从目录中单独提取图片

Question

在缓存目录中保存了图片文件，然后再从目录中提取出来。

下面的代码是获取保存的全部文件：

[fileManager contentsOfDirectoryAtPath:pathForCacheDirectory error:&error]

怎么样从这里面单独提取出图片文件呢？图片文件格式不限。

Answer 1

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");