【Swift】BlockからSelectorを作る メモ（要検証）

コード

SelectorExt.swift

extension Selector {

    init(_ target: AnyObject, _ methodName: String, _ block: @escaping (Void)-> Void) {
        self.init(methodName)

        let imp: IMP = imp_implementationWithBlock(unsafeBitCast(block as @convention(block) (Void)-> Void, to: AnyObject.self))

        class_addMethod(target.classForCoder, self, imp, "v@")
    }

}

使い方

ViewController.swift

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let button = UIButton(frame: CGRect(origin: .zero, size: CGSize(width: 50, height: 50)))
        button.backgroundColor = .yellow
        var cnt = 0
        let sel = Selector(button, "didTaped") {
            print("\(cnt) taped!!")
            cnt+=1
        }
        button.addTarget(self, action: sel, for: .touchUpInside)
        view.addSubview(button)
}

0 taped!!
1 taped!!
2 taped!!
3 taped!!
4 taped!!
5 taped!!
6 taped!!
7 taped!!
8 taped!!
9 taped!!

参考

BlockからSelector(メソッド)を作る