基于 Storyboard 多种方式的页面跳转、参数传递

原文

经过按钮关联跳转

选中 Button ，而后点击 action 右边拖拽到 第二个页面

选择 “Show”便可完成跳转关联。

定义页面间 segue Id，经过代码触发跳转

选中第一个页面，点击manual右边拖拽到第二个页面

选中 show便可关联两个页面

点击中间的关联点，修改 Segue Id

经过 Segue Id 跳转

@IBAction func onButtonClick(_ sender: Any) {
    self.performSegue(withIdentifier: "ToSecondView", sender: nil)
}

经过 Storyboard ID 跳转

设置第二个页面的 Storyboard ID

经过 Storyboard 的文件名称和页面的 ID获取到ViewController，经过pushViewController跳转。

@IBAction func onButtonClick(_ sender: Any) {
        let sb = UIStoryboard(name: "Moments", bundle:nil)
        let vc = sb.instantiateViewController(withIdentifier: "SecondView")
        self.navigationController?.pushViewController(vc, animated: true)
    }

传递参数

传输参数到第二个页面

class SecondViewController: UIViewController {
    var param:String = ""
    override func viewDidLoad() {
        super.viewDidLoad()
        print("param:\(param)")
    }
}

传输参数很是简单，只要覆盖 prepare 方法，在方法中设置参数便可。

class FirstViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if(segue.destination is SecondViewController){
            let vc = segue.destination as! SecondViewController
            vc.param = "Wiki"
        }
    }
}

运行结果：

param:Wiki

返回参数：第一种方式

class FirstViewController: UIViewController {
    var param:String = ""
    override func viewDidAppear(_ animated: Bool) {
        // 在这里处理返回值
        print("返回值：\(param)")
    }
    ...
}

class SecondViewController: UIViewController {
    ...
    @IBAction func onCloseClick(_ sender: Any) {
        let vc = self.navigationController?.viewControllers[(self.navigationController?.viewControllers.count)! - 2] as! FirstViewController
        vc.param = "收到啦"
        self.navigationController?.popViewController(animated: true)
    }
}

结果

返回值：收到啦

返回参数第二种方式：经过 NotificationCenter 返回值

定义监听器

override func viewDidLoad() {
    super.viewDidLoad()
    let notificationName = Notification.Name("UploadStatus")
    NotificationCenter.default.addObserver(self, selector: #selector(updateStatus), name: notificationName, object: nil)
}
@objc func updateStatus(notification: Notification){
    if(notification.object != nil){
        print("2上传状态：\(notification.object!)")
    }
    if(notification.userInfo != nil){
        print("2参数：\(notification.userInfo!)")
    }
}

发送通知

let notificationName = Notification.Name("UploadStatus")
NotificationCenter.default.post(name: notificationName, object: "上传失败")
NotificationCenter.default.post(name: notificationName, object: nil, userInfo: ["param1":"Wiki","param2":18])