//存数据
- (void)saveArray
{// 1.获得沙盒根路径NSString *home = NSHomeDirectory();// 2.document路径NSString *docPath = [home stringByAppendingPathComponent:@"Documents"];// 3.新建数据NSArray *data = @[@"jack", @10, @"ffdsf"];NSString *filepath = [docPath stringByAppendingPathComponent:@"data.plist"];[data writeToFile:filepath atomically:YES];
}//读取数据
- (IBAction)read {// 1.获得沙盒根路径NSString *home = NSHomeDirectory();// 2.document路径NSString *docPath = [home stringByAppendingPathComponent:@"Documents"];// 3.文件路径NSString *filepath = [docPath stringByAppendingPathComponent:@"data.plist"];// 4.读取数据NSArray *data = [NSArray arrayWithContentsOfFile:filepath];NSLog(@"%@", data);
}

- (IBAction)save {// 1.利用NSUserDefaults,就能直接访问软件的偏好设置(Library/Preferences)NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];// 2.存储数据[defaults setObject:@"mm" forKey:@"account"];[defaults setObject:@"123" forKey:@"pwd"];[defaults setInteger:10 forKey:@"age"];[defaults setBool:YES forKey:@"auto_login"];// 3.立刻同步
    [defaults synchronize];
}- (IBAction)read {NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];NSString *account = [defaults objectForKey:@"account"];BOOL autoLogin = [defaults boolForKey:@"auto_login"];NSLog(@"%@ -- %d", account, autoLogin);
}

#import "ViewController.h"
#import "Student.h"@interface ViewController ()
- (IBAction)save;
- (IBAction)read;
@end@implementation ViewController- (void)viewDidLoad
{[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.
}- (IBAction)save {// 1.新的模型对象Student *stu = [[Student alloc] init];stu.no = @"42343254";stu.age = 20;stu.height = 1.55;// 2.归档模型对象// 2.1.获得Documents的全路径NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];// 2.2.获得文件的全路径NSString *path = [doc stringByAppendingPathComponent:@"stu.data"];// 2.3.将对象归档
    [NSKeyedArchiver archiveRootObject:stu toFile:path];
}- (IBAction)read {// 1.获得Documents的全路径NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];// 2.获得文件的全路径NSString *path = [doc stringByAppendingPathComponent:@"stu.data"];// 3.从文件中读取MJStudent对象Student *stu = [NSKeyedUnarchiver unarchiveObjectWithFile:path];NSLog(@"%@ %d %f", stu.no, stu.age, stu.height);
}
@end

#import <Foundation/Foundation.h>@interface Student : NSObject  <NSCoding>
@property (nonatomic, copy) NSString *no;
@property (nonatomic, assign) double height;
@property (nonatomic, assign) int age;
@end

#import "Student.h"@interface Student() @end@implementation Student/***  将某个对象写入文件时会调用*  在这个方法中说清楚哪些属性需要存储*/
- (void)encodeWithCoder:(NSCoder *)encoder
{[encoder encodeObject:self.no forKey:@"no"];[encoder encodeInt:self.age forKey:@"age"];[encoder encodeDouble:self.height forKey:@"height"];
}/***  从文件中解析对象时会调用*  在这个方法中说清楚哪些属性需要存储*/
- (id)initWithCoder:(NSCoder *)decoder
{if (self = [super init]) {// 读取文件的内容self.no = [decoder decodeObjectForKey:@"no"];self.age = [decoder decodeIntForKey:@"age"];self.height = [decoder decodeDoubleForKey:@"height"];}return self;
}
@end