結合MD5加密的方式,簡單介紹一下登錄保存賬號密碼的邏輯
前言:
1."NSString+Hash.h"是一個MD5加密的分類
2.這里使用了Apache搭建了一個簡單的本地服務器來進行演示
3.使用NSURLConnection演示發(fā)送登錄請求,請求字段匹配(userId.intValue == 1),代表登錄成功,此時將真確的賬號密碼保存至偏好設置
4.首次登錄,對密碼進行一次MD5加密,將加密后的密碼發(fā)送至服務器
5.設置一個標識用于判斷是否為首次登錄,首次登錄對密碼進行加密
6.iOS7后蘋果加入了鑰匙串的功能,這里將信息保存至沙盒演示

#import "ViewController.h"
#import "NSString+Hash.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *tf_username;
@property (weak, nonatomic) IBOutlet UITextField *tf_password;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    //從沙盒獲取用戶名和密碼
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    
    NSString *username = [defaults objectForKey:@"username"];
    NSString *password = [defaults objectForKey:@"password"];
    
    //給控件賦值
    self.tf_username.text = username;
    self.tf_password.text = password;
    
}
- (IBAction)loginBtnClick:(id)sender {
    
    //獲取用戶名和密碼
    NSString *username = self.tf_username.text;
    NSString *password = self.tf_password.text;
    
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSNumber *flag = [defaults objectForKey:@"flag"];
    //如果是第一次
    if (!flag.boolValue) {
        password = [password md5String];
        //更改標識
        [defaults setObject:@YES forKey:@"flag"];
        [defaults synchronize];
    }

    //1. URL
    NSURL *url = [NSURL URLWithString:@"http://127.0.0.1/login.php"];
    
    //2. 根據(jù)URL創(chuàng)建請求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    //設置請求體的數(shù)據(jù)
    NSString *string = [NSString stringWithFormat:@"username=%@&password=%@",username,password] ;
    //設置請求體
    request.HTTPBody = [string dataUsingEncoding:NSUTF8StringEncoding];
    //設置請求方法
    request.HTTPMethod = @"POST";
    
    //3.建立連接發(fā)送請求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

        if (connectionError != nil || data == nil) {
            NSLog(@"請求失敗");
        }

        //數(shù)據(jù)解析/反序列化
        NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];
        
        NSNumber *userId = [dict objectForKey:@"userId"];
        
        //判斷是否登錄成功
        if (userId.intValue == 1) {
            //保存用戶名
            [defaults setObject:username forKey:@"username"];
            [defaults setObject:password forKey:@"password"];
            
            //同步一下, iOS8以后不需要調用,系統(tǒng)會自動調用
            [defaults synchronize];
            
        }
        
        NSLog(@"%@",dict);
    }];

}

@end