一.ViewController.h中代码

////  ViewController.h//  归档登陆////  Created by 非凡程序员 on 15/6/12.//  Copyright (c) 2015年 wzhen. All rights reserved.//#import 
    
     @interface ViewController : UIViewController@property (weak, nonatomic) IBOutlet UITextField *name;@property (weak, nonatomic) IBOutlet UITextField *passworld;@property (weak, nonatomic) IBOutlet UILabel *reminder;- (IBAction)enter:(id)sender;@property (weak, nonatomic) IBOutlet UIButton *card;@end
    

二.ViewController.m中代码

////  ViewController.m//  归档登陆////  Created by 非凡程序员 on 15/6/12.//  Copyright (c) 2015年 wzhen. All rights reserved.//#import "ViewController.h"@interface ViewController ()@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)enter:(id)sender {    NSMutableData *mudate=[[NSMutableData alloc]init];//可变文件留,分配内存    NSKeyedArchiver *archiver=[[NSKeyedArchiver alloc]initForWritingWithMutableData:mudate];    NSString *setname=@"wangzhen";    NSString *setpassworld=@"888888";    [archiver encodeObject:setname forKey:@"setname"];    [archiver encodeObject:setpassworld forKey:@"setpassworld"];    [archiver finishEncoding];    [mudate writeToFile:@"/Users/feifanchengxuyuan/Desktop/enter.txt" atomically:YES];    NSKeyedUnarchiver *unarchiver=[[NSKeyedUnarchiver alloc]initForReadingWithData:mudate];    NSString *getname=[unarchiver decodeObjectForKey:@"setname"];    NSString *getpassworld=[unarchiver decodeObjectForKey:@"setpassworld"];    if ([_name.text isEqualToString:getname]) {        if ([_passworld.text isEqualToString:getpassworld]) {            [_reminder setText:@"登陆成功"];            NSLog(@"登录成功");  //        [_card setTitle:@"登录成功，进入下一个链接页面" forState:UIControlStateNormal];        }        else{            [_reminder setText:@"抱歉，您的登录名和密码不匹配"];                    }    }    else{        [_reminder setText:@"抱歉，您的登录名不存在"];    }    NSLog(@"name:%@,passworld:%@",getname,getpassworld);    }@end

三.隐藏显示的密码

勾选右侧中的Secure Text Entry