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developer.apple.com
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Official Apple developer site offering the docs, APIs, and tools you need to build iOS apps. It provides guides for Swift and SwiftUI, Xcode resources, design and Human Interface Guidelines, sample code, and access to WWDC sessions and other developer resources.
More resources on iOS Development
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r/iOSProgramming Resources
Community-curated list of resources
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Apple Developer Documentation
Official docs, tutorials, and sample code
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Kodeco
iOS tutorials, books, and paths (many free)
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Hacking with Swift
Free Swift and SwiftUI tutorials and projects
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Apple SwiftUI Tutorials
Learn iOS development with Apple's SwiftUI tutorials! Master the fundamentals and build beautiful, modern apps.
CourseFree
Hacking with Swift
Learn iOS development with Swift! Master coding through hands-on projects in this comprehensive course by Paul Hudson.