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Have a file incorporated in the “Supporting files” in Xcode called: taxrates.csv.
NSString *fileString = [NSString stringWithContentsOfFile:@"taxrates.csv" encoding:NSUTF8StringEncoding error:NULL];
NSLog(@"%@",fileString); // <-- just displays null
This is because the current directory of the application is not the path of the application, instead it is the path of the containing UUID folder.
To fix, try using
[[NSBundle mainBundle] pathForResource:@"taxrates" ofType:@"csv"]to get the path of the file instead of using a raw string.