• 计算单个文件大小

+(float)fileSizeAtPath:(NSString *)path{
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if([fileManager fileExistsAtPath:path]){ long long size=[fileManager attributesOfItemAtPath:path error:nil].fileSize;
        return size/1024.0/1024.0;
    }
    return 0;
}

• 计算目录大小

+(float)folderSizeAtPath:(NSString *)path{
    NSFileManager *fileManager=[NSFileManager defaultManager];
    float folderSize;
    if ([fileManager fileExistsAtPath:path]) {
        NSArray *childerFiles=[fileManager subpathsAtPath:path];
        for (NSString *fileName in childerFiles) {
            NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
            folderSize +=[FileService fileSizeAtPath:absolutePath];
        }
　　　　　//SDWebImage框架自身计算缓存的实现
        folderSize+=[[SDImageCache sharedImageCache] getSize]/1024.0/1024.0;
        return folderSize;
    }
    return 0;
}

• 清除缓存文件

+(void)clearCache:(NSString *)path{
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:path]) {
        NSArray *childerFiles=[fileManager subpathsAtPath:path];
        for (NSString *fileName in childerFiles) {
            //如有需要，加入条件，过滤掉不想删除的文件
            NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
            [fileManager removeItemAtPath:absolutePath error:nil];
        }
    }
    [[SDImageCache sharedImageCache] cleanDisk];
}

• 数据存储到iCloud

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
    NSFileManager *fileManager = [[NSFileManager alloc] init];
    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
    NSURL *fileURL = [NSURL fileURLWithPath:[documentsPath stringByAppendingPathComponent:@"Document.pages"]];

    //这里的 identifier 应该设置为 entitlements 的第一个元素；当你使用这段代码的时候需要把 identifier 设置为你自己的真实 identifier
    NSString *identifier = nil;

    NSURL *ubiquitousContainerURL = [fileManager URLForUbiquityContainerIdentifier:identifier];
    NSURL *ubiquitousFileURL = [ubiquitousContainerURL URLByAppendingPathComponent:@"Document.pages"];

    NSError *error = nil;
    BOOL success = [fileManager setUbiquitous:YES
                                    itemAtURL:fileURL
                               destinationURL:ubiquitousFileURL
                                        error:&error];
    if (!success) {
        NSLog(@"[Error] %@ (%@) (%@)", error, fileURL, ubiquitousFileURL);
    }
});

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