如何在 Swift 中显示带有 UICollectionView 的弹出式 UIViewController

Question

如果我从情节提要启动UICollectionView的UIView控制器，它可以正常工作。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)

它在线崩溃：

collectionView.dataSource = self

问题是，如何正确显示UIViewController(具有UICollectionView(？

Answer 1

替换 ：

let imagePicker = imagePickerControllerViewController()

跟：

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