import UIKit
protocol MyButtonProtocol {
    func buttonPressed(sender: UIButton)
}

但是,当我尝试将addTarget添加到具有该协议的UIButton时,我收到此错误：无法将“MyButtonProtocol”类型的值转换为期望的参数类型“AnyObject？”.不应该有任何东西可以转换为AnyObject ??这是我的主要代码：

import UIKit
class MyView: UIView {
    var delegate: MyButtonProtocol
    var button: UIButton
    init(delegate: MyButtonProtocol) {
        self.delegate = delegate
        button = UIButton()
        //... formatting ...
        super.init(frame: CGRect())
        button.addTarget(delegate,action: "buttonPressed:",forControlEvents: .TouchUpInside)
        addSubview(button)
        //... more formatting ...
    }
}

提前致谢.