- 应用沙盒
- 归档
- 偏好设置
- Plist
应用沙盒
Documents
Library -- Caches
-- Preferences
tmp
归档
Person.h
#import <Foundation/Foundation.h>
@interface Person : NSObject <NSCoding>
/** 姓名 */
@property(nonatomic,copy) NSString* name;
/** 昵称 */
@property(nonatomic,copy) NSString* nickName;
@end
Person.m
#import "Person.h"
@implementation Person
// 归档：只要一个自定义对象归档的时候就会调用,告诉系统 哪些属性需要归档
- (void)encodeWithCoder:(NSCoder *)coder
{
[coder encodeObject:_name forKey:@"name"]; // 给属性设置一个key
[coder encodeObject:_nickName forKey:@"nickName"];
}
//解档：只要一个自定义对象解档的时候就会调用,告诉系统 解析key得到的值，赋值给哪个属性
- (id)initWithCoder:(NSCoder *)aDecoder{
// 什么时候调用 [super initWithCoder]
if (self = [super init]) {
_name = [aDecoder decodeObjectForKey:@"name"];
_nickName = [aDecoder decodeObjectForKey:@"nickName"];
}
return self;
}
@end
ViewController.m
#import "ViewController.h"
#import "Person.h"
//---------------思路----------------
//1、创建自定义对象
// 重写encodeWithCoder 归档
// initWithCoder方法 解档
//2、创建路径 /caches
//3、使用归档类方法进行存储
// 使用解档类方法进行解档
//-----------------------------------
@interface ViewController ()
- (IBAction)save:(id)sender;
- (IBAction)read:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)save:(id)sender {
// 1、创建对象
Person *p = [[Person alloc] init];
p.name = @"李明";
p.nickName = @"hahaha";
// 2.1、创建路径/tmp，使用函数
NSString *cachesPath = NSTemporaryDirectory();
// 2.2、拼接路径;扩展名随意写，苹果对内容进行了加密
NSString *path = [cachesPath stringByAppendingString:@"person.data"];
// 3、使用归档类方法进行存储
[NSKeyedArchiver archiveRootObject:p toFile:path];
}
- (IBAction)read:(id)sender {
NSString *cachesPath = NSTemporaryDirectory();
NSString *path = [cachesPath stringByAppendingString:@"person.data"];
Person *p = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
NSLog(@"%@,%@",p.name,p.nickName);
}
@end
归档：什么时候调用super initWithCoder
#import "MyView.h"
@implementation MyView
// 解析文件的时候调用
// 作用:解析xib,storyboard调用
// 可以猜测 我们平时在storyboard中拖动的控件，是通过归档存储的，当创建的时候就解析 归档文件 然后实例化
- (id)initWithCoder:(NSCoder *)aDecoder{
// 这里必须调用[super initWithCoder:aDecoder],super ->UIView
// 什么时候调用[super initWithCoder:aDecoder],只要父类遵守了NSCoding协议,就调用[super initWithCoder:aDecoder]
if(self = [super initWithCoder:aDecoder])
{
NSLog(@"调用了initWithCoder");
}
return self;
}
@end
偏好设置
#import "ViewController.h"
@interface ViewController ()
- (IBAction)save:(id)sender;
- (IBAction)read:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)save:(id)sender {
// /Library/Preferences
// 获取单例对象
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setValue:@"YChiong" forKey:@"name"];
[userDefaults setObject:@"xmg" forKey:@"address"];
[userDefaults setBool:YES forKey:@"isHandSome"];
[userDefaults setInteger:25 forKey:@"age"];
}
- (IBAction)read:(id)sender {
// 获取单例对象
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *name = [userDefaults valueForKey:@"name"];
NSString *address = [userDefaults objectForKey:@"address"];
BOOL isHandSome = [userDefaults boolForKey:@"isHandSome"];
NSInteger age = [userDefaults integerForKey:@"age"];
NSLog(@"%@,%@,%i,%i",name,address,isHandSome,age);
}
@end
Plist
#import "ViewController.h"
@interface ViewController ()
- (IBAction)save:(id)sender;
- (IBAction)read:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)save:(id)sender {
// 1、创建数组或者字典
NSArray *arr = @[@"YChiong",@25];
// 2、创建存储路径
// 2.1 /Library/Caches文件夹
// 参数：
// NSSearchPathDirectory directory：获取哪个文件夹
// NSSearchPathDomainMask domainMask：在哪个范围下获取 NSUserDomainMask:在用户的范围内搜索?
// BOOL expandTilde：expandTilde是否展开全路径,YES:展开
// 返回值：一个数组
NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
// 2.2 拼接路径
NSString *plistPath = [cachePath stringByAppendingPathComponent:@"YChiong.plist"];
// 3、存储数组/字典 到 指定路径
[arr writeToFile:plistPath atomically:YES];
}
- (IBAction)read:(id)sender {
// 怎么存，就怎么取
NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
NSString *plistPath = [cachePath stringByAppendingPathComponent:@"YChiong.plist"];
NSArray *arr = [NSArray arrayWithContentsOfFile:plistPath];
NSLog(@"%@",arr);
}
@end
