//兩種獲取應(yīng)用沙盒路徑的不同方法NSString *documentPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];NSString *cachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];NSString *preferencesPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Preferences"];NSString *tmpPath = [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];//NSSearchPathForDirectoriesInDomains()返回的是一個(gè)數(shù)組，這是因?yàn)閷τ贛ac OS可能會(huì)有多個(gè)目錄匹配某組指定的查詢條件，但是在iOS上只有一個(gè)匹配的目錄NSString *documentPath1 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject;NSString *cachePath1 = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;NSString *tmpPath1 = NSTemporaryDirectory();

//傳入一個(gè)json數(shù)據(jù)，返回一個(gè)foundation對象+ (id)JSONObjectWithData:(NSData *)data options:(NSJSONReadingOptions)opt error:(NSError * _Nullable *)error;

//傳入foundation對象，轉(zhuǎn)化為json數(shù)據(jù)+ (NSData *)dataWithJSONObject:(id)obj options:(NSJSONWritingOptions)opt error:(NSError * _Nullable *)error;

NSArray *array = @[@1, @2, @3]; NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:array,@"1",@"dongdong", @"name", nil];  //首先判斷能否轉(zhuǎn)化為一個(gè)json數(shù)據(jù)，如果能，接下來先把foundation對象轉(zhuǎn)化為NSData類型，然后寫入文件 if ([NSJSONSerialization isValidJSONObject:dic]) { NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:1 error:nil]; [jsonData writeToFile:jsonPath atomically:YES]; }  //在讀取的時(shí)候首先去文件中讀取為NSData類對象，然后通過NSJSONSerialization類將其轉(zhuǎn)化為foundation對象 NSData *jsonData = [[NSFileManager defaultManager] contentsAtPath:jsonPath]; NSArray *jsonDic = [NSJSONSerialization JSONObjectWithData:jsonData options:1 error:nil];