简单登陆页面的创建(页面跳转.键盘回收.实现换行.清除textField中的文字)
分类：OC
在这里实现了以下几种功能:
1.点击按钮实现页面的跳转 2.点击空白处实现键盘回收 3.点击return实现换行 4.添加清除符号实现清除textField中的文字 5.点击登陆按钮,实现UIAlert功能,弹出信息 6.实现视图上下移动
效果图
以下是源代码,各处有注释:第一步: 在AppDelegate.m文件中 建立根视图// 创建一个登陆页面self.landVC =[[LandingViewController alloc] init];// 给window设置根视图_window.rootViewController =_landVC;[_landVC release];第二步:在根视图LandingViewController.m文件中建立登陆页面:()<UITextFieldDelegate,UIAlertViewDelegate>@property(nonatomic ,retain)PasswordViewController *passWordVC;@property(nonatomic, retain)UIAlertView *alertView;@property(nonatomic, retain)UIAlertView *succeedAlertView;-(void)dealloc{[_alertView release];[super dealloc];}-(void)loadView{// super调用父类[super loadView];NSLog(@”%s”, __FUNCTION__);}- (void)viewDidLoad {[super viewDidLoad];(int i =1; i<3; i++) {UITextField *textFieldi =[[UITextField alloc] initWithFrame:CGRectMake(150, 100+70*i, 150, 35)];textFieldi.delegate =self;textFieldi.layer.borderWidth =2;textFieldi.layer.cornerRadius =10;[self.view addSubview:textFieldi];textFieldi.clearButtonMode=UITextFieldViewModeAlways;textFieldi.tag =1010+i;[textFieldi release];}((UITextField *)[self.view viewWithTag:1012]).secureTextEntry =YES;// 两个labelfor (int i=1; i < 3 ; i++){UILabel *labeli =[[UILabel alloc] initWithFrame:CGRectMake(80, 100+70*i, 100, 35)];[self.view addSubview:labeli];labeli.tag =1000+i;[labeli release];}UILabel *tempLabel =[UIButton buttonWithType:UIButtonTypeSystem];tempLabel =(UILabel *)[self.view viewWithTag:1001];tempLabel.text =@”用户名”;UILabel *temp1Label =[UIButton buttonWithType:UIButtonTypeSystem];temp1Label =(UILabel *)[self.view viewWithTag:1002];temp1Label.text =@”密码”;// 创建三个buttonfor(int i =0; i<3 ;i++){UIButton *buttoni=[UIButton buttonWithType:UIButtonTypeSystem];buttoni.frame=CGRectMake(50+100*i, 320, 80, 30);[buttoni setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];[self.view addSubview:buttoni];buttoni.tag =1003+i;}viewWithTag:1003];[landButton setTitle:@”登陆” forState:UIControlStateNormal];[landButton addTarget:self action:@selector(landClick:) forControlEvents:UIControlEventTouchUpInside];viewWithTag:1004];[passWordButton setTitle:@”找回密码” forState:UIControlStateNormal];[passWordButton addTarget:self action:@selector(passWordclick:) forControlEvents:UIControlEventTouchUpInside];viewWithTag:1005];[registButton setTitle:@”注册” forState:UIControlStateNormal];[registButton addTarget:self action:@selector(registClick:) forControlEvents:UIControlEventTouchUpInside];// 显示密码按钮UIButton *showPassWordButton =[UIButton buttonWithType:UIButtonTypeCustom];showPassWordButton.frame =CGRectMake(110, 290, 20, 20);[self.view addSubview:showPassWordButton];showPassWordButton.tag =100;[showPassWordButton setBackgroundImage:[UIImage imageNamed:@”check.png”] forState:UIControlStateNormal];[showPassWordButton addTarget:self action:@selector(showPassWord:) forControlEvents:UIControlEventTouchUpInside];UILabel *showPassWord=[[UILabel alloc] initWithFrame:CGRectMake(150, 290, 80, 20)];showPassWord.text =@”显示密码”;[self.view addSubview:showPassWord];[showPassWord release];=[[UIAlertView alloc] initWithTitle:@”对不起” message:@”账号或密码输入错误” delegate:self cancelButtonTitle:@”重新输入” otherButtonTitles:@”找回密码”, nil];=1020;// self.alertView.delegate = self;[self.alertView release];self.succeedAlertView =[[UIAlertView alloc ] initWithTitle:@”登陆成功” message:nil delegate:self cancelButtonTitle:@”确认” otherButtonTitles:@”返回”, nil];=1021;// self.succeedAlertView.delegate = self;[self.succeedAlertView release];}-(void)showPassWord:(UIButton *)button{UIButton *but=(UIButton *)[self.view viewWithTag:100];if (but.selected==1) {[but setBackgroundImage:[UIImage imageNamed:@”check.png”] forState:UIControlStateNormal];}else{[but setBackgroundImage:[UIImage imageNamed:@”checked.png”] forState:UIControlStateNormal];}but.selected ^=1;((UITextField *)[self.view viewWithTag:1012]).secureTextEntry ^=1;}#pragma mark 点击空白处回收键盘-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{[(UITextField *)[self.view viewWithTag:1012] resignFirstResponder];[(UITextField *)[self.view viewWithTag:1011] resignFirstResponder];}-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{>/2) {-/2;=CGPointMake(, -height);}return