《Swift 的界面之间的传值，详细介绍3种传值方式》正向传值、协议传值、闭包
1、 控制器界面间的正向传值
/*
《Swift 的界面之间的传值，详细介绍3种传值方式》
正向传值、协议传值、闭包
*/
随着移动的开发，界面之间的传值，也频繁出现，更关键的是在面试的时候也时常被提起。提起最多的是 Block 同时还有协议 （在Swift中是叫 闭包）。我们要详细介绍它。
// Created by 周双建 on 15/12/7.
// Copyright © 2015年 周双建. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
let Screen = CGSizeMake(
200,40)
override func viewDidLoad() {
super.viewDidLoad()
// 我们首先，进行正面解说
//我们先给我们的本控制器设置一个标题 (必须实现导航控制器否者不显示)
self.title = "第一个控制器"
self.view.backgroundColor = UIColor.whiteColor()
// 设置一个点击按钮，驱动事件跳转到下一个控制器
let Btn = UIButton(type: UIButtonType.Custom) as UIButton
Btn.frame = CGRectMake(20, 100,Screen.width,Screen.height)
Btn.setTitle("跳转到第二个控制器",forState: UIControlState.Normal)
Btn.setTitleColor(UIColor.magentaColor(),forState: UIControlState.Normal)
Btn.addTarget(self,action: "BtnClick",forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(Btn)
// Do any additional setup after loading the view,typically from a nib.
}
/*****************************************************************/
// 按钮点击后，事件的触发
func BtnClick(){
let TVC = TwoViewController()
//传入一个字符串，给第二个控制器
TVC.TSTR = "第二个控制器"
//在传入一个颜色对象
TVC.TColoer = UIColor.blueColor()
//实现界面的跳转
self.navigationController?.pushViewController(TVC,animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
第二个控制器的内容是：
//
// TwoViewController.swift
// Swift_009
//
import UIKit
class TwoViewController: UIViewController {
//首先，我们要创建两个对象，来接受上一个界面传来的值
var TSTR :String? // 创建一个字符串对象
var TColoer :UIColor? //创建一个UIColoer 的颜色对象
override func viewDidLoad() {
super.viewDidLoad()
//设置控制器的标题
self.title = self.TSTR
// 设置背景颜色
self.view.backgroundColor = self.TColoer
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
// Dispose of any resources that can be recreated.
}
}
2、 协议的反向传值
// FViewController.swift
//
import UIKit
/*
注意了：如果不实现，你的定义的协议方法，会一直报错 。如下：Type 'FViewController' does not conform to protocol 'FTvCdelegte'
*/
class FViewController: UIViewController,FTVCdelegte{
override func viewDidLoad() {
super.viewDidLoad()
//我们要创建一个返回按钮
let Fbtn = UIButton(type: UIButtonType.Custom) as UIButton
Fbtn.frame = CGRectMake(30,self.view.frame.size.width-60,40)
Fbtn.setTitle("跳转到第二个界面",forState: UIControlState.Normal)
Fbtn.addTarget(self,action: "Click",forControlEvents: UIControlEvents.TouchUpInside)
Fbtn.setTitleColor(UIColor.redColor(),forState: UIControlState.Normal)
self.view.addSubview(Fbtn)
// Do any additional setup after loading the view.
}
/****************************************************************/
//跳转触发事件
func Click(){
let Tvc = FtwoViewController()
Tvc.delegate_zsj = self
self.navigationController?.pushViewController(Tvc,animated: true)
}
override func didReceiveMemoryWarning() {
// Dispose of any resources that can be recreated.
}
//实现协议的方法
//更改主题名字
func change(title: String) {
self.title = title
}
//更改背景色
func ChangeColoer(Coloer: UIColor) {
self.view.backgroundColor = Coloer
}
//是否成功
func ChangSucces(YON: Bool) {
print(YON)
}
/*
// MARK: - Navigation
// In a storyboard-based application,you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
// FtwoViewController.swift
//
import UIKit
//要创建一个协议
protocol FTVCdelegte : NSObjectProtocol{
//在协议里面，声明许多方法
// 第一个，改变标题
func change(title:String)
//第二个，改变背景色
func ChangeColoer (Coloer:UIColor)
//是否成功的标志
func ChangSucces(YON:Bool)
}
class FtwoViewController: UIViewController {
// 创建一个准守协议的对象
var delegate_zsj :FTVCdelegte?
override func viewDidLoad() {
super.viewDidLoad()
返回上一个界面",forState: UIControlState.Normal)
self.view.addSubview(Fbtn)
/************************************************************/
//返回，事件的触发
func Click(){
delegate_zsj?.change("首页")
delegate_zsj?.ChangeColoer(UIColor.redColor())
delegate_zsj?.ChangSucces(true)
self.navigationController?.popToRootViewControllerAnimated(true)
}
override func didReceiveMemoryWarning() {
// Dispose of any resources that can be recreated.
}
/*
*/
}
// BBViewController.swift
//
import UIKit
class BBViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//创建一个按钮
let btn = UIButton(type: UIButtonType.Custom) as UIButton
btn.frame = CGRectMake(30,40)
btn.setTitle("UIControlState.Normal)
btn.setTitleColor(UIColor.magentaColor(),forState: UIControlState.Normal)
btn.addTarget(self,forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(btn)
// Do any additional setup after loading the view.
}
func Click(){
let BBTC = BBTViewController()
BBTC.bbchange = { (title:String,coloer:UIColor) in
self.title = title
self.view.backgroundColor = coloer
}
self.navigationController?.pushViewController(BBTC,0)"> */
}
// BBTViewController.swift
//
import UIKit
class BBTViewController: UIViewController {
//定义一个闭包，带有两个参数
var bbchange :((title:String,coloer:UIColor)->Void)?
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.greenColor()
//创建一个按钮
返回到第1个控制器",action: "bClick",forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(btn)
// Do any additional setup after loading the view.
}
func bClick(){
bbchange?(title:"成龙",coloer:UIColor.redColor())
self.navigationController?.popToRootViewControllerAnimated(true)
}
override func didReceiveMemoryWarning() {
*/
}
原文链接：https://www.f2er.com/swift/325195.html