NSFileManager(文件管理类)

NSFileManager(文件管理类)

 文件管理类, 对文件进行管理 

    NSFileManager *fm = [NSFileManager defaultManager];
    NSString *filePath = [NSString stringWithFormat:@"%@/image", NSHomeDirectory()];
    NSLog(@"%@", filePath);
    //创建文件夹
    NSError *error = nil;
    BOOL result = [fm createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:&error];
    if (result) {
        NSLog(@"创建成功");
    } else {
        NSLog(@"创建失败: %@", error);
    } 

移动文件夹

    NSString *documentpath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
    NSString *filePath1 = [NSString stringWithFormat:@"%@/image", documentpath];
    BOOL result =[fm moveItemAtPath:filePath toPath:filePath1 error:&error];
    if (result) {
        NSLog(@"创建成功");
    } else {
        NSLog(@"创建失败: %@", error);
    }
    NSString *imagePath = [[NSBundle mainBundle] bundlePath];
    NSString *imagePath1 = [filePath1 stringByAppendingPathComponent:@"1.jpg"];
    BOOL result =[fm copyItemAtPath:imagePath toPath:imagePath1 error:&error];
        if (result) {
            NSLog(@"创建成功");
        } else {
            NSLog(@"创建失败: %@", error);
        }

保存图片

    NSURL *url = [NSURL URLWithString:@"http://img3.douban.com/view/event_poster/median/public/4cdefe4f77918b1.jpg"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        NSString *filePath = [NSString stringWithFormat:@"%@/1.jpg", NSHomeDirectory()];
        NSLog(@"%@", filePath);
        BOOL result = [data writeToFile:filePath atomically:YES];
        if (result) {
            NSLog(@"写入成功");
        } else {
            NSLog(@"写入失败");
        }
    }];