Swift开发-代理

在iOS开发中经常会用到代理,Swift开发中的代理这样写:

1、首先定义一个协议

// swift中如何定义协议: 必须遵守NSObjectProtocolprotocol VisitorViewDelegate : NSObjectProtocol{    // 登录回调    func loginBtnWillClick()    // 注册回调    func regiserBtnWillClick()}

2、方法实现

func loginBtnClick(){        delegate?.loginBtnWillClick()    }    func regiserBtnClick(){        delegate?.regiserBtnWillClick()    }

3、方法调用

private func setupVisitorView(){        // 1、初始化未登录界面        let customView = VisitorView()        customView.delegate = self        view = customView        visitorView = customView        // 2、设置导航条未登录按钮//        navigationController?.navigationBar.tintColor = UIColor.orangeColor()        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "注册", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(regiserBtnWillClick))        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "登录", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(loginBtnWillClick))    }    func loginBtnWillClick() {        print(#function)    }    func regiserBtnWillClick() {        print(#function)    }