ここでこのコードに問題があります
Book *theNewBook = [self parseTheBookXML];
// The book is not nil here
NSLog(@"The book's title: %@, number of pages:%@ and author: %@",theNewBook.title, theNewBook.pages, theNewBook.author);
[_theBooksArray addObject:theNewBook];
// TEST
Book *testBook = [_theBooksArray objectAtIndex:0];
// The book is nil here
NSLog(@"The book's title: %@, number of pages:%@ and author: %@",testBook.title, testBook.pages, testBook.author);
ここの壁にぶつかったので、私の本のオブジェクトが「nil」である理由を誰かに教えてもらえますか...