界面通信界面通信

//控制器1

importUIKit
//页面传值1:从前往后传
//页面传值2:（1）闭包传值
//（2）代理传值
classViewController:UIViewController{
letstr ="helloWorld"
overridefuncviewDidLoad() {
super.viewDidLoad()
navigationItem.title="控制器1"
//self写在哪个实例方法里面表示该实例，写在类方法里面表示该类
letrightBtn =UIBarButtonItem(title:"跳转", style: .Plain, target:self, action:"pushToSecond")
navigationItem.rightBarButtonItem= rightBtn
}
//右按钮的响应方法：跳转到第二个页面
func pushToSecond(){
let secondVC=SecondViewController()
secondVC.delegate=self
//属性传值
secondVC.oneStr=str
//实现闭包
secondVC.closure= {
(str:String)->Int
in
print("viewcontroller-value =https://www.it610.com/(str)")
return str.lengthOfBytesUsingEncoding(4)
}
navigationController?.pushViewController(secondVC, animated:true)
}
overridefuncdidReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
extensionViewController:secondProtocol{
func translateString(str:String) {
print("协议传值\(str)")
}
}

APPDelegate
@UIApplicationMain

classAppDelegate:UIResponder,UIApplicationDelegate{
//可选类型不能直接参与运算。要运算的话必须进行强制解包
【界面通信】varwindow:UIWindow?
funcapplication(application:UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject:AnyObject]?) ->Bool{
letVC =ViewController()
//创建导航视图控制器
letnavc =UINavigationController(rootViewController: VC)
window=UIWindow(frame:UIScreen.mainScreen().bounds)
window?.backgroundColor=UIColor.whiteColor()
//设置window根视图控制器
window?.rootViewController= navc
window?.makeKeyAndVisible()
returntrue
}

//控制器2
importUIKit

//定义协议
protocol secondProtocol{
func translateString(str:String)
}
class SecondViewController:UIViewController{
//定义一个接收从第一个页面传过来的字符串
var oneStr:String?
//声明一个传值闭包(给传过来的参数进行拼接)
var closure:((str:String)->Int)?
//声明代理
var delegate:secondProtocol?
override func viewDidLoad() {
super.viewDidLoad()
print(oneStr)
navigationItem.title="控制器2"
view.backgroundColor=UIColor.cyanColor()
//定义左边按钮
let leftBtn =UIBarButtonItem(title:"back", style: .Plain, target:self, action:"backAction")
navigationItem.leftBarButtonItem= leftBtn
}
//
func backAction(){
closure!(str:"第二个页面")
delegate?.translateString("secondVC")
navigationController?.popViewControllerAnimated(true)
}
overridefuncdidReceiveMemoryWarning() {
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 prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}

界面通信

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