如何在iOS中更改URL中的内容?

问题描述：

我有一个URL，其中包含图像和音频文件.我正在使用以下代码将图像和音频文件下载到文档目录:

I am having a URL in which it contains images and audio files. I am downloading the images and audio files to document directory by using the below code:

  // urlsArray contains the list of images and audio urls

 for(int i= 0 ;i<[urlsArrray count]; i++)
        {

        NSString *urlString = [urlsArrray objectAtIndex:i];
        NSString *escapedUrlString = [urlString             stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url = [NSURL URLWithString:escapedUrlString];
    NSData *fileData=[NSData dataWithContentsOfURL:url];
    NSString *urlstring1 = [url absoluteString];
    NSArray *parts = [urlstring1 componentsSeparatedByString:@"/"];
    NSString *fileName = [parts objectAtIndex:[parts count]-1];

    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString *documentsDir = [paths objectAtIndex:0];
    NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:fileName];
    [fileManager createFileAtPath:savedImagePath contents:fileData attributes:nil];

    NSLog(@"files Stored Path is %@",savedImagePath);

现在我要分离图像和音频文件.我想将图像下载到文档目录，将音频文件下载到缓存目录.

Now I want to seperate the images and audio files. I want to download images to document directory and audio files to cache directory.

答

只需添加以下代码即可识别文件是图像文件还是音频文件

Just add following code to recognize the file whether it is image or audio file

CFStringRef fileExtension = (CFStringRef) [file pathExtension];
CFStringRef fileUTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, fileExtension, NULL);

if (UTTypeConformsTo(fileUTI, kUTTypeImage)) NSLog(@"It's an image");
else if (UTTypeConformsTo(fileUTI, kUTTypeMovie)) NSLog(@"It's a movie");
else if (UTTypeConformsTo(fileUTI, kUTTypeText)) NSLog(@"It's text");
else  NSLog(@"It's audio");

如何在iOS中更改URL中的内容?

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