iOS之文件管理器和文件对接器

文件管理器：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
#pragma mark - 文件管理器 创建
    //创建对象
    NSFileManager *manager = [NSFileManager defaultManager];
    
    //创建路径
    NSString *path = NSHomeDirectory();
  
    path = [path stringByAppendingPathComponent:@"test/myApp"];
    NSLog(@"path = %@", path);
    BOOL success = [manager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    if (success) {
        NSLog(@"文件创建成功");
    }else {
        NSLog(@"文件创建失败");
    }
    
    NSString *path2 = [path stringByAppendingPathComponent:@"test2/myApp"];
    NSLog(@"======%@", path2);
    [manager createDirectoryAtPath:path2 withIntermediateDirectories:YES attributes:nil error:nil];
    
#pragma mark - 文件管理器 添加
    //向文件夹添加字符串
    path = [path stringByAppendingPathComponent:@"zifuchuan.txt"];
   
    //初始化一个字符串
    NSString *string = @"今天是个号入职";
   BOOL success1 = [string writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
    if (success1) {
        NSLog(@"成功");
         NSLog(@"path=========%@", path);
    }else {
        NSLog(@"失败");
    }
    
    path = [path2 stringByAppendingPathComponent:@"new.text"];
    NSString *newStr = @"随便写点吧";
    [newStr writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"-------%@", path);
    
#pragma mark - 文件管理器 删除
    [manager removeItemAtPath:path error:nil];//删除的是该文件夹下的文档，该文件夹不能删除
#pragma mark - 文件管理器  移动、copy
    
    //Documents路径
    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    
    //创建一个文件夹     stringByDeletingLastPathComponent删除最后一部分内容
    NSString *copyPath = [documentPath stringByAppendingPathComponent:@"备份/text.txt"];
    [manager createDirectoryAtPath:[copyPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];
    NSString *str = @"往里面写内容的时候才有txt文本";
    NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];//字符串转换为data类型
    [manager createFileAtPath:copyPath contents:data attributes:nil];
    NSLog(@"-=-=-=-=-=%@", copyPath);
    
   //创建一个toPath  将copyPath中的内容移动/复制到toPath
    NSString *toPath = [documentPath stringByAppendingPathComponent:@"hello/wode.txt"];
    
    [manager createDirectoryAtPath:[toPath stringByDeletingLastPathComponent] withIntermediateDirectories:YES attributes:nil error:nil];
    //移动
    //[manager moveItemAtPath:copyPath toPath:toPath error:nil];
    NSLog(@"topath = %@", toPath);
    //复制
    [manager copyItemAtPath:copyPath toPath:toPath error:nil];
    
}

@end

文件对接器：

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
#pragma mark - 使用NSFileMessage创建文件
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
    NSString *strPath = [documentPath stringByAppendingPathComponent:@"file.txt"];
    
    [fileManager createFileAtPath:strPath contents:[@"hello" dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
    
    NSLog(@"%@", strPath);
    
#pragma mark - 使用NSFileHandle向文件里追加内容
    //创建handle对象
    NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:strPath];
    //搜索到文本内容末尾
    [fileHandle seekToEndOfFile];
    
    NSString *appendStr = @"我是handle的内容";
    [fileHandle writeData:[appendStr dataUsingEncoding:NSUTF8StringEncoding]];
    
    [fileHandle closeFile];
    
#pragma mark - 定位数据
    
    //将“123456”写入file2.txt文件夹中
    NSString * content = @"123456";
    NSString * filePath2 = [documentPath stringByAppendingPathComponent:@"file2.txt"];
    [fileManager createFileAtPath:filePath2 contents:[content dataUsingEncoding:NSUTF8StringEncoding] attributes:nil];
    
    //通过fileHandle读取
    fileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath2];
    //  获取数据长度
    NSUInteger length = [[fileHandle availableData] length];
    //  偏移量文件的一半
    [fileHandle seekToFileOffset:length/2.0];
    //从一半位置读取到最后
    NSData * data = [fileHandle readDataToEndOfFile];
    [fileHandle closeFile];
    //打印读取的字符串
    NSString * string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@",string);
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end