使用字符串中的参数实现执行选择器

Question

我需要从字符串中实现一个执行选择器。选择器必须有一个通知值作为参数。

class ChapterViewController: UIViewController {

    var chapterClass:ChapterClass!

    func catchNotificationParagraphFinished(notification:Notification) {

        let name = "catchNotificationParagraphFinished_\(chapter.className!)"
        let selector = NSSelectorFromString(name)

        chapterClass.perform(selector, with: notification)   
    }
}

    class ChapterClass: NSObject {

        func catchNotificationParagraphFinished_Chapter2(notification:Notification) {}
    }

我想我做错了什么，因为我得到了这个错误：

[ISAMGAME.ChapterClass catchNotificationParagraphFinished_Chapter2]: unrecognized selector sent to instance 0x600000052c60

*Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ISAMGAME.ChapterClass catchNotificationParagraphFinished_Chapter2]: unrecognized selector sent to instance 0x600000052c60**

我也试过：

func catchNotificationParagraphFinished_Chapter2(_ notification:Notification) {}

并且还尝试使用：

let name = "catchNotificationParagraphFinished_\(chapter.className!):"
let selector = Selector((name))

我的方法基于以下原因：

Answer 1

我认为您必须在选择器字符串中包括参数名称和 class 名称，因此选择器字符串变为：

let name = "ChapterClass.catchNotificationParagraphFinished_\(chapter.className!)(notification:)"

Answer 2

我的方法没问题，但是不要忘记给常量加上String类型...

 let name:String = "catchNotificationParagraphFinished_\(chapter.className!):"

使用字符串中的参数实现执行选择器

Implement perform selector with parameter from a String

ios

swift

string

performselector