How to compress/resize image on iOS before uploading to a server?

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This snippet will resize the image:

UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

The variable newSize is a CGSize and can be defined like so:

CGSize newSize = CGSizeMake(100.0f, 100.0f);

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