一、网络请求
发送网络请求，在响应头中通过response.MIMEType拿到文件的MIMEType类型
eg：NSURLConnection
- (NSString *)MIMEType:(NSURL *)url
{
// 1.创建一个请求
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLResponse *response = nil;
// 2.发送请求（返回响应）
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
// 3.获得MIMEType
return response.MIMEType;
}
二、通过UTTypeCopyPreferredTagWithClass方法
注意：需要导入 <MobileCoreServices/MobileCoreServices.h>
- (NSString *)mimeTypeForFileAtPath:(NSString *)path
{
if (![[[NSFileManager alloc] init] fileExistsAtPath:path]) {
return nil;
}
CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[path pathExtension], NULL);
CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass (UTI, kUTTagClassMIMEType);
CFRelease(UTI);
if (!MIMEType) {
//application/octet-stream 任意的二进制数据类型
return @"application/octet-stream";
}
return (__bridge NSString *)(MIMEType);
}
