+(NSFileManager *)defaultManager;//获得文件管理对象

-(BOOL)createFileAtPath:(NSString *)path contents:(NSData *)data attributes:(NSDictionary *)attr;//创建文件

-(BOOL)fileExistsAtPath:(NSString *)path;//判断一个文件是否存在

-(BOOL)fileExistsAtPath:(NSString *)path isDirectory:(BOOL *)isDirectory;

-(BOOL)copyItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;文件复制

-(BOOL)moveItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError**)error;文件移动

-(BOOL)removeItemAtPath:(NSString *)path error:(NSError **)error;/文件删除

// 如何进行浅度遍历
    NSString *dirPath=@"/Users/administrator/Desktop/---";
    NSFileManager *fm= [NSFileManager defaultManager];
    NSArray *arr = [fm contentsOfDirectoryAtPath:dirPath error:nil];
    NSLog(@"%@",arr);
    
    //如何进行深度遍历
    NSString *dirPath=@"/Users/administrator/Desktop/---";
    NSFileManager *fm= [NSFileManager defaultManager];
   NSDirectoryEnumerator *dirs=[fm enumeratorAtPath:dirPath];
    NSString *path=[dirs nextObject];
    while(path!=nil)
    {
        NSLog(@"%@",path);
        path=[dirs nextObject];
    }
    //创建一个NSFileManager对象
    NSFileManager *fm=[NSFileManager defaultManager];
    NSString *path=@"/Users/administrator/Desktop/1.txt";
    
    NSString *str=@"这是我创建的一个文件";
    // 如何将字符串类型转化为NSdata;
    NSData *data=[str dataUsingEncoding:NSUTF8StringEncoding];
    BOOL flag=[fm createFileAtPath:path contents:data attributes:nil];
    if(flag){
     //success;
        //读取文件内容，转化为字符串
        NSString *fileContent=[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
        NSLog(@"%@",fileContent);
    }else{
      //fail
    }