Question

I’m trying to figure out the SQLite functionality for the iPhone, and I’m having some problems reading my database file from an overridden UITableViewDataSource function. I am storing the database file location in an ivar (as an NSString) in my application delegate, however when I try to access that string from an overridden UITableViewDataSource function, it returns some other object. If I access the string from any of the classes own instance methods, it works fine.

Is there any way to access the application delegate from within overridden UITableViewDataSource functions?

Answer 1

The problem turned out to be really simple. I had created the NSString to hold the path to my database file using stringByAppendingPathComponent: . I failed to realize that this was going to be autoreleased, and so I didn’t bother to explicitly retain it. That reason it was returning a different type of object was because that memory had been reused once the string had been autoreleased.

Explicitly retaining the string holding the path to the database file solved the problem.