iOS app development requires a combination of tools and technologies to create engaging and functional applications. Key components include Xcode, Apple's integrated development environment (IDE), which provides everything needed to design, develop, and debug iOS apps. Swift, Apple's programming language, is fundamental for writing code efficiently and securely. Interface Builder within Xcode facilitates the creation of user interfaces using drag-and-drop functionality. Additionally, tools like Cocoa Pods and Carthage simplify dependency management, while XCTest and other testing frameworks ensure app reliability through comprehensive testing. Finally, integrating with Apple's ecosystem, including APIs for features like iCloud, Apple Pay, and ARKit, can enhance the app's functionality and user experience.