Swift 3：在通配符中TapGestureRecognizer中的代理不被调用 [英] Swift 3 : Delegate within TapGestureRecognizer in Generics doesn't get called

问题描述

  public protocol SubmitAgeDelegate：class {
 func changeSubmitButtonBool（）
} 
  

问题是我想在泛型类中调用它。

 打开类GenericController< UICollectionViewCell，UICollectionReusableView> {
 
 weak var submitAgeDelegate：SubmitAgeDelegate？ 
  

在UITapGestureRecognizer内

  func tapGestureDidRecognize（_ gesture：UITapGestureRecognizer）{
 
如果让myAgeDelegate = self.submitAgeDelegate {
 print（inside delegate）//从不进入
 myAgeDelegate.changeSubmitButtonBool（）
} 
 
} 
  

不太确定为什么它永远不会被叫？类似的方式在IBAction函数的常规类中也起作用。

在我的另一个类中：

 打开类MyCell：ActionCell， SubmitAgeDelegate {
 weak var submitAgeDelegate：SubmitAgeDelegate？ 
 
 public override init（frame：CGRect）{
 super.init（frame：frame）
 submitAgeDelegate = self 
 initialize（）
} 
 
 //委托
 public func changeSubmitButtonBool（）{
 
 print（called）
} 
  / pre> 
 
解决方案
你永远不会设置 submitAgeDelegate  c $ c> GenericController 。在您的 MyCell 类中具有相同名称的成员没有帮助。 
 
 
 
为了设置其委托，您需要获得对 GenericController 的引用;没有办法。 （这与泛型没有任何关系;对于非泛型类，它是一样的）。由于它看起来像您使用它作为 UICollectionViewCell ，您可能使用您在 tableView中创建的引用：cellForRowAtIndexPath：或类似的。
 
I have a protocol like so :
public  protocol SubmitAgeDelegate : class  {
func changeSubmitButtonBool()
}
The problem is I want to call it in a generics class.
open class GenericController<UICollectionViewCell,UICollectionReusableView> {

weak var submitAgeDelegate: SubmitAgeDelegate? 
Within a UITapGestureRecognizer 
func tapGestureDidRecognize(_ gesture: UITapGestureRecognizer) {

    if let myAgeDelegate = self.submitAgeDelegate {
        print("inside delegate")   //Never gets inside
        myAgeDelegate.changeSubmitButtonBool() 
    }

}
Not too sure why it never gets called? Similar ways have worked in regular classes withing IBAction functions. 

In my other class :
open class MyCell: ActionCell, SubmitAgeDelegate {
weak var submitAgeDelegate: SubmitAgeDelegate?    

public override init(frame: CGRect) {
    super.init(frame: frame)
    submitAgeDelegate  = self
    initialize()
}

// Delegate 
public func changeSubmitButtonBool(){

    print("called ")
}

解决方案
You are never setting the submitAgeDelegate of the GenericController. Having a member of the same name in your MyCell class doesn't help. 

You need to get a reference to your GenericController in order to set its delegate; there's no way around that. (This doesn't have anything to do with generics; it's the same for non-generic classes.) Since it looks like you're using it as a UICollectionViewCell, you might use the reference that you make in tableView:cellForRowAtIndexPath: or similar.

                        
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