ios - 如何在 Swift 中显示带有 UICollectionView 的弹出 UIViewController？

Question

如果我从 Storyboard启动它，带有 UICollectionView 的 UIViewController 工作正常。但是，当我尝试像这样启动它时:

let imagePicker = imagePickerControllerViewController()
imagePicker.modalPresentationStyle = .OverCurrentContext
presentViewController(imagePicker, animated: true, completion: nil)

在线崩溃:

collectionView.dataSource = self

问题是，如何正确地显示 UIViewController(具有 UICollectionView)？

Answer 1

替换:

let imagePicker = imagePickerControllerViewController()

与:

let imagePicker = storyboard.instantiateViewControllerWithIdentifier("imagePicker") as! imagePickerControllerViewController