This week I'm gonna throw three strategies you can use to improve the performance of your NSPredicates — either in Core Data or while filtering a collection like NSArray.
If things are really slow though, there are probably other places where you should be focusing, but let's assume you have already...
For this week I want to share a concept and an example repository of something called Cellular Automata.
To be honest, it's one of those simple things with a big name. Let me explain:
Imagine a grid of cells. Each cell has a finite number of states (let's say 0 or 1 at its most basic case).
The syst...
If you debug solely through NSLog you are missing the better insight the debugger can provide you. Also, it is easy to forget all those logging functions, ship them into production and, depending on the industry, even introduce security risks.
On the other hand, if you are using only basic breakpoin...
在使用Xcode5进行iOS7开发时，在打开SDK文件后，可能会不小心对其中的代码进行了一些操作，那么在下一次 Build 或者 Run 的时候就会出现类似以下的错误:
After modifying system headers, please delete the module cache at '/Users/one/Library/Developer/Xcode/DerivedData/ModuleCache/24CDWDK5BTYJE'
解决方法:
删除错误中提到的 ~/Library/Developer/Xcode/DerivedData/ModuleCach...
