ios - 将父类作为目标添加到 UIButton

Question

我有一个 UIButton likeButton，它将在 .TouchUpinside 上调用 likeBtnClicked

likeButton.addTarget(self.superview, action: "likeBtnClicked:", forControlEvents: UIControlEvents.TouchUpInside)

这工作正常，但有警告

"No method declared with Objective-C selector".

如果 likeButton 在一个类(例如 MyClass)中实现，那么我会将其替换为

likeButton.addTarget(Myclass, action: #selector(Myclass.likeBtnClicked), forControlEvents: UIControlEvents.TouchUpInside)

但是如何使其适用于多个想要使用“likeButton”而没有任何警告的类(viewControllers)？这个问题对于 UITapGestureRecognizer 也同样适用。

这里是示例代码:

import Foundation

class SubClass: UIView {

   var likeButton = UIButton(frame: CGRectMake(0,0,100,50))

   override init(frame: CGRect) {
       super.init(frame: frame)

       addSubview(likeButton)
       likeButton.addTarget(self.superview, action: "likeBtnClicked:", forControlEvents: UIControlEvents.TouchUpInside)
   }

   required init?(coder aDecoder: NSCoder) {
       fatalError("init(coder:) has not been implemented")
   }
}

class SuperClassA: UIView {

   let viewHavingBtn = SubClass(frame: CGRectMake(0,0,300,500))

   override init(frame: CGRect) {
       super.init(frame: frame)

       addSubview(viewHavingBtn)
   }

   func likeBtnClicked(sender: AAButton) {
       print(sender.tag)
   }

   required init?(coder aDecoder: NSCoder) {
       fatalError("init(coder:) has not been implemented")
   }
}

class SuperClassB: UIView {

   let viewHavingBtn = SubClass(frame: CGRectMake(0,0,300,500))

   override init(frame: CGRect) {
       super.init(frame: frame)

       addSubview(viewHavingBtn)
   }

   func likeBtnClicked(sender: AAButton) {
       print(sender.tag)
   }

   required init?(coder aDecoder: NSCoder) {
       fatalError("init(coder:) has not been implemented")
   }
}

Answer 1

请按照以下步骤操作:

1] 在父类(super class)中声明一个 UIButton 对象

2]初始化该按钮并在父类(super class)初始化方法中将目标添加到该按钮

3]在父类(super class)中定义触摸事件的操作方法

4]将该按钮添加为子类中的 subview 以显示按钮

5] 在要处理按钮触摸的子类中重写父类(super class)中的按钮操作方法实现。