YES;}-(BOOL)textFieldShouldEndEditing:(UITextField *)textField{>/2) {-/2;=CGPointMake(, -height);}return YES;}#pragma mark 点击找回密码按钮 实现跳页-(void)passWordclick:(UIButton *)button{//创建一个PassWordViewControllerPasswordViewController *passWordVC=[[PasswordViewController alloc] init];// 设置动画效果[passWordVC setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];// 进行跳转[self presentViewController:passWordVC animated:YES completion:^{}];[passWordVC release];}#pragma mark 点击注册按钮 实现跳页-(void)registClick:(UIButton *)button{// 创建一个RegistViewControllerRegistViewController *registVC=[[RegistViewController alloc] init];// 设置动画效果[registVC setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];// 进行跳转[self presentViewController:registVC animated:YES completion:^{}];[registVC release];}#pragma mark 点击登陆按钮判断是否正确-(void)landClick:(UIButton *)button{viewWithTag:1012]).text isEqualToString:@”123″]) {[self.succeedAlertView show];}else{[self.alertView show];}}#pragma mark 实现判断密码是否正确的通知- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{if (alertView.tag == 1020) {if(buttonIndex ==1){PasswordViewController *passWordVC=[[PasswordViewController alloc] init];// 设置动画效果[passWordVC setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];// 进行跳转[self presentViewController:passWordVC animated:YES completion:^{}];[passWordVC release];}}else if(alertView.tag ==1021){if (buttonIndex ==0) {messageViewController *messVC=[[messageViewController alloc] init];[messVC setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];[self presentViewController:messVC animated:YES completion:^{}];[messVC release];}}}第三步:建立注册视图控制器 创建方法- (void)viewDidLoad {[super viewDidLoad];(int i =0; i < 5; i++) {UILabel *labeli=[[UILabel alloc] initWithFrame:CGRectMake(80, 120+65*i, 100, 30)];[self.view addSubview:labeli];labeli.tag =1000+i;[labeli release];}UILabel *nameLabel=(UILabel *)[self.view viewWithTag:1000];nameLabel.text =@”用户名”;UILabel *passwordLabel =(UILabel *)[self.view viewWithTag:1001];passwordLabel.text =@”密码”;UILabel *rePasswordLabel =(UILabel *)[self.view viewWithTag:1002];rePasswordLabel.text =@”确认密码”;UILabel *phoneNumLabel =(UILabel *)[self.view viewWithTag:1003];phoneNumLabel.text =@”手机号”;UILabel *emailLabel =(UILabel *)[self.view viewWithTag:1004];emailLabel.text =@”邮箱”;// textfieldfor(int i =0;i<5; i++) {UITextField *textFieldi=[[UITextField alloc] initWithFrame:CGRectMake(180, 120+65*i, 130, 30)];textFieldi.layer.borderWidth=1;textFieldi.layer.cornerRadius=10;[self.view addSubview:textFieldi];textFieldi.delegate =self;textFieldi.clearButtonMode=UITextFieldViewModeAlways;textFieldi.tag =1010+i;[textFieldi release];}UITextField *nameTextField=(UITextField *)[self.view viewWithTag:1010];nameTextField.placeholder=@” 请输入用户名”;UITextField *passwordTextField=(UITextField *)[self.view viewWithTag:1011];passwordTextField.placeholder=@” 请输入密码”;UITextField *rePasswordTextField=(UITextField *)[self.view viewWithTag:1012];rePasswordTextField.placeholder=@” 再次输入密码”;UITextField *phoneNumTextField=(UITextField *)[self.view viewWithTag:1013];phoneNumTextField.placeholder=@” 请输入联系方式”;UITextField *emailTextField=(UITextField *)[self.view viewWithTag:1014];emailTextField.placeholder=@” 请输入邮箱”;// 注册按钮UIButton *registButton =[UIButton buttonWithType:UIButtonTypeSystem];registButton.frame=CGRectMake(120,430 , 60, 30);[registButton setTitle:@”注册” forState:UIControlStateNormal];[self.view addSubview:registButton];registButton.tag =2000;*cancelButton=[UIButton buttonWithType:UIButtonTypeSystem];cancelButton.frame =CGRectMake(200, 430, 60, 30);[cancelButton setTitle:@”取消” forState:UIControlStateNormal];[self.view addSubview:cancelButton];[cancelButton addTarget:self action:@selector(cancelClick:) forControlEvents:UIControlEventTouchUpInside];=[[UIAlertView alloc] init];self.alertView =[[UIAlertView alloc ] initWithTitle:@”恭喜” message:@”注册成功” delegate:self cancelButtonTitle:@”确认” otherButtonTitles:@”返回”, nil];[registButton addTarget:self action:@selector(registClick:) forControlEvents:UIControlEventTouchUpInside];}#pragma mark 点击空白处回收键盘-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{[self.view endEditing:YES];}
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