swift基础学习传值[属性传值、代理、block代码块、等]

概述传值:在此之前我们先定义两个视图控制器ViewController ViewController01 1.属性传值正向、这里以字符串做例子、其他类型类似:ViewController->>>ViewController01 ViewController: let vc = ViewController01() vc.str ="hello" self.navigationController?.p

传值:在此之前我们先定义两个视图控制器VIEwController VIEwController01

1.属性传值正向、这里以字符串做例子、其他类型类似:VIEwController->>>VIEwController01

VIEwController:

let vc = VIEwController01()

vc.str ="hello"

self.navigationController?.pushVIEwController(vc,animated:true)

VIEwController01:

class VIEwController01: UIVIEwController {

var str =Nsstring()

overrIDefunc vIEwDIDLoad() {

super.vIEwDIDLoad()

self.vIEw.backgroundcolor =UIcolor.white

print(self.str)

}

overrIDefunc dIDReceiveMemoryWarning() {

super.dIDReceiveMemoryWarning()

// dispose of any resources that can be recreated.

}

}

2.代码块反向传值

VIEwController:

func click() {

let vc =VIEwController01()

vc.callBlock{(value: String?) ->VoID in

print(value)

}

self.navigationController?.pushVIEwController(vc,animated:true)

}

VIEwController01:

首先定义代码块类型:typealias textBlock = (String)->()

然后定义代码块属性:var block:textBlock?

实现代码块

func callBlock(block:textBlock?) {

self.block = block

}

func click() {

if let block = self.block {

block("li01")

}

self.navigationController?.popToRootVIEwController(animated:true)

}

3.delegate反向传值(协议)

VIEwController:首先要继承VIEwController01中的协议giveFirstStrDelegate

func click() {

let vc =VIEwController01()

vc.delegate = self

self.navigationController?.pushVIEwController(vc,animated:true)

}

代理方法

func giveStr(controller: VIEwController01,string: String) {

print(string)

}

VIEwController01:

首先定义个协议

protocol giveFirstStrDelegate:NSObjectProtocol {

func giveStr(controller:VIEwController01,string:String)

}

var delegate:giveFirstStrDelegate?

这些类似与OC中的代理实现

func click() {

if((delegate) !=nil){

delegate?.giveStr(controller:self,string:"hi I am li")

}

self.navigationController?.popToRootVIEwController(animated:true)

}

4.通知中心传值参考OC

5.单列传值也同样参考OC

基本是写过OC的swift都可以很容易上手

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