[英]Use of unimplemented initializer 'init(frame:)' for class when instantiating a subclass of UISegementedControl
當我嘗試在下面的代碼中使用MySegmentControl
的實例時,出現以下錯誤。 該錯誤在應用程序啟動后立即發生。
知道我錯過了什么嗎?
致命錯誤:對類“TestingSubclassing.MySegmentControl”使用未實現的初始值設定項“init(frame:)”
導入 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")
}
}
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")
}
}
您可以調用super.init(frame
並手動插入段。
並且您必須將target
參數添加到自定義init(actionName
方法。
class MySegmentControl: UISegmentedControl {
init(actionName: Selector, target: Any?) {
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(target, action: actionName, for: .valueChanged)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
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