Text Detection with Vision Framework

TextDetection.m

- (void)detectWithImageURL:(NSURL *)URL
{
    VNImageRequestHandler *handler = [[VNImageRequestHandler alloc] initWithURL:URL options:@{}];
    VNDetectTextRectanglesRequest *request = [[VNDetectTextRectanglesRequest alloc] initWithCompletionHandler:^(VNRequest * _Nonnull request, NSError * _Nullable error) {
        if (error) {
            NSLog(@"%@", error);
        }
        else {
            for (VNTextObservation *textObservation in request.results) {
//                NSLog(@"%@", textObservation);
//                NSLog(@"%@", textObservation.characterBoxes);
                NSLog(@"%@", NSStringFromCGRect(textObservation.boundingBox));
                for (VNRectangleObservation *rectangleObservation in textObservation.characterBoxes) {
                    NSLog(@" |-%@", NSStringFromCGRect(rectangleObservation.boundingBox));
                }
            }
        }
    }];
    request.reportCharacterBoxes = YES;
    NSError *error;
    [handler performRequests:@[request] error:&error];
    if (error) {
        NSLog(@"%@", error);
    }
}