转换到另一个ViewController时获取黑屏

Question

我正在尝试转移到另一个ViewController，但它给了我黑屏！有我的代码：

                            if (content == nil) {
                            let sec: testViewController = testViewController(nibName: nil, bundle: nil)
                            self.present(sec, animated: true, completion: nil)
                        }

在故事板中

：

Answer 1

从主故事板中将Storyboard ID提供给testViewController。

if content == nil {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let sec: testViewController = storyboard.instantiateViewController(withIdentifier: "testViewController") as! testViewController
    self.present(sec, animated: true, completion: nil)
    }

Answer 2

在Storborad中提供故事板ID ex - ＆gt; testViewControllerId并检查UseStoryboard Id

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let testController = storyboard.instantiateViewController(withIdentifier :"testViewControllerId") as! testViewController
self.present(testController, animated: true)

Answer 3

您只想尝试其他方式以编程方式显示目标ViewController。试试这个，

let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) 
let myViewController: UIViewController = storyBoard.instantiateViewControllerWithIdentifier("<myViewControllerRestorationID>") //if you have the restoration ID, otherwise use 'ModalViewController'
self.presentViewController(myViewController, animated: true, completion: nil)