Corbin Dunn
Redwood Monkey

Cocoa

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Code Reviews, Part 2: When to do them, and how to avoid them

Part 1 discussed why you should not be done code reviews. Part 2: When to do code reviews and how to not do them. If you are creating mission critical code, then by all means: have... [read more]
Cocoa, Coding
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Code Reviews, Part 1: Don’t do them.

You probably don’t need to be doing code reviews. Have confidence in the code you write, and understand it well. Click through to read all the details on why.
Cocoa, Coding
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Arduino: Tricks for fast Bluetooth LE data transfers

I’ve been using the Adafruit LE friend to do some data transfer tests. With the basic setup, I was sending 1 kB of data in about 9.5 to 10 seconds. That is horribly slow! About... [read more]
Cocoa, Coding

WWDC 2015: Improving the Full Screen Window Experience

For the past 10 years I’ve given a talk at every Apple World Wild Developer Conference (WWDC). Well, except for one. That was 2007 when I was busy working on UIKit for the iPhone 1.0.... [read more]
Apple, Cocoa, Coding

NSTableView Tips: Doing Animations with Core Data

For my “Cyr Wheel Pattern Editor” app I am using CoreData and an NSTableView. However, I’m sort of “manually” doing bindings for the array content itself to get animations in the View Based NSTableView. Here’s... [read more]
Cocoa, Coding

NSTableView Tips: View Controller per row

Sometimes you may find your application has rather complex rows, and you want an NSViewController to manage each row in a “View Based” NSTableView. This is fairly easy to do, and I did it in... [read more]
Cocoa, Coding

NSTableView Tips: Not delaying the first responder

I have a little home-brew Cocoa app for making Cyr Wheel patterns. The UI is built with an NSTableView and looks like this: Now normally when you try to directly click on one of the... [read more]
Cocoa, Coding
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Implementing delete in an NSTableView

I’ve seen many ways to implement delete in an NSTableView. Many are good. Many hardcode references to something they shouldn’t, and those are bad. Here’s an easy way: Subclass NSTableView and override keyDown: - (void)keyDown:(NSEvent... [read more]
Cocoa, Coding
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Why the API? NSTableView -preparedCellAtColumn:row:

I think I’ll do a few articles on why certain API was introduced in Leopard. I’ll start with one of the new methods in NSTableView: /* Returns the fully prepared cell that the view will... [read more]
Apple, Cocoa, Coding

Cocoa programmers: avoid writing to the user defaults when you don’t need to

[Edit: ecto ate this post, so I’m typing it in again!] I discovered that a lot of applications will unnecessarily write to NSUserDefaults. This causes your app to hit the disk when it shouldn’t, and... [read more]
Cocoa, Coding
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Getting rid of the undo warning in Xcode after saving

One of the most annoying dialogs in Xcode is the undo warning dialog you get when attempting to undo after a save. I do this all the time, and I hate the warning. Luckily, there... [read more]
Cocoa, Coding

Wake up and smell the cocoa

Cocoa

Your most important breakpoint in Cocoa

…..drumroll please…and it is…is: objc_exception_throw. You should always have this breakpoint setup in any Cocoa or Cocoa Touch app that you are building. How do you do it? In Xcode, Run -> Show -> Breakpoints... [read more]
Cocoa, Coding

Xcode code completion and your code

How can you become a faster Cocoa programmer? One way is to adequately name your variables, enums and classes. Let’s start with enums and take an example from something new to NSTableView in Leopard. This... [read more]
Apple, Cocoa, Coding

WWDC 2008

WWDC 2008! Howdy to my fellow Cocoa Developers. Take a look at the conference schedule: http://developer.apple.com/wwdc/schedules/ and be sure to come to my talk! Tuesday at 10:30 AM, iPhone for Mac Developers. If you have... [read more]
Apple, Cocoa, Coding
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Cocoa: willDisplayCell delegate method of NSTableView, [NSCell setTextColor], and “source lists”

Mac OS 10.5 added a “source list” highlighting style to NSTableView, with the API below for your reference: enum { NSTableViewSelectionHighlightStyleRegular = 0, NSTableViewSelectionHighlightStyleSourceList = 1, }; typedef NSInteger NSTableViewSelectionHighlightStyle; – (NSTableViewSelectionHighlightStyle)selectionHighlightStyle; – (void)setSelectionHighlightStyle:(NSTableViewSelectionHighlightStyle)selectionHighlightStyle; Source... [read more]
Apple, Cocoa, Coding
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Overriding shortcut keys in the NSOpenPanel or NSSavePanel

