如何向子视图属性 Swift 添加操作？ [复制]

Posted 2023-02-24

【中文标题】如何向子视图属性 Swift 添加操作？ [复制]

【英文标题】：How to add action to a subviews Attributes Swift? [duplicate]

【发布时间】：2016-01-16 14:16:30

【问题描述】：

我对 Swift 比较陌生，我想为我的自定义 UIView 按钮添加一系列操作

这是代码，但是当我按下按钮时，我会收到此错误。

请告诉我建模的最佳实践。

class CameraView: UIView 

    var cameraButton : UIButton?

    convenience init() 
        self.init(frame: CGRectZero)
        self.backgroundColor = UIColor.clearColor()

        cameraButton = UIButton()

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

    override init(frame: CGRect) 
        super.init(frame: frame)
    


    func setButton(button : UIButton)
        self.cameraButton = button
    


    func setUpMyView()
        self.cameraButton = UIButton()
        self.cameraButton?.layer.cornerRadius = 30
        self.cameraButton?.layer.borderWidth = 5
        self.cameraButton?.backgroundColor = UIColor.clearColor()
        self.cameraButton?.layer.borderColor = UIColor.whiteColor().CGColor

        self.addSubview(cameraButton!)
    




ViewController.swift


import UIKit

class ViewController: UIViewController 

    var cameraView : CameraView?

    override func viewDidLoad() 
        super.viewDidLoad()

        cameraView = CameraView()

        cameraView?.cameraButton?.addTarget(self, action: "pressed", forControlEvents: .TouchUpInside)

        self.view = cameraView

    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    


    func pressed(sender : AnyObject!)
        print("Button Pressed")
        let alert = UIAlertController(title: "Alert", message: "Another Alert", preferredStyle: .Alert)
        let action = UIAlertAction(title: "Ok", style: .Default, handler: nil)
        alert.addAction(action)

        self.presentViewController(alert, animated: true , completion: nil)
    

错误

2016-01-16 14:00:42.023 TPProject[4194:1442964]-[TPProject.ViewController 按下]：无法识别的选择器发送到实例 0x125655a30 2016-01-16 14:00:42.028 TPProject[4194:1442964] *** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[TPProject.ViewController 已按下]：无法识别的选择器发送到实例 0x125655a30” *** 首先抛出调用堆栈： （0x183d39900 0x1833a7f80 0x183d4061c 0x183d3d5b8 0x183c4168c 0x188a63e50 0x188a63dcc 0x188a4ba88 0x188a636e4 0x188a63314 0x188a5be30 0x188a2c4cc 0x188a2a794 0x183cf0efc 0x183cf0990 0x183cee690 0x183c1d680 0x18512c088 0x188a94d90 0x1000adf64 0x1837be8b8） libc++abi.dylib：以 NSException 类型的未捕获异常终止

【参考方案1】：

我想出了解决办法。我必须添加一个 : 以采取行动

从这条线

cameraView?.cameraButton?.addTarget(self, action: "pressed", forControlEvents: .TouchUpInside)

到

cameraView?.cameraButton?.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)

【讨论】：

附带说明，没有必要为此子类化 UIView - 看看这里developer.apple.com/library/ios/documentation/UIKit/Reference/…。您没有覆盖任何 UIView 或 UIButton 的方法，因此您只需在 ViewController 中创建一个 UIButton 并在 ViewDidLoad() 或 LoadView() 中配置它。如果您要重用按钮的外观，您可以在 UIButtonExtension.swift 文件中为 UIButton 创建一个新方法 - 更多信息请点击此处developer.apple.com/library/ios/documentation/Swift/Conceptual/…。