When I migrate my wordpress-es to VPS, Apache was the default setup.

Problem: I wanted to run some Node.js apps in the same VPS, but node requires nginx.

Hence, I configured my VPS to run both Apache and Nginx.

After migrating from a shared webhost to a dedicated VPS, the next step is to migrate all my wordpress sites to that 1 VPS instance.

This is basically setting up the wordpress scripts for each site, and writing the apache virtual host for each.

After many years of using a shared webhost, I finally decided to switch to VPS.

The shared webhost I have been using is HostGator, which has been good. But a VPS is even better, and so I switched to Digital Ocean, which cost only $5 a month (I was paying $10 to HostGator for just a shared webhost)!

The Wordpress I was migrating is blog.just2us.com (not this blog). As you might know, this blog is hosted on github using Octopress.

I always have a build error after pod install, because by default, CocoaPods will configure your pods to build for active architecture only (during debugging).

The solution is to change Pods project setting Build Active Architecture Only to NO for debug.

But it is tedious to change every time after you run pod install (as your change will get reverted back to YES).

As much as possible, I use storyboard with autolayout, and create constraints from there.

But when you are required to create controls dynamically, that is not possible.

You have to fall back to coding the controls and writing constraints in code. There are generally 2 ways to create constraints in code:

1. writing each constraint directly, or

2. writing Visual Language Format (VLF).

When you use [array copy] or [array mutableCopy], you expect to get a complete new copy of the array/dictionary.

However, it doesn’t work that way.

Doing so will only gives you a shallow copy. What you usually want is a deep copy – that is to copy every object nested within.

This is a follow-up post to the tutorial on using AFNetworking 1.0.

With the upgrade of AFNetworking to 2.0, the code for 1.0 becomes obsolete. It is not backward compatible at all. So here is the new guide.

Alcatraz is a must have if you want to make your Xcode even more powerful.

With Alcatraz, you can easily discover and install plugins such as Lin, XcodeColors, HOStringSense, and many others.

One-click install, restart Xcode, and you are ready to use.

Things changed in late 2013 with Apple latest ‘App Resurrection’ feature.

For example, if your target was 4.0, then you raised it to 5.0, users still using version 4.x would still be able to install. A prompt like this will be shown:

It happened when I was working on an old project that use nib, and I converted it to use autolayout.

Everything was fine, except when I tried to present a table view controller, it crashed.

internal error. Cannot find an outgoing row head for incoming head

This is an error which I could not find a proper solution. But here’s what I did.