文件管理

/*
         写入文件
         */
        
//        NSString * str = @"要写入文件中的内容";
//        NSError * error;
//        BOOL isWriteSuccess = [str writeToFile:@"/Users/song/Desktop/abc.txt" atomically:YES encoding:NSUTF8StringEncoding error: &error];
//        if (isWriteSuccess) {
//            NSLog(@"创建成功");
//        }else{
//            NSLog(@"创建失败：%@",error);
//        }
        
        //获取文件管理器
        NSFileManager * manager = [NSFileManager defaultManager];
        NSString * path = @"/Users/song/Desktop/测试";
        NSError * error;
        //attributesOfItemAtPath 获取文件属性
        NSDictionary * dic = [manager attributesOfItemAtPath:path error:&error];
        if (error == nil) {
            NSLog(@"%@",dic);
            NSLog(@"创建时间：%@",[dic objectForKey:NSFileCreationDate]);
        }else{
            NSLog(@"error :%@",error);
        }
        
        //contentsOfDirectoryAtPath获取文件夹下的内容,只能获取第一级目录
        NSArray<NSString *> * array = [manager contentsOfDirectoryAtPath:path error:&error];
        NSLog(@"文件夹下一级内容：%@",array);
        
        //subpathsOfDirectoryAtPath获取路径下目录各个层级内容
        NSArray * array2 = [manager subpathsOfDirectoryAtPath:path error:&error];
        NSLog(@"文件夹下的所有内容%@",array2);
        
        //createDirectoryAtPath创建文件夹
        BOOL isCreateSuccess = [manager createDirectoryAtPath:@"/Users/song/Desktop/测试/aaaaa" withIntermediateDirectories:YES attributes:nil error:&error];
        if (isCreateSuccess) {
            NSLog(@"创建文件成功");
        }else{
            NSLog(@"创建文件失败");
        }
        
        //moveItemAtPath移动目录,相当于剪切操作
        BOOL isMoveSuccess = [manager moveItemAtPath:@"/Users/song/Desktop/测试/fedcba" toPath:@"/Users/song/Desktop/测试/abcdef" error:&error];
        if (isMoveSuccess) {
            NSLog(@"移动成功");
        }else{
            NSLog(@"移动失败：%@",error);
        }
        
        //删除目录
        BOOL isRemoveSuccess = [manager removeItemAtPath:@"/Users/song/Desktop/测试/abcdef" error:&error];
        if (isRemoveSuccess) {
            NSLog(@"删除成功");
        }else{
            NSLog(@"删除失败：%@",error);
        }
        
        //拷贝文件
        BOOL isCopySuccess = [manager copyItemAtPath:@"/Users/song/Desktop/测试/abc.txt" toPath:@"/Users/song/Desktop/测试/aaaaa/abc.txt" error:&error];
        if (isCopySuccess) {
            NSLog(@"拷贝成功");
        }else{
            NSLog(@"拷贝失败：%@",error);
        }
        
        //获得文件
        NSData * data = [NSData dataWithContentsOfFile:@"/Users/song/Desktop/测试/abc.txt"];
        NSLog(@"文件大小：%ld",data.length);
        
        //创建文件
        BOOL isCreateFileSuccess = [manager createFileAtPath:@"/Users/song/Desktop/测试/abc2.txt" contents:data attributes:nil];
        if (isCreateFileSuccess) {
            NSLog(@"创建文件成功");
        }else{
            NSLog(@"创建文件失败：%@",error);
        }
        
        //移动文件
        BOOL isMoveFileSuccess = [manager moveItemAtPath:@"/Users/song/Desktop/测试/abc2.txt" toPath:@"/Users/song/Desktop/测试/aaaaa/abccc.txt" error:&error];
        if (isMoveFileSuccess) {
            NSLog(@"移动文件成功");
        }else{
            NSLog(@"移动文件失败：%@",error);
        }
        
        //删除文件
        BOOL isRemoveFileSuccess = [manager removeItemAtPath:@"/Users/song/Desktop/测试/aaaaa/abccc.txt" error:&error];
        if (isRemoveFileSuccess) {
            NSLog(@"删除文件成功");
        }else{
            NSLog(@"删除文件失败：%@",error);
        }