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