带有后退按钮的快速呈现 Controller 返回上一个屏幕

Question

我正在展示一个 UICollectionViewController，但它最终只是一个没有后退按钮的 Controller ，无法返回到最后一个 Controller 或主 Controller ，我该如何添加后退按钮？或者我还有什么其他选择？

class UserProfileController: UICollectionViewController, UICollectionViewDelegateFlowLayout, UserProfileHeaderDelegate, ProfileHeaderClosedDelegate {


func presentFRC() {
       let PE = FriendsRequestsController(collectionViewLayout: 
 UICollectionViewFlowLayout())
    let NPE = UINavigationController(rootViewController: PE)

    self.present(NPE, animated: true, completion: nil)
}
}

Answer 1

在您呈现的 View Controller 的 View 中添加以下代码。

override func viewDidLoad() {
super.viewDidLoad()
var backbutton = UIButton(type: .Custom)
backbutton.setImage(UIImage(named: "BackButton.png"), forState: .Normal)
backbutton.setTitle("Back", forState: .Normal)
backbutton.setTitleColor(backbutton.tintColor, forState: .Normal) // You can change the TitleColor
backbutton.addTarget(self, action: "backAction", forControlEvents: .TouchUpInside)

self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: backbutton)
}

func backAction() -> Void {        
self.navigationController?.popViewControllerAnimated(true)   
}