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在实例化UISegementedControl的子类时为类使用未实现的初始值设定项“init(frame:)”

uisegmentedcontrol swift ios

fs_tigre · 技术社区 · 5 年前

当我试图使用 MySegmentControl 在下面的代码中。错误发生在应用程序启动后。

知道我遗漏了什么吗?

致命错误:对类“TestingSubclassing.MySegmentControl”使用未实现的初始值设定项“init(frame:)”

UISegementedControl的子类

导入UIKit

class MySegmentControl: UISegmentedControl {

    init(actionName: Selector) {
        let discountItems = ["One" , "Two"]
        super.init(items: discountItems)

        self.selectedSegmentIndex = 0

        self.layer.cornerRadius = 5.0
        self.backgroundColor = UIColor.red
        self.layer.borderWidth = 1
        self.layer.borderColor = UIColor.blue.cgColor

        self.addTarget(self, action: actionName, for: .valueChanged)
    }

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

视图控制器

import UIKit

class ViewController: UIViewController {

    let segmentOne: MySegmentControl = {
        let segment1 = MySegmentControl(actionName:  #selector(segmentAction))
        return segment1
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(segmentOne)
    }

    @objc func segmentAction (sender: UISegmentedControl) {
        print("segmentAction")
    }
}

1 回复 | 直到 5 年前

vadian 5 年前

你可以打电话 super.init(frame 并插入段手动

class MySegmentControl: UISegmentedControl {

    init(actionName: Selector) {
        super.init(frame: .zero)

        insertSegment(withTitle: "Two", at: 0, animated: false)
        insertSegment(withTitle: "One", at: 0, animated: false)
        self.selectedSegmentIndex = 0

        self.layer.cornerRadius = 5.0
        self.backgroundColor = UIColor.red
        self.layer.borderWidth = 1
        self.layer.borderColor = UIColor.blue.cgColor

        self.addTarget(self, action: actionName, for: .valueChanged)
    }

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