Downloading file from Google Drive using iOS SDK - ios

Question

I'm trying to download file from Google Drive using the SDK provided for iOS. But it is giving me this error:
Error Domain=com.google.HTTPStatus Code=400 "(null)"
Here is the download code:
GTLDriveFile *file = [driveFiles objectAtIndex:indexPath.row];
NSString *url = [NSString stringWithFormat:#"https://www.googleapis.com/drive/v3/files/%#?alt=media",
file.identifier];
GTMSessionFetcher *fetcher = [self.service.fetcherService fetcherWithURLString:url];
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
if (error == nil) {
NSLog(#"Retrieved file content");
// Do something with data
} else {
NSLog(#"An error occurred: %#", error);
}
}];
However I'm able to list all the files and I double checked the bundle identifier as well.
Any suggestion what I'm missing?

Answer 1

Add key (API keys for iOS) param in URL
then try like following code:
GTLDriveFile *file;//Your Object
NSString *url = [NSString stringWithFormat:#"https://www.googleapis.com/drive/v3/files/%#?key=YOUR_KEY_iOS",
file.identifier];
GTMSessionFetcher *fetcher = [self.service.fetcherService fetcherWithURLString:url]; //GTLServiceDrive *service;
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
if (error == nil) {
NSLog(#"Retrieved file content");
// File Download here
} else {
NSLog(#"An error occurred: %#", error);
}
}];

Answer 2

I've tried Successfuly, but not use following code.NSString *url = [NSString stringWithFormat:#"https://www.googleapis.com/drive/v3/files/%#?alt=media",
file.identifier];
I use file.webContentLink.