Swift - 推入 ViewController 会出现黑屏

Question

所以我有一个包含 tableView 的视图控制器。每当单击 tableview 单元格时，就会推入另一个视图控制器。这个新的视图控制器有自己的 xib。文件和快速文件。我在新的视图控制器中有一个地图视图，但新的视图控制器在推入时是黑色的。我该如何解决这个问题？ TableView didSelectRowAtIndexPath 方法：

 func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    var cell = tableView.cellForRowAtIndexPath(indexPath) as BusinessTableViewCell
    var business = self.results[indexPath.row]
    var mapView = BusinessMapViewController()
    mapView.business = business
    mapView.mapView = MKMapView()
    self.navigationController?.pushViewController(mapView, animated: true)
    println("\(business.name) SELECTED")
}

新视图控制器：

import UIKit
import MapKit
class BusinessMapViewController: UIViewController {

@IBOutlet weak var mapView: MKMapView!
var business:Business!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    let location = CLLocationCoordinate2D(
        latitude: 37.774929,
        longitude: -122.419416
    )
    let span = MKCoordinateSpanMake(0.1, 0.1)
    let region = MKCoordinateRegion(center: location, span: span)
    println(business.latitude)
    mapView.setRegion(region, animated: true)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

}

Answer 1

如果您的新 ViewController 有自己的 swift 文件，那么您可以在 didSelectRowAtIndexPath 方法中尝试这样的操作：

let mapView = self.storyboard?.instantiateViewControllerWithIdentifier("MapViewController") as BusinessMapViewController

之后，您可以使用以下命令推送到 nextViewController：

self.navigationController?.pushViewController(mapView, animated: true)

但不要忘记添加 StoryBoard ID，否则会崩溃。

您的代码将是：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var cell = tableView.cellForRowAtIndexPath(indexPath) as BusinessTableViewCell
var business = self.results[indexPath.row]
let mapView = self.storyboard?.instantiateViewControllerWithIdentifier("MapViewController") as BusinessMapViewController
mapView.business = business
mapView.mapView = MKMapView()
self.navigationController?.pushViewController(mapView, animated: true)
println("\(business.name) SELECTED")
}

也许这会对你有所帮助。