我无法让我的委托(delegate)协议(protocol)工作。我使用这个堆栈溢出问题作为指南 dispatch event to parent ViewController in swift .我不知道自这篇文章以来 Swift 3 是否发生了变化，但我在 parentViewController 中的函数从未被调用过。这是我的设置。
//PROTOCOL
protocol PDPPropDetailsDelegate {
func buttonPressed(PropDetailsVC: propertyDetailsVC)
}
// subview Controller
class propertyDetailsVC: UIViewController {
var delegate: PDPPropDetailsDelegate?
@IBAction func emailButton(_ sender: AnyObject) {
self.delegate?.buttonPressed(PropDetailsVC: self)
}
}
按钮在 subview Controller 中被调用。
//父 View Controller
class ImageDetailsVC: UIViewController, PDPPropDetailsDelegate {
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "container"{
container = segue.destination as! ContainerViewController
}
}
@IBAction func segmentControlAct(_ sender: Any) {
switch segmentControllerView.selectedIndex {
case 0: print("case 1")
container!.segueIdentifierReceivedFromParent("first")
case 1: print("case 2")
container!.segueIdentifierReceivedFromParent("second")
PropertyDetailsVC.delegate = self // **WHERE I SET DELEGATE**
setUpPropertyDetailsUI(property: filterImages)
default: print("default")
}
}
func buttonPressed(PropDetailsVC: propertyDetailsVC) {
print("BUTTON PRESSED")
}
}
Button Pressed 永远不会被调用。我认为这与未正确设置委托(delegate)有关。不完全确定为什么会这样。我的 setUpPropertyDetailsUI(property: filterImages) 从那个 VC 中获取 Outlets 并设置它工作得很好。我做了一个断点，当我分段到 PropertyDetailsVC 时调用它。有什么意见或建议吗？
import UIKit
open class ContainerViewController: UIViewController {
//Manipulating container views
fileprivate weak var viewController : UIViewController!
//Keeping track of containerViews
fileprivate var containerViewObjects = Dictionary<String,UIViewController>()
/** Specifies which ever container view is on the front */
open var currentViewController : UIViewController{
get {
return self.viewController
}
}
fileprivate var segueIdentifier : String!
/*Identifier For First Container SubView*/
@IBInspectable internal var firstLinkedSubView : String!
override open func viewDidLoad() {
super.viewDidLoad()
}
open override func viewDidAppear(_ animated: Bool) {
if let identifier = firstLinkedSubView{
segueIdentifierReceivedFromParent(identifier)
}
}
override open func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func segueIdentifierReceivedFromParent(_ identifier: String){
self.segueIdentifier = identifier
self.performSegue(withIdentifier: self.segueIdentifier, sender: nil)
}
override open func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == segueIdentifier{
//Remove Container View
if viewController != nil{
viewController.view.removeFromSuperview()
viewController = nil
}
//Add to dictionary if isn't already there
if ((self.containerViewObjects[self.segueIdentifier] == nil)){
viewController = segue.destination
self.containerViewObjects[self.segueIdentifier] = viewController
}else{
for (key, value) in self.containerViewObjects{
if key == self.segueIdentifier{
viewController = value
}
}
}
self.addChildViewController(viewController)
viewController.view.frame = CGRect(x: 0,y: 0, width: self.view.frame.width,height: self.view.frame.height)
self.view.addSubview(viewController.view)
viewController.didMove(toParentViewController: self)
}
}
}
import UIKit
class EmptySegue: UIStoryboardSegue{
override func perform() {
}
/*
// 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.
}
*/
}
最佳答案
您似乎对应用程序的流程有些困惑。这是我针对其他人关于同一主题的问题所写的答案:
https://stackoverflow.com/a/45312362/3832646
您的协议(protocol)和 subview Controller 看起来不错，但此处的其余代码存在很多问题:
您的 prepare(for segue:_, sender:_) 通常是您为目标(子) View Controller 设置委托(delegate)的地方。
PropertyDetailsVC.delegate = self 不会做任何事情 - 您需要一个 View Controller 的实例来设置它的委托(delegate)。
看起来您正在使用某种容器全局变量，我不确定它的用途。
看看我发布的答案，再试一次。它在 Swift 3 中。
关于ios - 在处理容器 VC 时无法让我的委托(delegate)协议(protocol)工作？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45618277/