Scraping data from the web using Kanna and Alamofire in Swift is a viable option when APIs aren't available or well-structured, allowing developers to access various types of data, including upcoming metal shows in New York City. By setting up a starter project with CocoaPods, installing necessary dependencies, making HTTP requests, and configuring App Transport Security settings, developers can begin scraping HTML content from websites. The Kanna library is used for parsing the scraped content, utilizing CSS selectors or XPath queries to navigate through the HTML document. In this example, the code extracts text nodes containing concert data by using regular expressions to identify specific patterns in the HTML markup. Once the data is parsed, it's displayed in a UITableView for easy consumption, providing an interactive experience for users interested in upcoming metal shows. By leveraging web scraping techniques and Swift development tools like Kanna and Alamofire, developers can build iOS applications that access diverse types of data from the internet, expanding their creative possibilities.