Question

I am working on trying to make a splitview based application. I am trying to use Apple’s MultipleDetailView example code

http://developer.apple.com/library/ios/#samplecode/MultipleDetailViews/Introduction/Intro.html

I have never really used example code like this (I usually just atart from scratch). All i did was copy the code into the correct classes of my app, but when I try to run it on the simulator the app doesn’t open.

I feel like I am maybe forgetting something obvious, since I didn’t code it myself.

Thanks!

Answer 1

The usual debugging technique applies. Put a breakpoint somewhere early in the program — the first line of main() for instance, and debug from there. Do you hit the breakpoint? If yes, move forward through the code until you find the line that causes the problem. If no, try to back up even further if you can, and also look for any clues as to what’s going wrong. If the app is running at all, there should be some sort of error message in the console output.

“…the app doesn’t open” doesn’t tell us nearly enough to help you. Something like “the app delegate is instantiated, but it’s window and splitViewController properties are nil” goes much further toward getting to the root of the problem.