ios - Swift 无法识别的选择器发送到实例分段控件

Question

我试图将选择器添加到我的 UISegmentedControl。

    segmentedControl = UISegmentedControl(items: items)
    segmentedControl.layer.cornerRadius = 12.0
    segmentedControl.layer.borderColor = UIColor.purpleLight.cgColor
    segmentedControl.layer.borderWidth = 1.0
    segmentedControl.layer.masksToBounds = true
    segmentedControl.backgroundColor = .white
    self.contentView.addSubview(segmentedControl)

    segmentedControl.addTarget(self, action: Selector(("changeColor:")), for:.valueChanged)

然后:

func changeColor(sender: UISegmentedControl) {
        switch sender.selectedSegmentIndex {
        case 1:
            segmentedControl.backgroundColor = UIColor.green
        case 2:
            segmentedControl.backgroundColor = UIColor.blue
        default:
            segmentedControl.backgroundColor = UIColor.purple
        }
    }

但是，当我点击它时，出现错误 - unrecognized selector sent to instance 0x7fcf5f049000

Answer 1

替换您的操作参数 - 选择器。自 Swift 3 以来，选择器语法已更改。

segmentedControl.addTarget(self, action: #selector(self.changeColor(sender:)), for:.valueChanged)