Reading .xlsx file iOS Objective C - ios

Question

I am trying to download .xlsx file from server using AFNetworking. But it gives me error saying:
Error Domain=com.alamofire.error.serialization.response Code=-1016 "Request failed: unacceptable content-type: application/zip" UserInfo={NSLocalizedDescription=Request failed: unacceptable content-type: application/zip
It shows whole response inside the NSError.
I don't want to use any third party library as I am integrating this in my SDK itself.

Answer 1

To Download .xlsx file in AFNetworking2.x. You can't use this code. This code is for Json Serialization.
Reason:
/*
In AFURLResponseSerialization.m this line will convert downloaded data to json, which make invalid serialization error
*/
responseObject = [NSJSONSerialization JSONObjectWithData:data options:self.readingOptions error:&serializationError];
NOT Working Code :
// This code will not work for XLSX File
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:#"application/json", #"text/json", #"text/javascript", #"text/html", nil];
[manager GET:#"Link to xlsx File" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"JSON: %#", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
}];
Use this :
https://github.com/AFNetworking/AFNetworking/tree/2.x#creating-a-download-task
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSURL *URL = [NSURL URLWithString:#"Link to xlsx File"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
NSURL *documentsDirectoryURL = [[NSFileManager defaultManager] URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:nil];
return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
} completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
NSLog(#"File downloaded to: %#", filePath);
}];
[downloadTask resume];