Swift 常量、变量定义使用 String和简单控件的使用

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// ViewController.swift

// MySwiftLearn

// Created by xdw on 15/5/14.

import UIKit

let UI_SCREEN_WIDTH = UIScreen.mainScreen().bounds.size.width

let UI_SCREEN_HEIGHT = UIScreen.mainScreen().bounds.size.height

class ViewController: UIViewController,UITextFieldDelegate,UITableViewDelegate,UITableViewDataSource

{

overridefunc viewDidLoad() {

super.viewDidLoad()

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

//常量、变量

let dw :Int =3

var dw1 =5

println("---------\(dw)----\(dw1)---")

let 字符串 :String ="notString"

var 字符串1 = "isString"

字符串1 =字符串 + 字符串1

println("------\(字符串1),-----------\(字符串) ")

if 字符串.isEmpty

{

println("空字符串")

}

else

{

println("不是空字符串")

}

//----第一种方法用OC的截取方法，需要将String类型转化为NSString类型

//字符串1=(字符串1 as NSString).substringFromIndex(2)

//字符串1=(字符串1 as NSString).substringWithRange(NSMakeRange(2, 6))

//----第二种方法直接用String的方法,传入的参数为index结构体

let index =advance(字符串1.startIndex,2)

字符串1 =字符串1.substringFromIndex(index)

println("截取后字符串-\((字符串as NSString).length),-----------\(字符串) ")

if字符串.hasSuffix("not"){

println("字符串有not后缀")

}

else{

println("字符串没有not后缀")

}

if字符串.hasPrefix("not"){

println("字符串有not前缀")

}

else{

println("字符串没有not前缀")

}

for temp in 字符串 {

println(temp)

}

//控件

self.creatLab(是否变颜色:true)//不能用0，1表示真假

self.creatBtn()

self.creatTextField()

self.creatTableView()

}

func creatLab(是否变颜色 changeColor:Bool){

let lab:UILabel =UILabel()

lab.frame =CGRectMake(0 ,20,UI_SCREEN_WIDTH,30)

lab.textAlignment =NSTextAlignment.Center

lab.textColor =UIColor.redColor()

self.view.addSubview(lab)

var textStr ="lab变颜色"

if changeColor

{

var attrStr:NSMutableAttributedString =NSMutableAttributedString(string: textStr)

var attributesFont :UIFont = UIFont.systemFontOfSize(26)

var attributesColor :UIColor = UIColor.blueColor()

attrStr.addAttribute(NSFontAttributeName,value: attributesFont,range:NSMakeRange(0,3))

attrStr.addAttribute(NSForegroundColorAttributeName, value: attributesColor, range:NSMakeRange(0,3))

lab.attributedText = attrStr

}

else

{

lab.text = textStr

}

func creatBtn(){

var btn:UIButton =UIButton.buttonWithType(UIButtonType.Custom)as! UIButton

btn.frame =CGRectMake(0,60, UI_SCREEN_WIDTH,30)

btn.setTitle("btn", forState:UIControlState.Normal)

btn.setTitle("按钮", forState: .Selected)

btn.setTitleColor(UIColor.redColor(), forState:UIControlState.Normal)

btn.addTarget(self, action:"btnClick:", forControlEvents:UIControlEvents.TouchUpInside)

self.view.addSubview(btn)

}

func btnClick(sender:AnyObject)

{

var btn :UIButton = senderas! UIButton

btn.selected = !btn.selected

self.view.endEditing(true)

}

func creatTextField()

{

var textField:UITextField =UITextField(frame: CGRectMake(0,100, UI_SCREEN_WIDTH,30))

textField.placeholder ="默认"

textField.delegate =self;

self.view.addSubview(textField)

}

func textFieldDidBeginEditing(textField:UITextField) {

println("开始编辑")

}

func textFieldDidEndEditing(textField:UITextField) {

println("结束编辑")

}

func creatTableView(){

var myTabView:UITableView =UITableView(frame: CGRectMake(0,140, UI_SCREEN_WIDTH,UI_SCREEN_HEIGHT - 140), style:UITableViewStyle.Plain)

myTabView.delegate =self

myTabView.dataSource=self

myTabView.registerClass(UITableViewCell.self, forCellReuseIdentifier:"cell")

self.view.addSubview(myTabView)

}

func numberOfSectionsInTableView(tableView:UITableView) -> Int {

return1

}

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

return10

}

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

let cell = tableView .dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell

var row=indexPath.rowas Int

cell.textLabel!.text="第\(indexPath.row)行"

return cell;

}

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

println("第\(indexPath.row)行被点击")

}

overridefunc didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

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