NativeScript / NativeScript/angular

Outlets freeze when navigate to a nested route from another tab, only on Android

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bug-pending-triage
Dominant language
TypeScript
Stars
55
Forks
13
Avg merge
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Merged PRs (30d)
1

Description

Issue Description

Outlets freeze when we navigate to a nested route from another TabView only on Android. We have 5 tabs and 2 of them has nested routes. We use page-router-outlet and native/core TabView component.

Steps to reproduce:
Go to Tab 5 -> drill down 3 levels to the nested route -> click the button to navigate to Tab 2, which takes you to Tab 2 w/o any issues-> Go back to Tab 5, you are on the last screen (nested route) but it freezes. You can't go back or can't do anything on the screen. However on iOS, instead of freezing, it goes all the way back to the main outlet.
So apparently the iOS behavior is the intentional behavior of tabView, because tabView keeps only 1 view alive and it's the main outlets in our case?

Our tabView has the androidTabsPosition="bottom" option and we realized that this sets androidOffscreenTabLimit to 1 automatically, so it means only the current tab is alive. I tried adding the androidOffscreenTabLimit="3" option to the tabView (because we have max 3 level nested navigation on Tab 5) , the tabs are not frozen anymore, BUT now the interface jumps back to the main outlet (just like iOS). Any idea how to solve this ?

Also a side note, this started happening after NativeScript 8 upgrade. We were using bottomnavigationbar with NS7 but we had to change to tabView with NS8. We didn't have any freezing or jumping back to the main outlet issues before the update.

Any insight will be appreciated, thanks so much!

Reproduction

No response

Relevant log output (if applicable)

No response

Environment
node: 14.15.0
npm: 7.6.1
nativescript: 8.1.2

### Dependencies

```json
"dependencies": {
  "@angular/animations": "~13.1.1",
  "@angular/common": "~13.1.1",
  "@angular/compiler": "~13.1.1",
  "@angular/core": "~13.1.1",
  "@angular/forms": "~13.1.1",
  "@angular/platform-browser": "~13.1.1",
  "@angular/platform-browser-dynamic": "~13.1.1",
  "@angular/router": "~13.1.1",
  "@nativescript-community/ui-material-bottomnavigationbar": "^6.2.5",
  "@nativescript/angular": "^13.0.0",
  "@nativescript/core": "~8.1.1",
  "@nativescript/email": "^2.0.5",
  "@nativescript/geolocation": "^8.0.2",
  "@nativescript/theme": "~3.0.1",
  "@nstudio/nativescript-cardview": "^2.0.1",
  "@nstudio/nativescript-floatingactionbutton": "^3.0.4",
  "moment": "^2.29.1",
  "nativescript-mapbox-sdk": "file:../well-finder-smartphone-app-.nativescript-mapbox-sdk/src",
  "nativescript-ripple": "^4.0.1",
  "nativescript-ui-sidedrawer": "^10.0.2",
  "nativescript-windowed-modal": "^7.0.0",
  "rxjs": "~7.4.0",
  "zone.js": "~0.11.4"
},
"devDependencies": {
  "@angular-devkit/build-angular": "~13.1.1",
  "@angular/compiler-cli": "~13.1.1",
  "@nativescript/android": "8.1.1",
  "@nativescript/debug-ios": "^1.0.0",
  "@nativescript/ios": "8.1.0",
  "@nativescript/types": "~8.1.1",
  "@nativescript/webpack": "~5.0.0",
  "@ngtools/webpack": "~13.1.1",
  "@types/geojson": "^7946.0.8",
  "node-sass": "^7.0.1",
  "typescript": "~4.4.4"
}
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Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the reported flow with NativeScript 8.1.2, the native/core TabView, page-router-outlet, five tabs, and nested routes on Android. Compare androidOffscreenTabLimit values of 1 and 3, then verify that returning from Tab 2 to the nested Tab 5 route neither freezes nor unexpectedly returns to the main outlet.

Written by the indexing model from the issue text.

Assessment

Tech stack
angular, typescript
Domain
frontend, mobile-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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