I was developing an application based on navigation controllers and tableviews. After working for two days, I experienced abnormal behaviour in xcode. For debugging errors, I used 'NSLog()' and alert view. But it was not executed while debugging. Some codes which i changed was not shown in the execution. Then it got worse, even it didn't recognize break points inside the code. Even I closed the application and restarted it. Still it was giving the same problem. Then I deleted the build folder. And then it became normal. Why this happened? Whats the reason behind it?
As a general strategy, when I see weirdness like that during development, I do a 'clean all' (equivalent to deleting the build directory) and rebuild. It's not a guaranteed fix, but sometimes it helps.