IOS WEB APP学习
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WEB APP混合学习，写得有点粗糙，有啥米问题QQ: 285979593
WEB使用HTML5通过WEBVIEW通信，JS调用OBJECT-C或者OBJECT-C调用JS来交互，配合SQLITE数据库来实现一个登陆的功能。
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSString *path = [[NSBundle mainBundle]pathForResource:@"login" ofType:@"" inDirectory:@"login"]; NSURL *url = [NSURL fileURLWithPath:path]; NSURLRequest *req = [NSURLRequest requestWithURL:url]; UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)]; [self.view addSubview: webView]; [webView loadRequest:req]; NSString *str = [NSString stringWithFormat:@"<!DOCTYPE html> <html lang='en'><head><meta http-equiv='Content-Type' content='text/html; charset=UTF-8'> <meta charset='utf-8'> <meta http-equiv='X-UA-Compatible' content='IE=edge'> <meta name='viewport' content='width=device-width, initial-scale=1'> <meta name='description' content=''> <meta name='author' content=''> <link rel='icon' href='favicon.ico'> <title>Login</title> <link href='login_resources/signin.css' rel='stylesheet'> <link href='bootstrap.min.css' rel='stylesheet'> </head> <body> <div class='container'> <div class='form-signin' role='form'> <span class='user_pic'> <img src='login_resources/home.png' height='120' width='120' alt='' name='user_face' id='user_face'> </span> <h2 class='form-signin-heading'>登陆</h2> <input type='username' id='username' class='form-control' placeholder='User name' required='' autofocus='' autocomplete='ON'> <input type='password' id='password' class='form-control' placeholder='Password' required=''> <button class='btn btn-lg btn-primary btn-block' onclick='login()'>Sign in</button> <label class='checkbox' ><input type='checkbox' id='session' value='remember-me'> 记住密码</label> </div> </div> <script type='text/javascript'> document.getElementById = (function(fn){ return function(){ return fn.apply(document,arguments); }; })(document.getElementById); function loginErr(){ alert('用户名或密码错误'); return; } function getUserName(){ return document.getElementById('username').value; } function getPassWord(){ return document.getElementById('password').value; } function loadSession(){ document.getElementById('username').value=localStorage.getItem('username'); document.getElementById('password').value=localStorage.getItem('password'); } function login(){ var username=getUserName(); var password=getPassWord(); if (username==''){ alert('用户名不能为空！'); return; } if (password==''){ alert('密码不能为空！'); return; } if (document.getElementById('session').checked){ localStorage.setItem('username', username); localStorage.setItem('password', password); } var appName = 'fuyun02'; var functionName = 'login'; var Parameters = {}; var jsonString = (JSON.stringify(Parameters)); var escapedJsonParameters = escape(jsonString); var url = appName + '://' + functionName + '#' + escapedJsonParameters; window.location.href = 'fuyun02://login/home'; } loadSession(); </script> </body></html>"]; [webView loadHTMLString:str baseURL:[NSURL fileURLWithPath:path]]; //[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]]; webView.delegate = self;//放在后面 [self openDB]; NSLog([NSURL fileURLWithPath:path].path);}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}//数据库操作//获取document目录并返回数据库目录- (NSString *)dataFilePath{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; //选用数组中的第一个文件路径 NSLog(@"=======%@",documentsDirectory); NSLog(@"home:%@",NSHomeDirectory()); //从资源复制到沙箱documents目录 NSFileManager *fileManager = [NSFileManager defaultManager]; NSError *error; NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"db"]; BOOL