ios 數據持久化之沙盒

1,訪問沙盒路徑

    //1,home主目錄裏面有,Documents,Library,tmp和一個應用程序
    NSLog(@"Home:%@",NSHomeDirectory());
    //2,Documents
    NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSLog(@"%@",documentsPath);
    //3,Library
    NSString *libraryPath = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
    NSLog(@"%@",libraryPath);
    //4,tmp
    NSLog(@"tmp:%@",NSTemporaryDirectory());
    //5,caches
    NSString *cachesPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
    NSLog(@"%@",cachesPath);
    //6,user
    NSString *user = NSUserName();
    NSLog(@"user:%@",user);
    
    //7,NSBundle:圖片路徑
    NSString *bundle = [[NSBundle mainBundle] pathForResource:@"1" ofType:@"png"];
    NSLog(@"bundle:%@",bundle);

2,簡單文件寫入

//1,獲取文件路徑
    NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSLog(@"%@",documentsPath);
    //2,拼接文件路徑
    NSString *file = [documentsPath stringByAppendingString:@"/myText.txt"];
    //3,準備寫入的內容
    NSString *content = @"Hello World!";
    
    //4,寫入(下面yes是原子性,整個寫入,no有多少寫多少)
    [content writeToFile:file atomically:YES encoding:NSUTF8StringEncoding error:nil];
    
    //讀取
    NSString *readString = [NSString stringWithContentsOfFile:file encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"%@",readString);

3,

 //NSArray
    //1,獲取document路徑
    //2,拼接文件路徑
    NSString *arrayPath = [documentsPath stringByAppendingString:@"/array.plist"];
    //3,準備內容
    NSArray *array = @[@"123",@"456",@"789"];
    //4,寫入
    [array writeToFile:arrayPath atomically:YES];
    
    //5,讀取
    NSArray *readArray = [NSArray arrayWithContentsOfFile:arrayPath];
    NSLog(@"%@",readArray);
    
    //NSDictionary
    //1,獲取文件路徑
    //2,拼接文件路徑
    NSString *dictPath = [documentsPath stringByAppendingString:@"/dict.plist"];
    //3,準備寫入的內容
    NSDictionary *dict = @{@"name": @"張強",@"age":@"21"};
    //4,寫入內容
    [dict writeToFile:dictPath atomically:YES];
    //5,讀取
    NSDictionary *readDict = [NSDictionary dictionaryWithContentsOfFile:dictPath];
    NSLog(@"%@",readDict);