iOS开发----仿照qq登陆界面以及限制密码

//
//  ViewController.swift
//  PasswordControl
//
//  Created by wyh on 2016/10/9.
//  Copyright © 2016年 wyh. All rights reserved.
//

import UIKit

class 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.
}

}

//
//  SecondPageController.swift
//  PasswordControl
//
//  Created by wyh on 2016/10/9.
//  Copyright © 2016年 wyh. All rights reserved.
//

import UIKit

class 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.
}

}