iOS programming involves developing applications for Apple devices such as the iPhone and iPad. It requires proficiency in languages like Objective C and Swift. Objective C was the primary language used by Apple for macOS and iOS operating systems, and their APIs (Application Programming Interfaces) prior to the introduction of Swift. Swift is more powerful, safe, and easy to learn, which makes it a go-to language for iOS application development today. Swift also provides seamless compatibility with Objective C, resulting in simpler code that's easy to use and read.

Proficiency in iOS (Objective C, Swift) means you're comfortable with Apple's iOS SDK (Software Development Kit) and tools like Xcode, the IDE (Integrated Development Environment) for creating apps for macOS, iOS, watchOS, and tvOS. Knowledge about the Cocoa Touch, Apple's UI (User Interface) framework, is essential as it includes technologies needed to develop groundbreaking apps.

The ability to integrate APIs and data from third parties, understanding of RESTful APIs, and experience with performance and memory tuning tools are additional skills that potential employers find attractive.

Familiarity with iOS's UI/UX design standards is crucial. This includes the ability to design applications following Apple's design philosophy, which prioritizes a simple, intuitive interface and fluid, user-friendly interaction.

A strong foundation in object-oriented programming, data structures, and algorithms, along with problem-solving abilities, can serve as a stepping stone for mastering iOS (Objective C, Swift). Having knowledge of software development methodologies like Agile or Scrum can be beneficial. Also, understanding version control tools such as Git helps with team collaboration and maintaining different versions of software projects.

Above all, strong debugging skills are vital to any iOS developer. An ability to solve system crashes efficiently and address memory leak issues using instruments and other tools is a significant asset.

Typically, creativeness, a detail-oriented mindset, and excellent communication skills are qualities that complement technical iOS skills. These competencies help in understanding user requirements, working as part of development teams, and in interfacing with project managers and stakeholders.

Mastering iOS (Objective C, Swift) can open up job opportunities such as iOS Developer, App Developer, Mobile Software Engineer, and many more in the tech industry. It can also pave the way to work in project management, if coupled with the appropriate managerial and leadership skills.