接著上篇《iOS+PHP注冊登錄系統 PHP部分（上）》進行學習

3.iOS部分

上一次我們寫完了數據庫部分和PHP部分這次我們來完成iOS部分。
首先先在storyboard中一陣狂拖，弄成如下圖。
可以先在text Field中輸入用戶名和密碼 方便以後調試。

3.1登錄部分代碼

創建一個新的UIViewController 名為registViewController（用於注冊用戶，ViewController用於登錄）。
在ViewController.h中importregistViewController
#import "registViewController.h" 

然後設置登錄界面中的控件 用來寫用戶名的控件名設置為txtUser,密碼的控件名設置為txtPwd,確定按鈕的方法名稱為
LoginClick,注冊按鈕的方法名為registButton。
然後開始寫ViewController.m中的代碼

// 
// 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 { 
  //前後去空格 
  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]; 
} 
//用於請求PHP 獲得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]; 
  //加載一個NSURL對象 
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]; 
  //將請求的url數據放到NSData對象中 
  NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 
  //IOS5自帶解析類NSJSONSerialization從response中解析出數據放到字典中 
  NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error]; 
  NSLog(@"接收到的數據為%@",jsonDic); 
  return jsonDic; 
} 
//彈出信息 
- (void)aletrInfo:(NSString *)loginFlag{ 
  UIAlertView *alert = [[UIAlertView alloc]init]; 
  [alert setTitle:@"提示"]; [alert setDelegate:nil]; 
  [alert addButtonWithTitle:@"確定"]; 
   
  if ([loginFlag isEqual: @"0"]) { 
    [alert setMessage:@"賬號或密碼錯誤"]; 
  } 
  if ([loginFlag isEqual:@"1"]) { 
    [alert setMessage:@"登陸成功"]; 
  } 
  [alert show]; 
} 
 
@end 

在注冊按鈕能夠跳轉界面前，要先將stroyboard中的注冊界面的stroyboard ID設置為vc2才可以進行跳轉。

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

其中這裡的192.168.1.106可以寫localhost也可以寫自己的ip地址。
寫到這裡就可以先進行調試一下登錄了。後面的注冊用戶代碼也和這裡差不多。

3.2注冊界面代碼
先在registViewCongroller.h中import ViewController.h
#import "ViewController.h" 
然後是registViewController.m中的代碼。

// 
// 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. 
} 
//這個是注冊按鈕 
- (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]; 
   
} 
//這個是返回按鈕 
- (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]; 
  //加載一個NSURL對象 
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]; 
  //將請求的url數據放到NSData對象中 
  NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 
  //IOS5自帶解析類NSJSONSerialization從response中解析出數據放到字典中 
  NSDictionary *jsonDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error]; 
  NSLog(@"接收到的數據為%@",jsonDic); 
  return jsonDic; 
} 
 
- (void)aletrInfo:(NSString *)registFlag{ 
  UIAlertView *alert = [[UIAlertView alloc]init]; 
  [alert setTitle:@"提示"]; [alert setDelegate:nil]; 
  [alert addButtonWithTitle:@"確定"]; 
   
  if ([registFlag isEqual: @"0"]) { 
    [alert setMessage:@"用戶名已存在"]; 
  } 
  if ([registFlag isEqual:@"1"]) { 
    [alert setMessage:@"注冊成功"]; 
  } 
  [alert show]; 
} 
 
@end 

到這裡所有的代碼都已經寫完了，我是一個新手，如果有不足或者代碼錯誤之處還請指出。謝謝各位讀者。

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