搜索控制器在 Xcode 6.4 中不起作用

Question

I am learning Swift and tried to create a demo app using a TableViewController with a search bar. However, I am getting a EXC_BAD_INSTRUCTION error with console showing fatal error: unexpectedly found nil while unwrapping an Optional Value

The viewDidLoad() function is having the error

override func viewDidLoad()
{
    super.viewDidLoad()
    searchController.searchResultsUpdater = self
    searchController.dimsBackgroundDuringPresentation = false

    //Do more stuff

}

Answer 1

The problem is that searchController doesn't exist. Well, it exists as an instance variable , but you have not assigned that variable any value other than nil . You need to make an actual UISearchController and assign it to self.searchController .