文件操作

// file:///var/containers/Bundle/Application/4256C1D8-84BC-4F4C-A5A2-BCAAF8A83D2C/OTC_heartStick.app/pack_demo.txt
    // url讀取是以 file://開始的
    NSURL *urlDemo = [[NSBundle mainBundle] URLForResource:@"pack_demo.txt" withExtension:nil];
    // 沒有中文情況下可以使用  直接轉string類型數據
    NSString *urlString = [urlDemo absoluteString];
    NSLog(@"%@", urlString);
    NSString *contentOne = [NSString stringWithContentsOfURL:urlDemo encoding:NSUTF8StringEncoding error:nil];
    
    // 直接以/xxxx/xxx，，，，開始
    NSString *path = [[NSBundle mainBundle] pathForResource:@"pack_demo.txt" ofType:nil];
    // 獲取內容
    NSString *contenttwo = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"%@---%@", contentOne, contenttwo);
    
    // 返回路徑的組成部分 <__NSArrayM 0x100956340>(
//    /,
//    var,
//    containers,
//    Bundle,
//    Application,
//    0B43ABDC-17AA-4BA3-BF10-B0DC129A2D07,
//    OTC_heartStick.app,
//    pack_demo.txt
//    )
    NSArray *patharray = [path pathComponents];
    NSLog(@"%@", patharray);
    // 返回路徑最后組成部分 txt
    NSString *str = [path lastPathComponent];
    // 這種方式有一點不好，就是需要添加/
    [path stringByAppendingString:@"/appFile.text"];
    // 不需要添加/
    [path stringByAppendingPathComponent:@"appFile.text"];
    // 刪除最后的組成部分
    str = [path stringByDeletingLastPathComponent];
    // 刪除擴展名(.text被刪除了)
    str = [path stringByDeletingPathExtension];
    // 獲取擴展名
    str = [path pathExtension];
    // 添加擴展名
    [path stringByAppendingPathExtension:@".jpg"];
    
    //存儲是有編碼方式的，編程字節碼
    //相當于Java中的解碼和編碼
    NSString *s = @"tsdfsdfsdfsdf";
    NSData *data = [s dataUsingEncoding:NSUTF8StringEncoding];
    s = [[NSString alloc] initWithData:data encoding:(NSUTF8StringEncoding)];
    
    //獲取沙盒目錄
    NSString *homePath = NSHomeDirectory();
    //在沙盒目錄中創建一個文件file.text
    NSString *filePath = [homePath stringByAppendingPathComponent:@"Documents/file.text"];
    //NSFileManager是單利模式, 所以不能使用alloc+init創建
    NSFileManager *manager = [NSFileManager defaultManager];
    NSString *strone = @"無線互聯";
    NSData *dataone = [strone dataUsingEncoding:NSUTF8StringEncoding];
    //參數：文件路徑、文件內容、文件的屬性
    BOOL sucess = [manager createFileAtPath:filePath contents:dataone attributes:nil];
    if(sucess){
        NSLog(@"文件創建成功");
    }else{
        NSLog(@"文件創建失敗");
    }
    //創建文件夾
    NSString *filePaths = [homePath stringByAppendingPathComponent:@"Documents/file"];
    NSError *error;
    //需要傳遞一個創建失敗的指針對象，記錄創建失敗的信息
    BOOL success1 = [manager createDirectoryAtPath:filePaths withIntermediateDirectories:YES attributes:nil error:&error];
    if(!success1){
        NSLog(@"創建成功");
    }else{
        NSLog(@"創建失敗");
    }
    
    NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSDictionary *fileAttr = [fileManager attributesOfItemAtPath:filePath error:nil];
    NSNumber *fileSize = [fileAttr objectForKey:NSFileSize];
    long long sizeValue = [fileSize longLongValue];
    NSLog(@"%@--%lld", fileSize, sizeValue);
    // 讀取到文件后，使用特定支付分割
    NSArray *arrayString = [contenttwo componentsSeparatedByString:@"\r\n"];