ios开发过程中的简单的数据的存取

最新推荐文章于 2024-05-23 10:42:26 发布

原创最新推荐文章于 2024-05-23 10:42:26 发布 · 366 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#数据 #存储 #沙盒 #备份 #文档

ios 学习笔记专栏收录该内容

36 篇文章

订阅专栏

本文详细介绍了iOS应用程序的沙盒结构，包括应用程序包、Documents、Library/Caches等目录的用途及数据存储方式，并提供了获取这些目录路径的方法。

iOS沙盒结构分析：
应用程序包：（Bundle）包含了所有的资源文件和可执行文件
Documents：保存应用运行时生成的需要持久化的数据，iTunes同步设备时会备份该目录。例如，游戏应用可将游戏存档保存在该目录
Library/Caches：保存应用运行时生成的需要持久化的数据，iTunes同步设备时不会备份该目录。一般存储体积较大、不需要备份的非重要数据
Library/Preference：保存应用的所有偏好设置，iOS的设置应用会在该目录中查找应用的设置信息。iTunes同步设备时会备份该目录
tmp：保存应用运行时所需的临时数据，使用完毕后再将相应的文件从该目录删除。应用没有运行时，系统也可能会清除该目录下的文件。iTunes同步设备时不会备份该目录
 
几种目录获取方式：
NSString *home = NSHomeDirectory();//主目录
 
NSArray *documents = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = documents[0];//文档目录
NSArray *caches = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, NO);
NSString *cacheDir = caches[0];//缓存目录 
NSString *tmpDir = NSTemporaryDirectory();//临时目录

- (IBAction)pilstSave
{

    //获取沙盒路径

    NSString *path = NSHomeDirectory();

    NSLog(@"%@" , NSTemporaryDirectory());

    NSString *documentPath = [path stringByAppendingPathComponent:@"Documents"];

    NSArray *date = @[@"temp1" , @"temp2"];

    NSString *filePath = [documentPath stringByAppendingPathComponent:@"date.plist"];

    [date writeToFile:filePath atomically:YES];

    

}



- (IBAction)plistGet

{

    NSString *documentPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

    NSString *filePath = [documentPath stringByAppendingPathComponent:@"date.plist"];

    NSArray *array = [NSArray arrayWithContentsOfFile:filePath];

    NSLog(@"%@",array);

}



//偏好的存取

- (IBAction)pianhaoSave

{

    NSUserDefaults *defau = [NSUserDefaults standardUserDefaults];

    [defau setObject:@"xxb" forKey:@"name"];

    [defau setInteger:13 forKey:@"age"];

    //立即同步

    [defau synchronize];

}

- (IBAction)pianhaoGet

{

    NSUserDefaults *defau = [NSUserDefaults standardUserDefaults];

    NSString *name = [defau objectForKey:@"name"];

    NSInteger age = [defau integerForKey:@"age"];

    NSLog(@"%@  %d",name ,age);

}

/*

 NSCoding 的存取（ps：需要遵守<NSCoding>协议，需要重写

 - (void)encodeWithCoder:(NSCoder *)aCoder

 和

 - (id)initWithCoder:(NSCoder *)aDecoder）

 方法

 */



#import "XXBPerson.h"



@implementation XXBPerson



- (void)encodeWithCoder:(NSCoder *)aCoder

{

    [aCoder encodeObject:self.name forKey:@"name"];

    [aCoder encodeInteger:self.age forKey:@"age"];

}

- (id)initWithCoder:(NSCoder *)aDecoder

{

    if (self = [super init])

    {

        self.name = [aDecoder decodeObjectForKey:@"name"];

        self.age = [aDecoder decodeIntegerForKey:@"age"];

    }

    return self;

}

@end

- (IBAction)nscodingSave

{

    XXBPerson *p1 = [[XXBPerson alloc] init];

    p1.name = @"name1";

    p1.age = 13;

    XXBPerson *p2 = [[XXBPerson alloc] init];

    p2.name = @"name2";

    p2.age = 23;

    NSString *home = NSHomeDirectory();

    NSString *documentPath = [home stringByAppendingPathComponent:@"Documents"];

    NSString *filePath = [documentPath stringByAppendingPathComponent:@"person.date"];

    [NSKeyedArchiver archiveRootObject:@[p1,p2] toFile:filePath];

   // [NSKeyedArchiver archiveRootObject:p2 toFile:filePath];

}

存取数据

- (IBAction)nscodingGet

{

    NSString *home = NSHomeDirectory();

    NSString *documentsPath = [home stringByAppendingPathComponent:@"Documents"];

    NSString *filePath = [documentsPath stringByAppendingPathComponent:@"person.date"];

    NSArray *temp = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];

    XXBPerson *p1 = temp[0];

    XXBPerson *p2 = temp[1];

    NSLog(@"%@   %d",p1.name ,p1.age);

    NSLog(@"%@   %d",p2.name ,p2.age);

}