Friday, October 02, 2015

Changing UITextView's textContainer.layoutManager.delegate to your UIViewController Swaps Line Break from Word to Character Wrap

TL;DR Don’t assign UITextView.textContainer.layoutManager.delegate to your UIViewController, bad things happen. 
Versions: OS X 10.10, 10.11 Xcode 7.0.x iOS SDK 8, 9 

Some of the highlight WWDC 2013 sessions for me where those about Text Kit. That was largely because I was working at Dow Jones on The Wall Street Journal and Barron’s iOS apps which had native text layout code. It worked extremely well, but it was largely Core Text, and it wasn’t the easiest to maintain. I thought we might be able to replace a lot with Text Kit. Unfortunately I never got the chance, but I was always curious to try Text Kit’s capabilities.

Fast forward a few years and I got my change this past week. Designers handed me a screen that looks like this:

Text Kit Design

What I always remembered about Text Kit was the easy way to exclude paths from the layout for things like images and the text could flow around it.

To refresh my memory on how to do that, I did some searching and came across Ray Wenderlich’s Text Kit Tutorial, Updated with Swift. Great, read the article, downloaded the sample, and started using the UIBezierPath calculation stuff in my real project.

That’s where things went off the rails but I didn’t realize it until today. You see the tutorial had this:

let exclusionPath = timeView.curvePathWithOrigin(
textView.textContainer.exclusionPaths = [exclusionPath]

The method curvePathWithOrigin was calculating a round UIBezierPath because the tutorial was inserting a round graphic into the UITextView. I needed to create a rectangular UIBezierPath (see orange box in above image), but didn’t know you could do. Maybe it was the pain from a hand injury, maybe just ignorance or I forgot, but I didn’t get it.

Of course the round bezier path from the tutorial was not flowing text around the rectangle image correctly. It all seems to obvious in hindsight.

I tried many things to fix this issue. One of those was crawling down UITextView’s internal object tree and setting textContainer.layoutManager.delegate to my UIViewController instance. I usually never do things like this but again I probably wasn’t thinking very clearly.

Setting the delegate appeared to make the text flow better because character wrapping became the default, so I left the delegate assignment in. What a mistake!

When I realized how stupid I was being with UIBezierPath and used a rectangular exclusionPath, UITextView was defaulting to character wrapping instead of word wrapping.

Of course I was going through the Six Stages of Debugging:

I finally got to Stage 5 when I built up a sample line by line until I figured out setting the textContainer.layoutManager.delegate to my UIViewController instance was a really dumb idea.

Sometimes when writing code, you make bad choices and it takes a while to figure that out...

How To: Switch an Apple Watch to a new iPhone

I just got an iPhone 6s 128 GB and I remember reading an iMore article on the merits of doing a clean phone setup or restoring from a backup mentioning how to switch the Apple Watch to a new iPhone. Here’s a direct link to the Apple Support article.

This procedure is way to complicated. The iPhone setup experience doesn’t know anything about Apple Watch, which is ridiculous.

Wednesday, September 16, 2015

Inner Exception is on Apple News! Just search for "Inner Exception"

iOS 9 is out now and one of the big new features is News and Inner Exception is there!

I didn’t really expect that Apple would take a blog like this into the News pantheon, but they did and it’s live.

Turns out the old logo was so poorly designed by me, it really looked terrible in Apple News, so I made a new one.

InEx  Orange

Since I look at Menlo all day long in Xcode and this is mostly a coding blog, it seemed like the right choice.

Friday, August 21, 2015

Just discovered iTunes Connect - Manage iCloud Download Settings

When you have an app for sale and you haven’t logged into iTunes Connect for a while, you don’t often see new features added. The Manage iCloud download settings for this app in the Pricing tab is one such feature that escaped my attention…until now!

Mange iCloud Download Settings

Super handy if you need to control this more tightly.

