IOS 学习笔记 2015-04-08 OC-NSUserDefaults 持久化对象
NSUserDefaults适合存储轻量级的本地数据,比如要保存一个登陆界面的数据,用户名、密码之类的;
NSUserDefaults被设计用来存储设备和应用的配置信息,它通过一个工厂方法返回默认的、也是最常用到的实例对象。这个对象中储存了系统中用户的配置信息,开发者可以通过这个实例对象对这些已有的信息进行修改,也可以按照自己的需求创建新的配置项。
NSUserDefaults把配置信息以字典的形式组织起来,支持字典的项包括:字符串或者是数组,除此之外还支持数字等基本格式。一句话概括就 是:基础类型的小数据的字典。操作方法几乎与NSDictionary的操作方法无异,另外还可以通过指定返回类型的方法获取到指定类型的返回值。

在这需要着重介绍下 保存 自定义对象类型
假如简单的将自定义对象放入NSUserdefaults 中去存储是不会成功,我们需要转换下思路,我们需要将对象转换成NSData,再去存储
简单的说就是自定义对象需要实现NSConding 协议,并且实现两个方法,分别是 encodeWithCoder和 initWithCoder
下面看代码吧
1 文件结构
//
// WPUser.h
// OC-NSUserDefaults
//
// Created by wangtouwang on 15/4/8.
// Copyright (c) 2015年 wangtouwang. All rights reserved.
// #import <Foundation/Foundation.h> @interface WPUser : NSObject<NSCoding>
@property NSString *account;
@property NSString *paw;
@end //
// WPUser.m
// OC-NSUserDefaults
//
// Created by wangtouwang on 15/4/8.
// Copyright (c) 2015年 wangtouwang. All rights reserved.
// #import "WPUser.h" @implementation WPUser -(void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:self.account forKey:@"account"];
[aCoder encodeObject:self.paw forKey:@"paw"];
} -(id)initWithCoder:(NSCoder *)aDecoder{
if (self = [super init]) {
self.account = [aDecoder decodeObjectForKey:@"account"];
self.paw = [aDecoder decodeObjectForKey:@"paw"];
}
return self;
} @end
//
// TurnViewController.h
// OC-NSUserDefaults
//
// Created by wangtouwang on 15/4/8.
// Copyright (c) 2015年 wangtouwang. All rights reserved.
// #import <UIKit/UIKit.h> @interface TurnViewController : UIViewController -(void)saveData:(UIButton *)btn; @end //
// TurnViewController.m
// OC-NSUserDefaults
//
// Created by wangtouwang on 15/4/8.
// Copyright (c) 2015年 wangtouwang. All rights reserved.
// #import "TurnViewController.h"
#import "WPUser.h" @interface TurnViewController ()
//保存字符串数据
@property(nonatomic,strong) UILabel *stringLable;
@property(nonatomic,strong) UITextField *stringTextFile; //保存NSNumber类型
@property(nonatomic,strong) UILabel *numberLable;
@property(nonatomic,strong) UITextField *numberField; //保存日期类型
@property(nonatomic,strong) UILabel *dateLable;
@property(nonatomic,strong) UITextField *dateField; //保存数组类型
@property(nonatomic,strong) UILabel *arrayLable;
@property(nonatomic,strong) UITextField *array_ALable;
@property(nonatomic,strong) UITextField *array_BLable; //保存集合类型
@property(nonatomic,strong) UILabel *dicLable;
@property(nonatomic,strong) UITextField *dic_ALable;
@property(nonatomic,strong) UITextField *dic_BLable; //保存BOOL类型
@property(nonatomic,strong) UILabel *boolLable;
@property(nonatomic,strong) UITextField *boolField; //保存对象类型 //保存按钮 然后跳转
@property(nonatomic,strong) UIButton *viewButton; @end @implementation TurnViewController - (void)viewDidLoad {
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor grayColor]]; self.stringLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.stringLable.text=@"保持字符串数据";
self.stringLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.stringTextFile=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.stringTextFile.borderStyle=UITextBorderStyleRoundedRect;
self.stringTextFile.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.stringLable];
[self.view addSubview:self.stringTextFile]; self.numberLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.numberLable.text=@"保持数值类型";
self.numberLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.numberField=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.numberField.borderStyle=UITextBorderStyleRoundedRect;
self.numberField.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.numberLable];
[self.view addSubview:self.numberField]; self.dateLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.dateLable.text=@"保持日期类型";
