Reading Time: < 1 minute It looks like it. Obviously my observation could be quite limited. But here is the background, in the good old days, Apple ranks app mostly by the download number in a given amount of time, and the ratings/reviews. So basically the popular the app, the higher the rank. This process could reinforce itself. Apple realized

Reading Time: 2 minutes (Update 06-24-11) Last night I found “More iPhone 3 development” (by Dave mark and Jeff Lamarche) chapter 14 deveoted full chapter to multithread including timer. (Original) As of iOS 4, Apple made blocks and Grand Central Dispatch (GCD) available. Previously it was available on Mac. Some pre-requisite or recommend readings WWDC 2010 video session 206:

Reading Time: 2 minutes I got those questions from a reader: Why there is no national 529 plan? Looking at some states plan, it’s pretty much mutual funds like 401k, the investment return is like S&P? Why bother (consider S&P return is so low)? I am not expert on this, I think why each state has a plan is

Reading Time: 3 minutes (Update 05-10-2014) I saw the IPO of China based Cheetah Mobile in the news, not too impressed or confident of their apps though, although I know they make money. Cheetah was a subsidiary of Kingsoft (and King still has a big stake after IPO). I also noticed the WSJ article about China app market. I

Reading Time: < 1 minute Latest and the greatest 🙂 1) Fixed “data not being saved” bug in myNestEgg and collegeFund 2) Also, in myNestEgg v 1.5, we added “Auto Pilot” feature, similar to what has been introduced in collegeFund 1.5. The main difference is in myNestEgg I set income ratio to 70%. Why 70% for income ratio in retirement

Reading Time: 2 minutes I was working on a new app and this app has something to do with timing. Basically I need to record the time between a button being displayed and the time a user touches the button (note they are in two different functions). NSDate and memory leak To accomplish this, I am using NSDate class,

Reading Time: < 1 minute (Update 08-29-2014) As of iOS 7, this functionality needs some tweak. See this thread on stack overflow and this post. The gist of the change is Apple disabled http, it needs https now. (Original 05-14-2011) I was following John Muchow’s tutorial “Distribute Ad Hoc Applications over the air OTA“. It worked as expected until the

Reading Time: 2 minutes If you are iOS developer who has sold app (or ads, in-app purchase) on iTunes App store, the iTunes connect Financial Report is no stranger to you. Personally I published my 1st paid app to the App store last Sept, and I have since received financial report email notifications, and direct deposit. I did not

Reading Time: < 1 minute (Update 05-13-2011) Released. Free for a limited time. Here is a link to the iTunes App store. (Original) This is to address one problem posed by a user in the iTunes app store review. Basically his (her) comment is that the iteration approach (try and error to get desired coverage ratio) takes too much work.

Reading Time: 2 minutes Top 10 misconception or mysteries facing new iOS developers. Summarized from my observations and own experience. Part 1. Free app or paid app? This is a big question. Apple iTunes app store is not a freebie store (compared to many other app stores), that being said, most downloaded apps are either free or cost 99