RadDataForm back navigation destroys iOS source binding

[NickIliev]

@Noppey commented on Wed Feb 05 2020

Environment Update available for component nativescript. Your current version is 6.3.0. Update available for component tns-core-modules. Your current version is 6.3.0-next-2020-02-05-134007-01 Update available for component tns-android. Your current version is 6.3.0 Component tns-ios has 6.3.0 version and is up to date.

Describe the bug RadDataForm does not bind properly on iOS when navigating back to the component with the form. After navigating back, you can change values in the form fields, but these values aren't propagated into the source object.

To Reproduce Open the playground project: Fill a value on "test" and click "Test" to verify. Then click "Next" to navigate away. Then click "back" and try to update the value on "test", the binding is now gone and "Test" (or anything else) won't update the value of the source variable anymore.

Expected behavior Source variable should be updated after navigating back to the form and changing values.

Sample project https://play.nativescript.org/?template=play-ng&id=vwLAH9&v=3

Additional context iOS issue only

[Noppey]

Any feedback, can you reproduce this? Can I work around this issue?

[erwindemoel]

We are having the same issue. When will this bug be fixed? Or is there a workaround we can use for this issue?

[manojdcoder]

Attaching the native delegate back on loaded event seems to solve the issue.

https://play.nativescript.org/?template=play-ng&id=vwLAH9&v=4

[mobifly-dev]

Attaching the native delegate back on loaded event seems to solve the issue.

https://play.nativescript.org/?template=play-ng&id=vwLAH9&v=4

Thank you, brillant! It works.

For someone else who need fast solution:

to observable: ` /**

• Fix for iOS. Issues related with:
• • observable binding
• • form styles crashing after navigate back
• @param args */ onDataFormLoaded(args: EventData) { const dataForm = args.object; if (dataForm._ios && dataForm._nativeDelegate && !dataForm._ios.delegate) { dataForm._ios.delegate = dataForm._nativeDelegate; } } ` xml:

loaded="{{ onDataFormLoaded }}"