iOS LoginDemo 

  1 //
  2 //  ViewController.m
  3 //  FicowLoginDemo1
  4 //
  5 //  Created by Ficow on 15/11/12.
  6 //  Copyright © 2015年 Ficow. All rights reserved.
  7 //
  8 
  9 #import "ViewController.h"
 10 
 11 @interface ViewController ()
 12 @property (strong, nonatomic) IBOutlet UITextField *account;
 13 @property (strong, nonatomic) IBOutlet UITextField *password;
 14 @property (strong, nonatomic) IBOutlet UIButton *login;
 15 @property (strong, nonatomic) IBOutlet UIImageView *loginBackground;
 16 @end
 17 
 18 @implementation ViewController
 19 
 20 - (void)viewDidLoad {
 21     [super viewDidLoad];
 22     // Do any additional setup after loading the view, typically from a nib.
 23     
 24     //Notification监听代码
 25     [[NSNotificationCenter defaultCenter] addObserver:self
 26                                              selector:@selector(textFieldDidChange)//监听实现的方法
 27                                                  name:@"emptyInput"
 28                                                object:nil];
 29     NSLog(@"Initiated");
 30 }
 31 
 32 //实现点击背景隐藏键盘
 33 - (IBAction)backgroundTap:(id)sender{
 34     //将View的class设为UIControl
 35     NSLog(@"ViewTapped");
 36     [[NSNotificationCenter defaultCenter] postNotificationName:@"emptyInput" object:self];
 37     [self.account resignFirstResponder];
 38     [self.password resignFirstResponder];
 39 }
 40 
 41 //设置键盘的return key为next并跳转到下一个输入框，不要忘了设置return key属性
 42 - (IBAction)nextInput:(id)sender{
 43     NSLog(@"AccountInputFinished");
 44     [[NSNotificationCenter defaultCenter] postNotificationName:@"emptyInput" object:self];
 45     [self.account resignFirstResponder];
 46     [self.password becomeFirstResponder];
 47 }
 48 
 49 //输入结束，跳转到按钮，并点击按钮
 50 - (IBAction)textFieldDoneEditing:(id)sender{
 51     [[NSNotificationCenter defaultCenter] postNotificationName:@"emptyInput" object:self];
 52     [sender resignFirstResponder];
 53 //    [self.login sendActionsForControlEvents:UIControlEventTouchUpInside];
 54     NSLog(@"PasswordInputFinished");
 55 }
 56 
 57 - (void)textFieldDidChange
 58 {
 59     NSLog(@"Notification is valid");
 60     if (self.account.text.length == 0 || self.password.text.length == 0) {
 61             self.login.userInteractionEnabled = NO;
 62             self.login.alpha = 0.5;
 63             self.loginBackground.alpha = 0.2;
 64     }
 65     else{
 66         self.login.userInteractionEnabled = YES;
 67         self.login.alpha = 1.0;
 68         self.loginBackground.alpha = 1.0;
 69     }
 70 }
 71 
 72 //错误警告弹出框
 73 - (void) errorAlert:(id) sender
 74                    :(NSString *) msg
 75                    :(NSString *) title{
 76     
 77     UIAlertController *controller = [UIAlertController alertControllerWithTitle:title/*警告框的标题*/ message:msg preferredStyle:UIAlertControllerStyleAlert];
 78     UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"确定" /*警告框的确定键*/style:UIAlertActionStyleCancel handler:nil];
 79     [controller addAction:cancelAction];
 80     [self presentViewController:controller animated:YES completion:nil];
 81 }
 82 
 83 
 84 - (IBAction)checkInput:(id)sender{//定义警告视图
 85     
 86     NSString *msg = nil;
 87     NSString *title = nil;
 88     if([self.account.text isEqualToString:@"admin"] &&[self.password.text isEqualToString:@"1234"]){
 89         msg = [NSString stringWithFormat:@"登录成功！"];
 90         title = [NSString stringWithFormat:@"Welcome"];
 91     }//demo1进行账号密码判空的部分
 92     else{
 93         if([self.password.text length] == 0 || [self.account.text length] == 0){
 94             msg = [NSString stringWithFormat:@"账号/密码不能为空！"];
 95         }
 96         else{
 97             msg = [NSString stringWithFormat:@"账号/密码错误！"];
 98         }
 99         title = [NSString stringWithFormat:@"Error"];
100     }
101     
102     [self errorAlert:sender
103                      :msg
104                      :title];
105 }
106 
107 
108 
109 
110 - (void)didReceiveMemoryWarning {
111     [super didReceiveMemoryWarning];
112     // Dispose of any resources that can be recreated.
113 }
114 
115 @end

 

可以学习一下使用ReactiveCocoa库来做LoginDemo，很好用哦！

posted @ 2015-11-20 17:28  Ficow  阅读(439)  评论(0)  编辑  收藏  举报