iOS+PHP注册登录系统 iOS部分（下）

接着上篇《iOS+PHP注册登录系统 PHP部分（上）》进行学习

3.iOS部分

上一次我们写完了数据库部分和PHP部分这次我们来完成iOS部分。
首先先在storyboard中一阵狂拖，弄成如下图。
可以先在text Field中输入用户名和密码 方便以后调试。

3.1登录部分代码

创建一个新的UIViewController 名为registViewController（用于注册用户，ViewController用于登录）。
在ViewController.h中importregistViewController
#import "registViewController.h"

然后设置登录界面中的控件 用来写用户名的控件名设置为txtUser,密码的控件名设置为txtPwd,确定按钮的方法名称为
LoginClick,注册按钮的方法名为registButton。
然后开始写ViewController.m中的代码

//
// ViewController.m
// iosLogin
//
// Created by 曹晗 on 16/2/25.
// Copyright :emoji: 2016年 CaoHan. All rights reserved.
// 

#import "ViewController.h" 

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *txtUser;
@property (weak, nonatomic) IBOutlet UITextField *txtPwd; 

@end 

@implementation ViewController 

- (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
} 

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}
- (IBAction)LoginClick:(id)sender {
  //前后去空格
  NSString *userName = [_txtUser.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
  NSString *userPwd = [_txtPwd.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; 

  NSDictionary *jsonDic = [self getJsonData:userName userpwd:userPwd];
  NSString* loginFlag = [jsonDic objectForKey:@"loginFlag"];
  NSLog(@"%@",loginFlag); 

  [self aletrInfo:loginFlag];
}
- (IBAction)registButton:(id)sender {
  UIStoryboard *storboard = self.storyboard;
  registViewController *vc2 = [storboard instantiateViewControllerWithIdentifier:@"vc2"];
  [self presentViewController:vc2 animated:YES completion:nil];
}
//用于请求PHP 获得JSON
- (NSDictionary *)getJsonData:(NSString *)user_name userpwd:(NSString *)user_pwd {
  NSError *error;
  NSString *urlString = [NSString stringWithFormat:@"http://192.168.1.106/iosLogin/index.php?action=login&user_name=%@&user_pwd=%@",user_name,user_pwd];
  //加载一个NSURL对象
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
  //将请求的url数据放到NSData对象中
  NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
  //IOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中
  NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];
  NSLog(@"接收到的数据为%@",jsonDic);
  return jsonDic;
}
//弹出信息
- (void)aletrInfo:(NSString *)loginFlag{
  UIAlertView *alert = [[UIAlertView alloc]init];
  [alert setTitle:@"提示"]; [alert setDelegate:nil];
  [alert addButtonWithTitle:@"确定"]; 

  if ([loginFlag isEqual: @"0"]) {
    [alert setMessage:@"账号或密码错误"];
  }
  if ([loginFlag isEqual:@"1"]) {
    [alert setMessage:@"登陆成功"];
  }
  [alert show];
} 

@end

在注册按钮能够跳转界面前，要先将stroyboard中的注册界面的stroyboard ID设置为vc2才可以进行跳转。

代码如下:

NSString *urlString = [NSString stringWithFormat:@"http://192.168.1.106/iosLogin/index.php?action=login&user_name=%@&user_pwd=%@",user_name,user_pwd];

其中这里的192.168.1.106可以写localhost也可以写自己的ip地址。
写到这里就可以先进行调试一下登录了。后面的注册用户代码也和这里差不多。

3.2注册界面代码
先在registViewCongroller.h中import ViewController.h
#import "ViewController.h" 
然后是registViewController.m中的代码。

//
// registViewController.m
// iosLogin
//
// Created by 曹晗 on 16/2/27.
// Copyright 2016年 CaoHan. All rights reserved.
// 

#import "registViewController.h" 

@interface registViewController ()
@property (weak, nonatomic) IBOutlet UITextField *txtUser;
@property (weak, nonatomic) IBOutlet UITextField *txtPwd; 

@end 

@implementation registViewController 

- (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view.
} 

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}
//这个是注册按钮
- (IBAction)registButton:(id)sender {
  NSString *userName = [_txtUser.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
  NSString *userPwd = [_txtPwd.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; 

  NSDictionary *jsonDic = [self getJsonData:userName userpwd:userPwd];
  NSString* registFlag = [jsonDic objectForKey:@"registFlag"];
  NSLog(@"%@",registFlag); 

  [self aletrInfo:registFlag]; 

}
//这个是返回按钮
- (IBAction)returnButton:(id)sender {
  [self dismissModalViewControllerAnimated:YES];
} 

- (NSDictionary *)getJsonData:(NSString *)user_name userpwd:(NSString *)user_pwd {
  NSError *error;
  NSString *urlString = [NSString stringWithFormat:@"http://192.168.1.106/iosLogin/index.php?action=regist&user_name=%@&user_pwd=%@",user_name,user_pwd];
  //加载一个NSURL对象
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
  //将请求的url数据放到NSData对象中
  NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
  //IOS5自带解析类NSJSONSerialization从response中解析出数据放到字典中
  NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];
  NSLog(@"接收到的数据为%@",jsonDic);
  return jsonDic;
} 

- (void)aletrInfo:(NSString *)registFlag{
  UIAlertView *alert = [[UIAlertView alloc]init];
  [alert setTitle:@"提示"]; [alert setDelegate:nil];
  [alert addButtonWithTitle:@"确定"]; 

  if ([registFlag isEqual: @"0"]) {
    [alert setMessage:@"用户名已存在"];
  }
  if ([registFlag isEqual:@"1"]) {
    [alert setMessage:@"注册成功"];
  }
  [alert show];
} 

@end

到这里所有的代码都已经写完了，我是一个新手，如果有不足或者代码错误之处还请指出。谢谢各位读者。

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