When I tried to publish an app with Watch Kit App/Extension, I have the error:

ERROR ITMS-90203: “Invalid architecture: Apps that include an app extension and a framework must support arm64

We talked about adding and using custom font back in 2012.

This is another way now with Core Text framework.

It also helps to load encrypted fonts which could be required by some of the font license.

I posted about how to modularize storyboard using RBStoryboardLink and how to use SWRevealViewController.

But to use both of them together is not straight forward.

This is because both library makes use of custom segues to do what they want to do. And it is not possible for you to customize 1 segue to satisfy both!

SWRevealViewController is a very well written iOS library by John Lluch.

It is a UI component popularly known as the hamburger menu that slides in the sidebar.

This post is all about my encounter with SWRevealViewController.

Most of us have been typing on keyboard without knowing this hideous trick. Can’t be blamed for how keyboard is designed.

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"The straight quotes we know"
“The curly quotes”

The straight quotes is exactly the same for the left and right, while the curly quotes are not. The curly quotes looks like 66 and 99.

Golang reflect package is one of the hardest to understand.

Yet reflect is one of the most powerful because you can inspect a struct and it’s fields during runtime, and change it.

There will be times where you want to do these on the command line.

List the available SDKs

xcodebuild -showsdks

For example, I have iphonesimulator8.2 in my list of SDKs. This will be used in the next step.

I encountered a weird error when using UICollectionView, where the storyboard is using autolayout.

This is the error:

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Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x7fda6411de70 H:[UIButton:0x7fda6411dc90(13)]>",
    ...
    "<NSAutoresizingMaskLayoutConstraint:0x7fda61cf61e0 h=--& v=--& H:[UIView:0x7fda6411d500(50)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fda6411de70 H:[UIButton:0x7fda6411dc90(13)]>

I was once writing a simple piece of code, something along the line of:

NSString *name = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleDisplayName"];

It turns out strange that when I run in Release scheme, name is nil when I inspect the variable in debugger.

When I run in Debug scheme, it is fine. The code returns the app name as you expected.

Xcode kind of just want us to have ONE storyboard in a project.

But that is difficult for a team to work on because it is almost impossible to resolve any merge conflicts for storyboard (utterly complex XML).

There are 2 ways.