It recently came up where someone needed to override some of the default shortcut keys in the NSOpenPanel or NSSavePanel. This is quite trivial to do. First off, the “easy way” would be to add... [read more]
Apple, Cocoa, Coding
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Leopard: PhotoSearch demo app now live

PhotoSearch, a demo app I wrote for WWDC a few years ago, is now live: http://developer.apple.com/samplecode/PhotoSearch/ It demonstrates some cool custom cell stuff that is only available on Leopard.
Apple, Cocoa, Coding
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Instruments on Leopard: How to debug those random crashes in your Cocoa app

Update: Sept 9, 2009: Mac OS 10.6 Snow Leopard now has this feature built into Instruments! In Xcode, choose “Run -> Run with Performance Tool -> Zombies”, and repeat your steps that cause the crash.... [read more]
Apple, Cocoa, Coding
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New Leopard user features – Open and Save Panels

Leopard, the new Mac OS 10.5, is out! There are a lot of new features, but not everything is mentioned on the features page. Here are some of the cool “power user” features which you... [read more]
Apple, Cocoa, Coding
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NSBrowser, bindings, and a custom cell class

Hi Cocoa Programmers, There is a small bug in NSBrowser if you use bindings and want a custom cell class. Typically, you would do something like this in your awakeFromNib: - (void)awakeFromNib { [iBrowser setCellClass:[ImageTextBrowserCell... [read more]
Apple, Cocoa, General
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Xcode debugging tips

It might be nice to note a few Xcode debugging things that I tend to do. Frequently, I’ll want to break on a specific symbol, like -[NSException raise] Well, there are several ways to do... [read more]
Apple, Cocoa, General
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People! Use your keyboard (shortcuts) for menus.

Mac OS X has some GREAT keyboard access. One spectacular thing is the ability to access all items (unlike windows, where you have to have a defined shortcut for each item, and you easily run... [read more]
Apple, Cocoa, General
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Xcode tips and tricks — fast method finding

Inside of Xcode, I’ll want to quickly go to a method implementation. If you hit Cmd-F and do a find for the method name (or the start of it), you will frequently get hits for... [read more]
Apple, Cocoa, General
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NSOutlineView: reloadData and crashes in reloadData

A note to NSOutlineView Cocoa programmers: It has never been safe to call reloadData while an outlineView is doing a reloadData. What the heck does that mean? Well, if you call reloadData, a whole bunch... [read more]
Apple, Cocoa, General
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WWDC: Beyond Buttons and Sliders: Complex Controls in Cocoa

Come to WWDC this year! I’ll be giving a great talk on advanced control and cell creation with Cocoa: 120 Beyond Buttons and Sliders: Complex Controls in Cocoa Learn how you can quickly and efficiently... [read more]
Cocoa, General
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Cocoa: modal NSColorPanel dialog.

Hi all, I’ve seen some people request how to do a modal color panel. Well, carbon has GetColor(..) which ultimately uses the same NSColorPanel. So, you can set it to begin a modal session before... [read more]
Apple, Cocoa, General
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[NSColorPanel isContinuous] and [NSColorWell isContinuous]

A quick comment about these two properties: [NSColorPanel isContinuous] and [NSColorWell isContinuous]. Generally, you want these two things to be in sync. Whenever the color changes in the NSColorPanel, the color in the NSColorWell will... [read more]
Apple, Cocoa, General
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Xcode shortcuts to finding a file.

Cocoa Developers: While programming with Xcode, I’ve developed several habits to make me a faster programmer. I’ll share these tidbits with you. 1. Use Cmd-Shift-D to quickly open files that you know the names to.... [read more]
Apple, Cocoa, General
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Cocoa: NSArrayController and two tableview’s

Hi Cocoa Developers, Tip of the day: Don’t bind two NSTableView’s to a single NSArrayController instance. Bugs will happen! More specifically, attempting to multi-select rows will not work properly — the two tableviews will fight... [read more]
Apple, Cocoa, General
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Cocoa: Targeting the entire tableview in a drop operation

Hi Programmers. If you are doing drag and drop in an NSTableView with Cocoa, you can use the following method in your “validateDrop” datasource method to retarget the row it is going to: – (void)setDropRow:(int)row... [read more]
Apple, Cocoa, General

(c) 2008-2018 Corbin Dunn

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