iOS > UIButton Background from url

gistfile1.m

NSURL* url = [NSURL URLWithString:photoURL];

NSURLRequest* request = [[NSURLRequest alloc] initWithURL: url];
NSHTTPURLResponse *response = nil;
NSError *error = nil;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

UIImage* photo = [[UIImage alloc] initWithData:responseData];

[self.btn setImage:photo forState:UIControlStateNormal];