领域结果 <T> 计数返回零

Question

I'm populating my table view with Realm 'Patient' objects. To get how many rows/sections my tableview should have, i run :

class PatientsTableViewController: RealmSearchViewController {

var dataSource : Results<Patient>!
var currentPatient : Patient!
...

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {

        return dataSource.count
}

I have this function to set dataSource and i call it in viewDidLoad

func reloadTable()
{
    do
    {
        let realm = try Realm()
        dataSource = realm.objects(Patient)
        tableView?.reloadData()
    }
    catch
    {

    }
}

I use the currentPatient in another function. However, when i run the app, it crashes and gives me an error of

fatal error: unexpectedly found nil while unwrapping an Optional value

and points at

return dataSource.count

I tried replacing it with return dataSource!.count , or creating an object in the viewDidLoad (just for testing, i don't want to have any objects that i create) but the error was still there, and i also tried to reset content and settings in the Simulator, but to no good. What should i do ?

Answer 1

我通过在“初始视图控制器”中定义和初始化mainDataSource并将其通过prepareForSegue函数传递到应用程序曾经崩溃的下一个视图控制器的dataSource来进行mainDataSource 。