Friday, July 31, 2015

How To Write a Swift Generic Function Based Only On Return Type

TL;DR Annotate the return variable with a type, e.x. let foo:String? = Utility.nullableValueFromKey(“identifier", dictionary: jsonDictionary)
Versions: OS X 10.10.4  Xcode 6.4 iOS SDK 8.4 

When I started working with Objective-C coming from .NET, one of language features that I missed the most was Generics. They solve a whole class of problems that are tedious and/or require way more code than without generics. When Swift was announced with Generics...

Finally...It's Done

But Generics can be hard, thinking in T for any giving problem can make you a little crazy, especially when the compiler keeps yelling at you.

In Swift 1.0, I used generic functions to help parsing JSON server responses, the functions worked, but they were less than ideal.

The typical problem I wanted to solve was getting a primitive type out of the response dictionary that could be null.

I ended up with this function to do the trick:

class func originalNullableValue<T>(valueType: T, key: String, dictionary: NSDictionary) -> T? {
    var value:T? = nil
    var valueTemp = dictionary[key] as AnyObject! as? T
    if valueTemp != nil {
        value = valueTemp!
    return value

Ugly! Why did I end up with this? Either I wasn’t smart enough to figure this out or the 1.0 compiler wasn’t.

Smart, but not Smart Enough

Getting either me or the compiler to figure out what type T was without passing an argument of that type into the method, was, well let’s just say it was the solution I found.

What I wanted was this:

class func nullableValueFromKey<T>(key: String, dictionary: NSDictionary) -> T? {
var value:T? = nil
    var valueTemp = dictionary[key] as AnyObject! as? T
    if valueTemp != nil {
        value = valueTemp!
    return value

So I dusted off the original method and tried making it what I wanted with Xcode 6.4 & Swift 1.2.

Defining it works fine, but If you attempt to call it:

let foo = JSONUtility.nullableArrayFromKey("fooBar", json: Dictionary<String, AnyObject>())

The compiler returns this error:

Argument for generic parameter 'T' could not be inferred

I have no way to know/test if this is the same error that caused me trouble in Swift 1.0, but this time, either I or the compiler were smart enough to figure it out!

All you have to do is add the type to the variable declaration:

let bar:String? = JSONUtility.nullableValueFromKey("name", dictionary: Dictionary<String, AnyObject>())

Flawless Victory

Thursday, July 30, 2015

No Dan Gillmor, Government Should Do Nothing About Android Security

I nearly burst from laughter after reading this tweet and then article by Dan Gillmor:

What’s so funny? The free market is working in this case exactly as intended. A company in the market, e.x Apple, provides mobile devices that are usually secure and updated. Some consumers have voted with their dollars that isn’t as important to them as other criteria, so they bought an Android phone. There is no surprise here that if you buy an Android device, you highly likely will not get updates of any kind, security or otherwise. 

What criteria stops people from buying an Apple device? Let’s return to Mr. Gillmor:

Apple's iOS devices, of course, are part of a tightly controlled ecosystem, and while Apple is far from perfect on security, it does update iPhones. But we shouldn't be required to turn over our computing and communications to control-freak companies in order to get necessary security updates.

So let me get this straight? Mr. Gillmor doesn’t want Apple devices because Apple is a “control-freak” company, so he invites the control-freak government to use laws &  regulations & force Android implementors to be more control freaks about updates…like Apple. LOL. Sure, the government is always the lightest touch!

If Android users thought updates and security where higher priorities than cheap phones or “open source” software, then they wouldn’t have bought an Android device.

Returning this as not a bug, working as intended!


Google made this mess, they can still fix it. They already offer an Android Bug Bounty. They have a generic Patch Reward Program.

Instead of the heavy hand of laws and regulations, Google should start an Update Rewards program.

Every carrier or vendor that releases Android updates in a timely fashion (say within 1 month) gets a payment from Google.

Security Updates pay more than Feature Updates. To really sweeten the pot, Google can pay per user upgraded, get some vendor/carrier incentive to update as many users as possible.

Vendors/carriers have such thin margins, seems like they don’t have the money to cover testing and deploying Android updates without taking a loss.

Use some of that ad revenue to cover the costs. I mean, advertisers should be clamoring for this. After all, how can they trust the ad profiles Google vends with compromised devices?

