swift（四）

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今天用swift写了个tableView,用闭包实现了反向传值。。。感觉现在语法掌握多了。。可以写点东西了。

class ViewController: UIViewController,UITableViewDataSource,UITableViewDelegate{

let cellIdentify = "cell1"

var mainTableView =UITableView()

var dataArray = [Int]()

overridefunc viewDidLoad() {

super.viewDidLoad()

self.mainTableView =UITableView(frame: CGRectMake(0,0, UIScreen.mainScreen().bounds.size.width,UIScreen.mainScreen().bounds.size.height), style: UITableViewStyle.Plain)

mainTableView.delegate =self

mainTableView.dataSource =self

mainTableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: cellIdentify)

self.view.addSubview(mainTableView)

dataArray.append(10)

// Do any additional setup after loading the view, typically from a nib.

}

func tableView(tableView:UITableView, numberOfRowsInSection section:Int) -> Int {

returndataArray.count

}

func tableView(tableView:UITableView, cellForRowAtIndexPath indexPath:NSIndexPath) -> UITableViewCell {

let cell1 = tableView.dequeueReusableCellWithIdentifier(cellIdentify, forIndexPath: indexPath)

cell1.textLabel?.text ="\(indexPath.row)"

return cell1

}

func tableView(tableView:UITableView, didSelectRowAtIndexPath indexPath:NSIndexPath) {

let twoViewController1 =twoViewController()

self .presentViewController(twoViewController1, animated:true) { () ->Void in

}

//闭包最全定义

var str = {

(str1:String,str2:String) ->Stringin

return str1+str2

}("a","b")

//省略闭包返回值但是要显示生命变量类型

var string:String = {

str1,str2 in

return str1+str2

}("c","D")

overridefunc didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

下面这两个使用闭包反向传值

class twoViewController: UIViewController {

var titleLabel:UILabel?

func oneClosure(str1:String) ->Void {

self.titleLabel?.text = str1

}

overridefunc viewDidLoad() {

self.view.backgroundColor =UIColor.redColor()

let nextButton =UIButton(type: UIButtonType.System)

nextButton.setTitle("下一页", forState:UIControlState.Normal)

nextButton.frame =CGRectMake(100,100, 100,40)

nextButton.addTarget(self, action:"nextStep", forControlEvents:UIControlEvents.TouchUpInside)

nextButton.backgroundColor =UIColor.whiteColor()

self.view .addSubview(nextButton)

self.titleLabel =UILabel(frame: CGRectMake(100,200, 100,40))

self.titleLabel?.text ="现在是第一页"

self.titleLabel?.backgroundColor =UIColor.greenColor()

self.view.addSubview(self.titleLabel!)

}

func nextStep() {

let threeView =ThreeViewController()

threeView.closure =oneClosure

// threeView.sendValue(oneClosure)

self.presentViewController(threeView, animated:true) { () -> Voidin

}

//typealias 重命名

//泛型无法重命名（要保证泛型的确定）

//class person<T> {}

typealias Cloure = String->()

class ThreeViewController:UIViewController {

overridefunc viewDidLoad() {

self.view.backgroundColor =UIColor.yellowColor()

}

var closure:Cloure?

func sendValue(Clo:Cloure) {

closure = Clo

}

overridefunc touchesBegan(touches: Set<UITouch>, withEvent event:UIEvent?) {

self.closure!("诶~变了")

self.dismissViewControllerAnimated(true) { () ->Void in

}

// var closure:Cloure?

// func sendValue(clo: Cloure) {

// self.closure = clo

// }

// override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

// self.dismissViewControllerAnimated( true) { () -> Void in

// }

// override func viewWillDisappear(animated: Bool) {

// self.closure?(10)

// }

// deinit {

// print("内存释放")

// }

// typealias workId = String

// typealias worker = person<workId>

//要保证泛型的确定性才可以重命名这个泛型

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