Google Images

There's another question that seems fairly similar, here.

If I understood one of the answers here. Google has deprecated their imageSearch api. The answer also provides a link to a new api, Google Custom Search, but that seems to only have the option to send text and receive images as search results. There doesn't appear to be a reverse image search available. I did however come across a third-party api by Tineye that seems to have a mobile api and things ready to go. Check it out HERE!

Note: I have not tried, nor do I have any affiliations with Tineye, I just came across it and thought I'd offer a suggestion.

Update

After some serious searching, I have solution no. 1 based on the answer: here.

If you upload your image to a server or backend of some sort, and generate a URL, you can submit it this way:

NSString * yourImageURL = //...//;
NSString * searchURL = @"https://www.google.com/searchbyimage?&image_url="

NSString * completeURL = [NSString stringWithFormat:@"%@%@", searchURL, yourImageURL];

Good luck!

When you're on the Google Images page scroll all the way to the bottom. There is a choice there to use either Google Tablet or Classic (defaults to tablet on the iPad). Click on classic and you should get the same options as on your mac/pc.