SwiftUI + Combine note

[vinhnx]

References: (note to self, add new articles on the top)

• https://duan.ca/2019/07/01/combine-hygiene/
• https://www.cocoawithlove.com/blog/twenty-two-short-tests-of-combine-part-1.html
• https://www.objc.io/blog/2019/07/02/lazy-loading/
• https://medium.com/flawless-app-stories/will-combine-kill-rxswift-64780a150d89
• https://medium.com/flawless-app-stories/problem-solving-with-combine-swift-4751885fda77
• https://github.com/learncombine/Combine101
• https://benoitpasquier.com/first-steps-apple-combine-framework-swift/
• https://github.com/AvdLee/CombineSwiftPlayground
• https://heckj.github.io/swiftui-notes/ 👍
• https://github.com/Juanpe/About-SwiftUI
• https://heckj.github.io/swiftui-notes/combine/
• https://github.com/kitasuke/SwiftUI-MVVM
• https://github.com/Jinxiansen/SwiftUI
• https://developer.apple.com/documentation/swiftui/state
• https://developer.apple.com/documentation/swiftui/state_and_data_flow
• https://github.com/vinhnx/CombineUnsplash // my own example, updating...
• https://github.com/chinsyo/awesome-swiftui
• https://mobile.twitter.com/peres/status/1136370518091751424
• https://gist.github.com/RuiAAPeres/d33e123f2df40d58162b29bec786a859
• https://mjtsai.com/blog/2019/06/03/swiftui-and-combine/
• https://wwdcbysundell.com/2019/swiftui-common-questions/
• https://mobile.twitter.com/johnsundell/status/1136194261941198848
• https://www.hackingwithswift.com/articles/194/get-started-with-swiftui
• https://wwdcbysundell.com/2019/swiftui-first-look/

SDK diffs:

• SwiftUI: https://gist.github.com/chriseidhof/b770a50641e3c430112bc404ca430b82/revisions?diff=unified
• Combine: https://gist.github.com/broadwaylamb/c2c8550d76b3ff851c4c1dbf0a872e26/revisions

==
since SwiftUI is value type
everytime you use reference type, use @ObjectBinding

@State

• view local
• value type
• framework managed

BindableObject:

• external
• reference type
• developer managed

@EnvironmentObject > @ObjectBinding
[use EnvironmentObject to pass data around view hierarchy indirectly
while ObjectBinding just to pass from superview to nearest child view (subsequently)]

@State > @binding

super View should have @State
child View should have @binding
superView @State [pass]-> childView @binding

reference: https://developer.apple.com/wwdc19/226

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TIL: SwiftUI List and ForEach reuse cell internally

https://twitter.com/jckarter/status/1143704650215858177?s=20

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SwiftUI together with Combine will change everything we knew about iOS/macOS/tvOS/watchOS or whateverOS development

[vinhnx]

#271

[vinhnx]

#342