 Last update: June 23, 2014 In iOS 8 and OS X Yosemite, Core Data gains the ability to detect and report violations of its concurrency model.1 I think this is a very valuable feature because accessing a managed object context from the wrong queue is a simple mistake to make and can be fatal if it causes your users’ data to get corrupted.2
Swift Support in CodeRunner
I am a big fan of CodeRunner, Nikolai Krill’s Mac app that lets you quickly run few lines of code without the need to create a project or to even save the file first. I have used it primarily for testing Objective-C snippets until now, but naturally I would also like to use it with Swift. In this post, I want to show you how to add Swift support to CodeRunner. Playgrounds and the Swift REPL Arguab
NSProgress
Added a disclaimer about some downsides of NSProgress that I didn’t mention when I wrote the article. Update October 16, 2018: Five years after its introduction, it’s safe to say that NSProgress (or Progress in Swift) isn’t universally loved among developers in the Apple community. While this article addresses some issues, it does paint a fairly rosy picture and ignores some substantial problems,
NSArray Binary Search
By Ole Begemann More about me and contact info July 10, 2013 Last update: July 11, 2013 The other day I learned that NSArray comes with a binary search method named indexOfObject:inSortedRange:options:usingComparator:. Using this method can greatly speed up searching but requires the array to be sorted. containsObject: and indexOfObject: You are probably familiar with the most common methods for s
Compiler Warnings for Objective-C Developers
By Ole Begemann More about me and contact info April 25, 2013 Last update: December 13, 2013 Compiler warnings are one of the most helpful tools for developers. The compiler can not only warn you about obvious mistakes (such as a method you forgot to implement); it also identifies many code patterns that, though syntactically correct, are potentially dangerous (like signed/unsigned conversion) or
10 Things You Need to Know About Cocoa Auto Layout
By Ole Begemann More about me and contact info March 31, 2013 Last update: March 3, 2014 Working with Cocoa Auto Layout for the first time is very different from the springs and struts model Cocoa developers have known for more than a decade. Despite the complexity of Auto Layout, I have found that you need to understand just a few basic rules to make the concept click. This article is an attempt
Automating Strings Extraction From Storyboards for Localization
Automating Strings Extraction From Storyboards for Localization Update April 24, 2014: I just learned that Apple does in fact provide a coomand line tool named AppleGlot that supports incremental localization of .strings files, NIBs, and storyboards. AppleGlot just got updated to version 4.0 (v159.1) on April 15, 2014, and the release notes list support for Xcode 5 file formats. I haven’t tried it
New Undocumented APIs in iOS 6.1
By Ole Begemann More about me and contact info February 5, 2013 Last update: February 7, 2013 (Or: What The Hell Is MPGobblerGestureRecognizer?) Now that Apple has released iOS 6.1, I wanted to see whether the new OS version contained any exciting new APIs beside the rather meager additions in the public API diffs. With the help of Nicolas Seriot’s excellent iOS Runtime Headers repository, I compi
UDID Replacement APIs in iOS 6
By Ole Begemann More about me and contact info September 20, 2012 Last update: September 24, 2012 In a last minute change to iOS 6, Apple added an option for users to opt out of targeted advertising. The setting can be found in the iOS Settings app under General > About > Advertising. I see no reason why Apple did not place it in the more obvious new Privacy section other than to hide it from most
Revisiting the App Launch Sequence on iOS
In June 2011, I blogged about the App Launch Sequence on iOS for the first time, illustrating what really happens under the hood between the launch of an iOS app and the application:didFinishLaunchingWithOptions: method. Since that time, Apple has revised the default launch sequence in their iOS app project templates, so it is time for an update to the original post. Flowchart Flowchart of the def
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Strings in Swift 1
There is a Bug in the NSFetchedResultsControllerDelegate Documentation
iOS Passbook Tutorial
Update on Remote View Controllers