self.dateLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.dateField=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.dateField.borderStyle=UITextBorderStyleRoundedRect;
self.dateField.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.dateLable];
[self.view addSubview:self.dateField]; self.arrayLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.arrayLable.text=@"保持数组类型";
self.arrayLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.array_ALable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.array_ALable.borderStyle=UITextBorderStyleRoundedRect;
self.array_ALable.font= [UIFont fontWithName:@"Helvetica" size:];
self.array_BLable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.array_BLable.borderStyle=UITextBorderStyleRoundedRect;
self.array_BLable.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.arrayLable];
[self.view addSubview:self.array_ALable];
[self.view addSubview:self.array_BLable]; self.dicLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.dicLable.text=@"保持集合类型";
self.dicLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.dic_ALable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.dic_ALable.borderStyle=UITextBorderStyleRoundedRect;
self.dic_ALable.font= [UIFont fontWithName:@"Helvetica" size:];
self.dic_BLable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.dic_BLable.borderStyle=UITextBorderStyleRoundedRect;
self.dic_BLable.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.dicLable];
[self.view addSubview:self.dic_ALable];
[self.view addSubview:self.dic_BLable]; self.boolLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.boolLable.text=@"保持布尔类型";
self.boolLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.boolField=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.boolField.borderStyle=UITextBorderStyleRoundedRect;
self.boolField.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.boolLable];
[self.view addSubview:self.boolField]; self.viewButton = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
self.viewButton.backgroundColor=[UIColor redColor];
[self.viewButton setTitle:@"保存" forState:UIControlStateNormal];
[self.viewButton.layer setCornerRadius:10.0]; //设置矩形四个圆角半径
[self.view addSubview:self.viewButton];
[self.viewButton addTarget:self action:@selector(saveData:) forControlEvents:UIControlEventTouchUpInside]; } -(void)saveData:(UIButton *)btn{ NSLog(@"准备保存数据");
//通过NSUserDefaults保存数据
NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
//保存字符串类型
[ud setObject:self.stringTextFile.text forKey:@"string"];
//保存数值类型
[ud setInteger:self.numberField.text.intValue forKey:@"number"];
//保存日期类型
NSDateFormatter *format = [[NSDateFormatter alloc] init];
format.dateFormat=@"yy-MM-dd HH:mm";
[ud setObject:[NSDate date] forKey:@"date"];
//保存数组类型
NSArray *array = [[NSArray alloc] initWithObjects:self.array_ALable.text,self.array_BLable.text, nil];
[ud setObject:array forKey:@"array"];
//保存集合类型
NSMutableDictionary *md = [[NSMutableDictionary alloc] initWithObjectsAndKeys:nil];
[md setObject:self.dic_ALable.text forKey:@"dicA"];
[md setObject:self.dic_BLable.text forKey:@"dicB"];
[ud setObject:md forKey:@"dictionary"];
[ud setBool:YES forKey:@"BOOL"]; //保存对象类型
WPUser *user = [[WPUser alloc] init];
user.account = @"zhangjie";
user.paw=@"";
NSData *udObject = [NSKeyedArchiver archivedDataWithRootObject:user];
[ud setObject:udObject forKey:@"user"];
udObject = nil;
[self.navigationController popViewControllerAnimated:YES]; } @end
//
// WPViewController.h
// OC-NSUserDefaults
//
// Created by wangtouwang on 15/4/8.
// Copyright (c) 2015年 wangtouwang. All rights reserved.
// #import <UIKit/UIKit.h> @interface WPViewController : UIViewController @end //
// WPViewController.m
// OC-NSUserDefaults
//
// Created by wangtouwang on 15/4/8.
// Copyright (c) 2015年 wangtouwang. All rights reserved.
