Here is a video of a state app gets into:

https://twitter.com/iospaulz/status/1221557272884563969

HarvestLoopBug.mov.zip

I was not able to type into the GitHub search bar as letters were processed in an incorrect order.

Within few seconds app generates over 1000 state changes while the time is running.

Using Stopwatch cause app to freeze with the warning in the console: UITableViewAlertForLayoutOutsideViewHierarchy

2020-01-26 14:18:28.959161-0800 Harvest-SwiftUI-Gallery[62071:3626159] [TableView] 
Warning once only: UITableView was told to layout its visible cells and other contents without
 being in the view hierarchy (the table view or one of its superviews has not been added to a 
window). This may cause bugs by forcing views inside the table view to load and perform layout 
without accurate information (e.g. table view bounds, trait collection, layout margins, safe area 
insets, etc), and will also cause unnecessary performance overhead due to extra layout passes. 
Make a symbolic breakpoint at UITableViewAlertForLayoutOutsideViewHierarchy to catch this in 
the debugger and see what caused this to occur, so you can avoid this action altogether if 
possible, or defer it until the table view has been added to a window. Table view: 
<_TtC7SwiftUIP33_BFB370BA5F1BADDC9D83021565761A4925UpdateCoalescingTableView: 0x7fbd1b127000; baseClass = UITableView; frame = (0 0; 375 320.667); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x60000300f5d0>; layer = <CALayer: 0x600003ed6a00>; contentOffset: {0, 0}; contentSize: {375, 132.9999974568685}; adjustedContentInset: {0, 0, 0, 0}; dataSource: <_TtGC7SwiftUIP10$10f027a4419ListCoreCoordinatorGVS_20SystemListDataSourceOs5Never_GOS_19SelectionManagerBoxS2___: 0x7fbd1976bbf0>>

Xcode: Version 11.3.1 (11C504)

This PR fixes the weird NavigationLink issue inside iterative List or ForEach that doesn't allow destination to get updated after its state changed.

I become aware of this bug in Xcode 12.3, but may be already reproducible in earlier version.

Fixes the problems mentioned in https://github.com/inamiy/Harvest-SwiftUI-Gallery/issues/14#issuecomment-619478666 , #15, and possibly #16 .

1. Go to Stopwatch
2. Start Timer
3. Back to main list
4. Go to other screen
5. All events get delayed or malformed due to Stopwatch (heavy task) is still running

After investigation, the slowest task was not in Stopwatch but rather TimeTravel where it collects all previous states as histories. With having a rapid event-flow, I discovered time-travelling will be the dominant cause of the UI glitches. This can be simply solved by removing time-travelling feature.

In this PR, usesTimeTravel is introduced so that one can easily test usesTimeTravel = false case, which is the normal non-debug configuration.

This PR works around #1 by setting .navigationViewStyle(StackNavigationViewStyle()) so that more stable run on macOS Catalyst is possible.

See also: https://twitter.com/paulcolton/status/1251162315291934720

This PR adds Conway's Game of Life example by importing Harvest-SwiftUI-GameOfLife which is separated from this repository.

This PR is also a SwiftUI modularization example to split into multiple UI frameworks.

Example

Successor of #7, #8 .

This PR is a further work of #7 to remove static func effectMapping's arguments (dirty dependency injection) to resurrect back to a pure function, since a better dependency injection can now be achieved by #8 controlling the World .

Retry of dependency injection #4 by controlling the World as Harvest is refactored in https://github.com/inamiy/Harvest/pull/23 .

cf. https://twitter.com/inamiy/status/1189593937830244353

This reverts #4 commit e69f582d41f08230487766c2a105523b2bf0b171.

Replacing to a better implementation introduced in https://github.com/inamiy/Harvest/pull/23 .

For Xcode iOS build CI.

See Also: Use SPM to build iOS target - Development / Package Manager - Swift Forums

xcodebuild can build Swift Package without .xcodeproj with passing product name to -scheme option and also recognizes -destination option.

This PR injects urlSession from outside of effectMapping by adding a constructor injection parameter, as questioned from @thomvis : https://twitter.com/thomvis/status/1189262950642663424

By the way, instead of passing around those dependencies, using a singleton as their container e.g. https://www.pointfree.co/blog/posts/21-how-to-control-the-world is also a valid and simpler solution.

I'm testing Harvest/HarvestStore out for use in a hybrid iOS/macOS project that I'm starting. I took the Gallery Application, and launched it on macOS. -- At a first glance it looks great!!

But when I go to use various screens, I started to notice various glitches:

• CounterExample click on the +/- counters -- nothing visibly happens.
• StateDiagram click on any of the buttons -- nothing visibly happens.
• GithubExample example crashes on load of the search results with EXC_BAD_INSTRUCTION
• TodoExample -- some things work, some filtering shows stale/blank data on Todo Items? Typing to add a new todo is an instant crash
• StopwatchExample -- everything works fine -- this is strange because of the other screen glitches!

It looks to me like these examples are being partially torn from their state somehow. So they're editing the global state, but reading from a blank new state, or they're editing local state, but reading from Global state.

Any advice? -- I'm not sure if the appropriate place to file this question is here, or on the main Harvest Repo?