当点击这些片段之一以触发操作时出现错误。
知道我在做什么错吗?
错误:
由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'-[TestingSubclassing.MySegmentControl segmentActionWithSender:]:无法识别的选择器已发送到实例0x7f9217907750'
import UIKit
class MySegmentControl: UISegmentedControl {
var actionName:Selector
init(actionName: Selector) {
self.actionName = actionName
super.init(frame: .zero)
insertSegment(withTitle: "Two", at: 0, animated: false)
insertSegment(withTitle: "One", at: 1, 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: self.actionName, for: .valueChanged)
self.translatesAutoresizingMaskIntoConstraints = false
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
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")
}
}
我也尝试过如下更改选择器。
let segment1 = MySegmentControl(actionName: #selector(segmentAction(sender:)))
和let segment1 = MySegmentControl(actionName: "segmentAction")
您必须是新手!您应该删除self.addTarget(self, action: self.actionName, for: .valueChanged)
中的class MySegmentControl
,在功能viewDidLoad()
下添加以下内容:
segmentOne.addTarget(self, action: #selector(segmentAction(sender:)), for: .valueChanged)