In the realm of digital technology, the ubiquity of apps in our daily lives is an incontrovertible fact, and iOS app development is a remarkable player in this dynamic landscape. The quintessence of this article draws heavily from the latest industry reports, seeking to explore the depths of the iOS app development sector, elucidate the salient findings, and provide comprehensive insights.

The iOS app ecosystem has seen a meteoric rise in recent years, courtesy of Apple's commitment to offering sublime user experiences, coupled with the synergistic effects of sophisticated hardware and software. Underpinning this digital edifice is a legion of adept iOS app developers, who encode, design, and maintain a vast assortment of apps.

Let's begin our enthralling exploration of the iOS app development industry by diving into the fundamental who's - the app developers themselves. These are individuals and entities dexterously proficient in Swift, Objective-C, and other vital Apple frameworks. Proficiency in these languages and frameworks is non-negotiable, as they form the bedrock upon which iOS apps are built. The nuance here is the distinctiveness of Swift and Objective-C from other programming languages: they are proprietary to Apple, thus reinforcing Apple's notorious walled garden approach.

The when and where of iOS app development have been considerably decentralized over time. With the advent of remote work and cloud computing, developers from around the globe can collaborate on projects in real-time. The temporal and spatial dimensions of app development have thus undergone a paradigm shift from traditional in-house, 9-5 models to anytime, anywhere work.

The 'what' of iOS app development spans a broad spectrum, ranging from gaming and lifestyle apps to enterprise solutions. Every app is a confluence of functionality, design, and user experience, requiring a diverse skill set to conceive and execute. The recent surge in Augmented Reality (AR) and Machine Learning (ML) apps, thanks to ARKit and CoreML, exemplifies the industry’s constant evolution.

The 'how' of iOS development involves a meticulous process, starting from ideation to deployment and maintenance. This process is typically marked by stages such as requirement analysis, wireframing, prototyping, coding, testing, and deployment on the App Store. Each stage necessitates a unique skill set, thus fostering a collaborative environment.

The 'why' of iOS app development, being the raison d'être of the entire industry, is a fascinating area of discussion. From a developer's standpoint, the prospect of crafting innovative solutions that reach millions of users is a rewarding endeavor. For businesses, apps serve as a strategic tool to reach consumers, augment brand visibility, and drive revenue.

This recent report on iOS app development underscores the industry's robust growth trajectory, marked by a 20.3% increase in developer earnings in 2020, amounting to $200 billion since the App Store's inception. The rise of subscription-based models, contributing to over 90% of the App Store's top 100 grossing apps, was a notable finding, underscoring the shift in consumer preferences for value-based, long-term commitments over one-time purchases.

In conclusion, the iOS app development industry, with its labyrinth of complexities and endless possibilities, offers a fertile ground for innovation and growth. As ready purveyors of digital transformation, iOS app developers are catalyzing unprecedented changes in the way we interact with technology. As we navigate the contours of this dynamic landscape, it becomes increasingly apparent that the industry is poised for an exciting future, forever reshaping our digital experiences.