// #import "WPViewController.h"
#import "TurnViewController.h"
#import "WPUser.h" @interface WPViewController () //保存字符串数据
@property(nonatomic,strong) UILabel *stringLable;
@property(nonatomic,strong) UITextField *stringTextFile; //保存NSNumber类型
@property(nonatomic,strong) UILabel *numberLable;
@property(nonatomic,strong) UITextField *numberField; //保存日期类型
@property(nonatomic,strong) UILabel *dateLable;
@property(nonatomic,strong) UITextField *dateField; //保存数组类型
@property(nonatomic,strong) UILabel *arrayLable;
@property(nonatomic,strong) UITextField *array_ALable;
@property(nonatomic,strong) UITextField *array_BLable; //保存集合类型
@property(nonatomic,strong) UILabel *dicLable;
@property(nonatomic,strong) UITextField *dic_ALable;
@property(nonatomic,strong) UITextField *dic_BLable; //保存BOOL类型
@property(nonatomic,strong) UILabel *boolLable;
@property(nonatomic,strong) UITextField *boolField; //保存对象类型 //显示按钮
@property(nonatomic,strong) UIButton *viewButton;
//转向填写数据页面
@property(nonatomic,strong) UIButton *turnButton; //转向保存数据页面
-(void)turnPage;
//显示保存数据
-(void)viewData; @end @implementation WPViewController - (void)viewDidLoad {
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor grayColor]]; self.stringLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.stringLable.text=@"保持字符串数据";
self.stringLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.stringTextFile=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.stringTextFile.borderStyle=UITextBorderStyleRoundedRect;
self.stringTextFile.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.stringLable];
[self.view addSubview:self.stringTextFile]; self.numberLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.numberLable.text=@"保持数值类型";
self.numberLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.numberField=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.numberField.borderStyle=UITextBorderStyleRoundedRect;
self.numberField.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.numberLable];
[self.view addSubview:self.numberField]; self.dateLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.dateLable.text=@"保持日期类型";
self.dateLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.dateField=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.dateField.borderStyle=UITextBorderStyleRoundedRect;
self.dateField.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.dateLable];
[self.view addSubview:self.dateField]; self.arrayLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.arrayLable.text=@"保持数组类型";
self.arrayLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.array_ALable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.array_ALable.borderStyle=UITextBorderStyleRoundedRect;
self.array_ALable.font= [UIFont fontWithName:@"Helvetica" size:];
self.array_BLable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.array_BLable.borderStyle=UITextBorderStyleRoundedRect;
self.array_BLable.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.arrayLable];
[self.view addSubview:self.array_ALable];
[self.view addSubview:self.array_BLable]; self.dicLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.dicLable.text=@"保持集合类型";
self.dicLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.dic_ALable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.dic_ALable.borderStyle=UITextBorderStyleRoundedRect;
self.dic_ALable.font= [UIFont fontWithName:@"Helvetica" size:];
self.dic_BLable=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.dic_BLable.borderStyle=UITextBorderStyleRoundedRect;
self.dic_BLable.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.dicLable];
[self.view addSubview:self.dic_ALable];
[self.view addSubview:self.dic_BLable]; self.boolLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
self.boolLable.text=@"保持布尔类型";
self.boolLable.font = [UIFont fontWithName:@"Helvetica" size:];
self.boolField=[[UITextField alloc] initWithFrame:CGRectMake(, , , )];
self.boolField.borderStyle=UITextBorderStyleRoundedRect;
self.boolField.font= [UIFont fontWithName:@"Helvetica" size:];
[self.view addSubview:self.boolLable];
[self.view addSubview:self.boolField]; self.viewButton = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
self.viewButton.backgroundColor=[UIColor redColor];
[self.viewButton setTitle:@"显示" forState:UIControlStateNormal];
[self.viewButton.layer setCornerRadius:10.0]; //设置矩形四个圆角半径
[self.view addSubview:self.viewButton];
[self.viewButton addTarget:self action:@selector(viewData) forControlEvents:UIControlEventTouchUpInside]; self.turnButton = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
[self.turnButton setTitle:@"转向" forState:UIControlStateNormal];
self.turnButton.backgroundColor=[UIColor redColor];
[self.turnButton.layer setCornerRadius:10.0]; //设置矩形四个圆角半径
[self.view addSubview:self.turnButton];
[self.turnButton addTarget:self action:@selector(turnPage) forControlEvents:UIControlEventTouchUpInside];
} -(void)turnPage{
NSLog(@"Ready TURN SAVE DATA PAGE");
[self.navigationController pushViewController:[TurnViewController new] animated:YES];
} -(void)viewData{
NSLog(@"READY VIEW SAVE DATA");
//通过NSUserDefaults读取数据
NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
self.stringTextFile.text=[ud objectForKey:@"string"];
self.numberField.text= [NSString stringWithFormat: @"%lu", [ud integerForKey:@"number"]];
NSDateFormatter *format = [[NSDateFormatter alloc] init];
format.dateFormat=@"yy-MM-dd HH:mm";
NSLog(@"%@",[ud objectForKey:@"date"]);
self.dateField.text=[format stringFromDate:[ud objectForKey:@"date"]];;
NSArray *array = [ud objectForKey:@"array"];
self.array_ALable.text=(NSString *)array[];
self.array_BLable.text=(NSString *)array[];
NSDictionary *dic = [ud dictionaryForKey:@"dictionary"];
self.dic_ALable.text=[dic objectForKey:@"dicA"];
self.dic_BLable.text=[dic objectForKey:@"dicB"];
self.boolField.text=[NSString stringWithFormat: @"%i", [ud boolForKey:@"BOOL"]]; NSData *udObject = [ud objectForKey:@"user"];
WPUser *wpuser = [NSKeyedUnarchiver unarchiveObjectWithData:udObject] ;
if (wpuser!=nil) {
NSLog(@"account = %@",wpuser.account);
NSLog(@"paw = %@",wpuser.paw);
}
} @end
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