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# OpenCV iOS Hello

## Goal

In this tutorial we will learn how to:

- Link OpenCV framework with Xcode
- How to write simple Hello World application using OpenCV and Xcode.

## Linking OpenCV iOS

Follow this step by step guide to link OpenCV to iOS.

1. Create a new XCode project.
2. Now we need to link opencv2.framework with Xcode. Select the project Navigator in the left hand panel and click on project name.
3. Under the TARGETS click on Build Phases. Expand Link Binary With Libraries option.
4. Click on Add others and go to directory where opencv2.framework is located and click open
5. Now you can start writing your application.

## Hello OpenCV iOS Application

Now we will learn how to write a simple Hello World Application in Xcode using OpenCV.

- Link your project with OpenCV as shown in previous section.
- Open the file named NameOfProject-Prefix.pch ( replace NameOfProject with name of your project) and add the following lines of code.

    #ifdef __cplusplus
    #import <opencv2/opencv.hpp>
    #endif

- Add the following lines of code to viewDidLoad method in ViewController.m.

    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Hello!" message:@"Welcome to OpenCV" delegate:self cancelButtonTitle:@"Continue" otherButtonTitles:nil];
    [alert show];

- You are good to run the project.

## Output

## Help and Feedback

You did not find what you were looking for?

- Ask a question on the Q&A forum.
- If you think something is missing or wrong in the documentation, please file a bug report.

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