Monday, July 13, 2015

How to Completely Eliminate UITableView Content and Separator Indent on UITableVIewCell


overridefunc viewDidLoad() {



    self.tableView.separatorInset = UIEdgeInsetsZero

    self.tableView.layoutMargins = UIEdgeInsetsZero



override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {

    cell.layoutMargins = UIEdgeInsetsZero


Versions: OS X 10.10.4 Xcode 6.4 iOS SDK 8.4

Almost every iOS app has at least one and usually more UITableViews and associated UIViewController or UITableViewControllers to manage them.

The view’s ubiquity has to make implementing it very tough and I don’t envy the team that has to account for all the use cases.

Over time, UITableView, UITableViewDelegate, UITableViewDataSource, and UITableViewCell have become very large. Throw in their subclasses, UIScrollView & UIView, and developers have to remember a lot of stuff to get all the behavior they want.

Or in this case, don’t want. UITableView enforces default layout margins and separator margins that are not obvious…once you use AutoLayout.

This is what you see in your storyboard:

UITableView Storyboard


This is what you see in the app:

UITableView Insets

Notice the left hand margin? There is no option you can change in the Storyboard to fix it, you just get an indent/margin/inset you didn’t ask for. The storyboard doesn’t show this, so I’m not sure if this is a bug in the Storyboard editor, or in runtime in UITableView.

What’s happened is that I added a few AutoLayout constraints to the left red bar (margins t: -8, l: -8, b: -9).

When I do this, the tableView.layoutMargins appear to be their default value of 8. It looks like without AutoLayout, UITableView resets layoutMargins to UIEdgeInsetsZero, but with AutoLayout, it either wants the default margins or there’s a bug.

You have to add the following code to fix the pre-cell tableView display:

override func viewDidLoad() {



    self.tableView.separatorInset = UIEdgeInsetsZero

    self.tableView.layoutMargins = UIEdgeInsetsZero

But that’s not enough to get the cells looking right. Based in part on this StackOverflow post, but with my own testing, you have to implement the delegate callback willDisplayCell like this:

override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {

    cell.layoutMargins = UIEdgeInsetsZero


Why do we have to set layoutMargins again in willDisplayCell? Apparently the cell’s layoutMargins get reset again right UITableView decides where to draw the separator line, so you have to make them whatever you want. Curiously, willDisplayCell has existed since iOS 2, but I don’t remember needing to use it before iOS 8.

Now we get what we want.

UITableView Insets fixed

Another Workaround That’s Incomplete...

This other StackOverflow post mentions the UIView property preservesSuperviewLayoutMargins. It defaults to NO/false, but for a UITableViewCell is set to YES/true.

You could have mostly solved the problem by explicitly setting that property to NO/false, but it would not have fixed the separator issue.

iOS 9 Beta 

I haven’t run through this on iOS 9 beta, so I don’t know what the the default indent situation is there.

Friday, July 10, 2015

Change the Global Tint in an Xcode Storyboard

TL;DR Look at the File Inspector tab (the one with the blank document) of your storyboard

Whenever I go looking for the Global Tint defined in the main storyboard in Xcode, there’s always a moment of cognitive dissonance.

My problem is that I go looking for some kind of Window object, which of course is how you’d do it programmatically (in Swift):

UIApplication.sharedApplication().delegate?.window!!.tintColor = UIColor.redColor()

The double !! after window is not a typo according to Xcode, though it sure looks weird.

Anyway, I guess nobody wants to make UIWindows things in Storyboards, so this property is stashed under the File Inspector tab!

Friday, June 12, 2015

GitHub is Not Your Resume

Your resume is your resume. 

Your released apps are your resume. 

Your released sites are your resume. 

Your published blog posts are your resume.

Your contributions to widely used open source software, some of which might be hosted on GitHub, are your resume. 

Your public repo that you're the sole contributor to and isn't a shipping product is not your resume

Hiring managers screening applicants don't have time to pull 3+ repos, attempt to compile them, and then read the source to see what a 10x dev/rockstar/ninja/special snowflake you are.

Thursday, May 14, 2015