AppDelegate.swift代码如下：
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame:UIScreen.main.bounds)
self.window?.backgroundColor = #colorLiteral(red: 0.4745098054, green: 0.8392156959, blue: 0.9764705896, alpha: 1)
self.window?.makeKeyAndVisible()
//1.创建导航控制器的根视图
let rootVC = ViewController()
//2.创建导航视图控制器，并为他制定根视图控制器
let navigation = UINavigationController(rootViewController: rootVC)
//3.将导航视图控制器设置为window的根视图控制器
self.window?.rootViewController = navigation
return true
}
ViewController.swift代码如下：
import UIKit
//代理传值第四步:
class ViewController: UIViewController,SecondViewControllerDeleget {
var lable:UILabel!
var textField:UITextField!
override func viewDidLoad() {
super.viewDidLoad()
self.setupViews()
self.view.backgroundColor = #colorLiteral(red: 0.9098039269, green: 0.4784313738, blue: 0.6431372762, alpha: 1)
self.title = "首页"
}
func setupViews(){
self.lable = UILabel(frame: CGRect(x: 107, y: 150, width: 200, height: 40))
self.lable.backgroundColor = #colorLiteral(red: 0.9764705896, green: 0.850980401, blue: 0.5490196347, alpha: 1)
self.view.addSubview(lable)
self.textField = UITextField(frame: CGRect(x: 107, y: 220, width: 200, height: 40))
self.textField.backgroundColor = #colorLiteral(red: 0.721568644, green: 0.8862745166, blue: 0.5921568871, alpha: 1)
self.view.addSubview(textField)
let button = UIButton(frame: CGRect(x: 107, y: 280, width: 200, height: 40))
button.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
button.setTitle("跳转", for: .normal)
self.view.addSubview(button)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
}
//MARK:- button关联事件
func buttonAction(sender:UIButton) {
let secondVC = SecoundViewController()
//属性赋值第二步:
secondVC.content = self.textField.text
//闭包传值第二步:
secondVC.passValue = {
(text:String) in
//取出参数值，为前一个界面的控件赋值
self.lable.text = text
}
//代理传值第三步
secondVC.delegate = self
self.navigationController?.pushViewController(secondVC, animated: true)
}
//代理传值第五步
func sendValue(text: String) {
self.lable.text = text
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
SecoundViewController.swift代码如下：
/*
从前往后传值
属性传值一共分为三步:
1.定义一个要与传值数据类型相同的属性
2.给属性赋值
3.取出属性中的值
从后往前传值
闭包传值:
1.定义一个闭包属性
2.在前一个界面为闭包属性赋值
3.在pop回去之前调用闭包
代理传值
1.定义协议
2.定义代理属性
3.代理对象所在类遵循协议
4.代理对象所在类遵循协议
5.代理对象所在类实现协议中的方法
6.通知代理对象干活
*/
import UIKit
//代理传值第一步:
protocol SecondViewControllerDeleget {
func sendValue(text:String)
}
class SecoundViewController: UIViewController {
var lable:UILabel!
var textField:UITextField!
//属性传值第一步
var content:String!
//闭包传值第一步:
var passValue:((String)->())!
//代理传值第二步:
var delegate:SecondViewControllerDeleget!
override func viewDidLoad() {
super.viewDidLoad()
self.setupViews()
//属性传值第三步:
self.lable.text = self.content
self.view.backgroundColor = #colorLiteral(red: 0.4745098054, green: 0.8392156959, blue: 0.9764705896, alpha: 1)
}
func setupViews(){
self.lable = UILabel(frame: CGRect(x: 107, y: 150, width: 200, height: 40))
self.lable.backgroundColor = #colorLiteral(red: 0.9764705896, green: 0.850980401, blue: 0.5490196347, alpha: 1)
self.view.addSubview(lable)
self.textField = UITextField(frame: CGRect(x: 107, y: 220, width: 200, height: 40))
self.textField.backgroundColor = #colorLiteral(red: 0.721568644, green: 0.8862745166, blue: 0.5921568871, alpha: 1)
self.view.addSubview(textField)
let button = UIButton(frame: CGRect(x: 107, y: 280, width: 200, height: 40))
button.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
button.setTitle("返回", for: .normal)
self.view.addSubview(button)
button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
}
//MARK:- button关联事件
func buttonAction(sender:UIButton) {
//闭包传值第三步:
// self.passValue(self.textField.text!)
//代理传值第六步
self.delegate.sendValue(text: self.textField.text!)
self.navigationController?.popViewController(animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