success = [fileManager fileExistsAtPath:writableDBPath]; if (!success){ NSString *dbPath = [[NSBundle mainBundle]pathForResource:@"db" ofType:@"" inDirectory:@"login"]; BOOL s = [fileManager copyItemAtPath:dbPath toPath:writableDBPath error:&error]; if (!s) { NSAssert1(0, @"Failed to create writable database file with message '%@'.",@"db" ); } } return [documentsDirectory stringByAppendingPathComponent:@"db"]; }//创建，打开数据库- (BOOL)openDB { //获取数据库路径 NSString *path = [self dataFilePath]; //文件管理器 NSFileManager *fileManager = [NSFileManager defaultManager]; //判断数据库是否存在 BOOL find = [fileManager fileExistsAtPath:path]; //如果数据库存在，则用sqlite3_open直接打开（不要担心，如果数据库不存在sqlite3_open会自动创建） if (find) { NSLog(@"Database file have already existed."); //打开数据库，这里的[path UTF8String]是将NSString转换为C字符串，因为SQLite3是采用可移植的C(而不是 //Objective-C)编写的，它不知道什么是NSString. if(sqlite3_open([path UTF8String], &db) != SQLITE_OK) { //如果打开数据库失败则关闭数据库 sqlite3_close(db); NSLog(@"open database file!"); return NO; }else{ NSLog(@"open sqlite db ok!"); return YES; } }else{ NSLog(@"not found file!"); } return NO;}//查找- (BOOL) query:(NSString *)sqlQuery user:(NSString *)username{ sqlite3_stmt * statement; if (sqlite3_prepare_v2(db, [sqlQuery UTF8String], -1, &statement, nil) == SQLITE_OK) { sqlite3_bind_text(statement, 1, [username UTF8String], -1, NULL); while (sqlite3_step(statement) == SQLITE_ROW) { char *login_name = (char*)sqlite3_column_text(statement, 1); NSString *nsNameStr = [[NSString alloc]initWithUTF8String:login_name]; //int age = sqlite3_column_int(statement, 2); char *user_name = (char*)sqlite3_column_text(statement, 2); NSString *nsUser_Name = [[NSString alloc]initWithUTF8String:user_name]; // NSLog(@"name:%@ age:%d address:%@",nsUser_Name,nsNameStr); // NSLog(@"login_name:%@ user_name:%@",nsUser_Name,nsNameStr); sqlite3_close(db); return YES; } //NSLog(sqlQuery); } return NO;}#pragma mark - UIWebViewDelegate- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { //获取当前URL NSString *currentURL = [webView stringByEvaluatingJavaScriptFromString:@"document.location.href"]; //获取标题 NSString *title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"]; //用户名 NSString *username= [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById('username').value"]; //密码 NSString *pwd= [webView stringByEvaluatingJavaScriptFromString:@"document.getElementById('password').value"]; /* if ([title isEqual:@"Login"]){ return YES; } if ([title isEqual:@""]){ return YES; }*/ NSString *requestString = [[request URL] absoluteString]; NSLog(requestString); //login NSRange range=[currentURL rangeOfString:@"login"]; if (range.location==NSNotFound) { NSLog(@"URL为空时的请求"); return YES; } NSRange homeRange=[currentURL rangeOfString:@"home"]; if (!homeRange.location==NSNotFound) { return YES; } if ([requestString hasSuffix:@"fuyun02://login/home"]) { NSString *path = [[NSBundle mainBundle]pathForResource:@"home" ofType:@"" inDirectory:@"login"]; //从资源加载 NSURL *url = [NSURL fileURLWithPath:path]; NSURLRequest *req = [NSURLRequest requestWithURL:url]; NSData *data = [[NSData alloc]initWithContentsOfFile:path]; [webView loadData:data MIMEType:nil textEncodingName:nil baseURL:url]; return YES; } NSString *lowerUserName=[username lowercaseString]; NSLog(lowerUserName); NSLog(pwd); BOOL ret= [self query:@"select * from fnd_user where login_name = ?" user:lowerUserName]; if (ret){ NSLog(@"用户与密码正确"); return YES; }else{ [webView stringByEvaluatingJavaScriptFromString:@"loginErr();"]; } return YES;}@end
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