Our DNA is written in Objective-C

Jump

Bug: NSCollectionView Move Sections Crash

We are so foolhardy that we are using NSCollectionView in an internal project that gets widely used by an enterprise client of ours. We found this latest crashing bug while updating the application for macOS 10.12 wich is where the issue first appeared.

The only workaround at this time is to remove animation via animator() and replace it with a reloadData. Thus we vote NSCollectionView for worst Apple API on macOS.

This bug is filed as rdar://28337446 and on Open Radar.

Read more

BSA Banner

DTFoundation 1.7.11

With the prior update to DTFoundation having been 5 months ago, there were two main areas where some tweaks were necessary: support for tvOS and fixing a build error on Xcode 8.

Read more

LLVM Crash

I found this LLVM compiler crash when updating a project for building with Xcode 8. At first I thought it had to do with #if DEBUG because the crash didn’t occur when I removed the conditional compiling block. But further experimentation showed that it is a specific line in this block that is causing the issue.

It is filed as rdar://28318984 and on Open Radar.

Read more

Missing TestFlight Builds

I could have sworn, that I uploaded build 1.0.6 (28) of a client’s app to his iTunes Connect before leaving the keyboard for the night. The next morning it still showed build 15. Turns out TestFlight makes some builds disappear, here’s what I learned, why.

Read more

Enhancement: Make NSTextList Public

Whenever I am tasked with adding a rich text editor to an app, I check if Apple has since done something in UIKit to support lists. Since they revamped the text system in iOS 7, unifying large portions with how they are dealing with text on macOS, I am getting my hopes up for every new release of iOS.

macOS is using the NSTextList class to represent lists and the code below is provides proof that this class also exists on iOS. So this Radar requests – probably not for for the first time – for NSTextList to be made public. It is filed as rdar://28254852 and on Open Radar.

Read more

Asynchronous NSTextAttachments (2/2)

In the first part of this two-part blog post, you saw how NSAttributedString works with remote images when parsing HTML, namely synchronously downloading them. I teased that I found a way to have NSTextAttachment also work asynchronously. In this second part I will walk you through how this is achieved.

Read more

Asynchronous NSTextAttachments (1/2)

In iOS 7, Apple introduced the NSTextAttachment class for embedding images into attributed strings. OS X, pardon macOS, did have this feature much earlier, already as early as 2001 in version 10.0 “Cheetah”. I suspect that they needed 7 years to migrate because the first needed to revamp the inner workings of UITextView and UITextField to natively work with attributed text, as well as modernize CoreText into what is nowadays referred to as TextKit.

With iOS 10 being released, we now have 3 major iOS releases supporting text attachment in standard UIKit views. About time, that we start using text attachments for displaying inline images in rich text.

Read more

An Update on Custom Modal Presentations

Customizing a modal presentation of a view controller would be tricky before iOS 7. It got much easier with the addition of the transitioningDelegate protocol. This delegate would be able to vend an animation controller and an interaction controller for presentation and dismissal on the view controller which implemented them.

Without that, if you wanted a “burger menu” then you had to implement a custom container controller like I did with DTSidePanel in DTFoundation 1.4, three years ago. Things have gotten much easier a year ago.

A client of ours liked the way the Linked In app showed related apps in a modal side panel and so I went to research how you would that most reusably nowadays.

Read more

Survival of the Swiftest

While preparing for my talk for mDevCamp 2016, I was working on a new project interfacing with a RESTful web service. This allowed me to design the API without having to consider compatibility with Objective-C. As a result I could employ several advanced Swift techniques, and in this talk I am explaining these.

Read more

mDevCamp 2016

Conferences in movie theaters seem to be thing these days. A thing we like! This year’s sixth instalment of mDevCamp was the first time with comfortable seats and an unobstructed giant view of the speaker’s slides from every angle.

Read more