Swift中的7种界面传值方式总结(属性传值,构造器传值,通知传值,单例传值,协议传值,闭包传值,NSUserDefaults传值)

之前,我整理过OC的5种基本界面传值方式,很多朋友都有很喜欢,今天再整理一下Swift中的7种常用界面传值供大家参考,不到之处，欢迎各位提点,更多的希望能对大家有所帮助.

注: 文中 ,第一个界面为ViewController,第二个界面为DetailViewController两个界面都会分别有一个Button和一个TextFiled 用于输入值和接受值.来查看传值效果

两个界面的简单搭建及跳转操作如下

//第一个界面ViewController
import UIKit
class ViewController: UIViewController {
fileprivate var tf:UITextField = UITextField()
  override func viewDidLoad() {
    super.viewDidLoad()

    setUpUI()

  }
 //点击进入第二个界面的按钮进行跳转操作
 @objc fileprivate func btnAction()  {
    let vc = DetailViewController()
    navigationController?.pushViewController(vc, animated: true)
  }

  }

//设置界面
extension ViewController{
 fileprivate func setUpUI() {
    let btn = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
    btn.center = self.view.center
    btn.backgroundColor = UIColor.cyan
    btn.addTarget(self, action: #selector(btnAction), for: .touchUpInside)
    btn.setTitle("进第二个界面", for: UIControlState.normal)
    self.view .addSubview(btn)
    tf = UITextField(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
    tf.center = self.view.center
    tf.frame.origin.y = 200
    tf.backgroundColor = UIColor.blue
    self.view.addSubview(tf)
  }

}


 //第二个界面DetailViewController

import UIKit

class DetailViewController: UIViewController {
    var tf:UITextField!

override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.white
    setUpUI()
}

//点击按钮返回上一界面
func btnAction()  {
 navigationController?.popViewController(animated: true)

}


extension DetailViewController{

fileprivate func setUpUI() {
  
    let btn = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
    btn.center = self.view.center
    btn.backgroundColor = UIColor.cyan
    btn.addTarget(self, action: #selector(btnAction), for: .touchUpInside)
    btn.setTitle("返回第一个界面", for: UIControlState.normal)
    self.view .addSubview(btn)
    tf = UITextField(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
    tf.center = self.view.center
    tf.frame.origin.y = 200
    tf.text = tfStr
    tf.backgroundColor = UIColor.blue
    self.view.addSubview(tf)
}
}