iOS开发----仿照qq登陆界面以及限制密码

由于我用到了storyboard，所以关于控件的的设置什么的可能不能在代码中展现，话不多说，直接贴上代码吧，相关的我都写在注释里面了

////  ViewController.swift//  PasswordControl////  Created by wyh on 2016/10/9.//  Copyright © 2016年 wyh. All rights reserved.//import UIKitclass ViewController: UIViewController {        @IBOutlet weak var userName: UITextField!        @IBOutlet weak var password: UITextField!        @IBOutlet weak var btnLogin: UIButton!        //正则表达式匹配正确的密码，没有特殊字符    func checkPassword(str:String) -> Bool {        do{            let pattern = "[A-Za-z0-9]+";            let regex:NSRegularExpression = try NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.caseInsensitive);            let matches = regex.matches(in: str, options: NSRegularExpression.MatchingOptions.reportProgress, range: NSMakeRange(0, str.characters.count))            return matches.count > 0;        }        catch{            return false;        }    }    //检查密码有没有相同字符    func checkPasswordHasNoSameCharacter(str:String) -> Bool {        //swift3 已经没有for(var i = 0 ; i < str.length;++i)这样的语法了        var i = 0;        for temp in str.characters{            i += 1;            let index = str.index(str.startIndex,offsetBy:i);            let s = str.substring(from:index);            if(s.contains(String(temp))){                return false            }        }        return true;    }    //检测字符串中不包含shift和dead    func checkPasswordHasNoString(str:String,word_1:String,word_2:String) -> Bool {        if((str.contains(word_1))||(str.contains(word_2))){            return false;        }        return true;    }    @IBAction func unableToLogin(_ sender: UIButton) {                //弹框对话控制器        let alertController = UIAlertController(title: "对不起", message: "本功能未实现", preferredStyle: UIAlertControllerStyle.alert)        //取消动作        let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.cancel, handler: {(UIAlertAction)->Void in            print("取消操作");        });        //确认动作        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil);        //添加动作        alertController.addAction(cancelAction);        alertController.addAction(okAction);        //在self上弹出一个视图        self.present(alertController, animated: true, completion:nil)    }        @IBAction func newComer(_ sender: UIButton) {        let alertController = UIAlertController(title: "对不起", message:"本功能未实现", preferredStyle: UIAlertControllerStyle.alert);        let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.cancel, handler: {(UIAlertAction)->Void in            print("取消操作");        });        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil);        alertController.addAction(cancelAction);        alertController.addAction(okAction);        self.present(alertController, animated: true, completion:nil);    }        @IBAction func btnLogin(_ sender: UIButton) {                let userNameString = userName.text?.trimmingCharacters(in: NSCharacterSet.whitespaces);        let passwordString = password.text?.trimmingCharacters(in: NSCharacterSet.whitespaces);        var flag = true;        //用户名密码不为空        if((userNameString != "")&&(passwordString != ""))        {            if((passwordString?.characters.count)! > 8){                flag = checkPassword(str: passwordString!);                flag = checkPasswordHasNoSameCharacter(str: passwordString!);                flag = checkPasswordHasNoString(str: passwordString!, word_1: "shift",word_2: "dead");            }            else{                flag = false;            }        }        else        {            flag = false;        }        if(flag)        {            //bundle表示路径，completion表示回调函数            let sb = UIStoryboard(name: "Main", bundle: nil);            let secondViewController = sb.instantiateViewController(withIdentifier: "second") as! SecondPageController;            self.present(secondViewController, animated: true, completion: nil);        }        else        {            let alertController = UIAlertController(title: "对不起", message:"您的输入有误", preferredStyle: UIAlertControllerStyle.alert);            let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil);            alertController.addAction(okAction);            self.present(alertController, animated: true, completion:nil)        }    }    override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.                userName.adjustsFontSizeToFitWidth=true  //当文字超出文本框宽度时，自动调整文字大小        userName.minimumFontSize=14  //最小可缩小的字号                //设置view的背景图片        self.view.backgroundColor = UIColor(patternImage: UIImage(named:"login.jpg")!)                //圆角按钮        btnLogin.layer.cornerRadius = 4.0;        btnLogin.layer.masksToBounds = true;        //圆形头像        let headImageView = UIImageView();        let headImage = UIImage(named:"wyh.jpg");        let headImageSize:CGFloat = 75.0;                //frame设置其位置和大小，而bounds只能设置其大小，其参数中的x、y不起作用即便是之前没有设定frame属性，控件最终的位置也不是bounds所设定的参数。bounds实现的是将UIImageView控件以原来的中心为中心进行缩放。        headImageView.bounds = CGRect(x:(self.view.bounds.size.width - headImageSize)/2,y:(self.view.bounds.size.width - headImageSize)/2-150,width:headImageSize,height:headImageSize);                headImageView.frame = CGRect(x:(self.view.bounds.size.width - headImageSize)/2,y:(self.view.bounds.size.width - headImageSize)/2-75,width:headImageSize,height:headImageSize)                //设置圆形的半径        headImageView.layer.cornerRadius = headImageView.bounds.height/2;        //设置遮罩，true代表显示在最上面，iOS中视图可以理解为一层一层的图层        headImageView.layer.masksToBounds = true;        //圆形边框的属性        headImageView.layer.borderColor = UIColor.gray.cgColor;        headImageView.layer.borderWidth = 3;                headImageView.image = headImage;        self.view.addSubview(headImageView);                    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

第二个界面

////  SecondPageController.swift//  PasswordControl////  Created by wyh on 2016/10/9.//  Copyright © 2016年 wyh. All rights reserved.//import UIKitclass SecondPageController: UIViewController {        @IBOutlet weak var btnReturnToFirstPage: UIButton!    @IBOutlet weak var btnConvert: UIButton!        @IBOutlet weak var convertText: UITextField!        @IBAction func returnToFirstPage(_ sender: UIButton) {        self.dismiss(animated: true, completion: nil)    }    @IBAction func convertText(_ sender: UIButton) {        let str = convertText.text?.trimmingCharacters(in: NSCharacterSet.whitespaces);        var result = "";        for temp in (str?.characters)!{            if(temp == ",")            {                let index = result.index(result.endIndex,offsetBy:-1);                let s = result.substring(from:index).uppercased();                let formerStr = result.substring(to:index);                result = formerStr + s + " ";            }            else if(temp == ";")            {                let index = result.index(result.endIndex,offsetBy:-1);                let s = result.substring(from:index).lowercased();                let formerStr = result.substring(to:index);                result = formerStr + s + " ";            }            else            {                result.append(temp);            }        }        convertText.text = result;    }    override func viewDidLoad() {        super.viewDidLoad()                btnReturnToFirstPage.layer.cornerRadius = 4.0;        btnReturnToFirstPage.layer.masksToBounds = true;        btnConvert.layer.cornerRadius = 4.0;        btnConvert.layer.masksToBounds = true;            }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }    }

下面附上我工程的源文件

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