ios - addTarget 到 UIButton 以编程方式给我 'unrecognized selector sent to class'

Question

我正在尝试学习如何创建按钮目标操作，但是，当我按下按钮时，出现了 LLDB 错误，并且我被告知这是“无法识别的选择器发送到类”。

我哪里错了？

StatusCell.swift:

let phoneIcon: UIButton = {
        let iv = UIImageView()

        iv.translatesAutoresizingMaskIntoConstraints = false
        iv.image = UIImage(named: "Phone3")?.imageWithRenderingMode(.AlwaysTemplate)

        let phoneBtn = UIButton(type: .Custom)

        phoneBtn.addTarget(CallButton.self, action: #selector(CallButton.buttonPressed(_:)), forControlEvents: .TouchDown)
        phoneBtn.addTarget(CallButton.self, action: #selector(CallButton.buttonReleased(_:)), forControlEvents: .TouchUpInside)

        phoneBtn.translatesAutoresizingMaskIntoConstraints = false
        phoneBtn.setImage(iv.image!, forState: .Normal)
        phoneBtn.tintColor = UIColor(r: 224, g: 224, b: 224)

        return phoneBtn

    }()

这是我调用 buttonPressed 和 buttonReleased 的 CallButton 类。

class CallButton: UIControl {

    func buttonPressed(sender: AnyObject?) {
        print("Pressed")
    }
    func buttonReleased(sender: AnyObject?) {
        print("Let go")
    }

}

Answer 1

参数 target 的值必须是 CallButton 的实例，而不是类型本身。