TextField's editable property doesn't behave as expected

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 5.1
• Cross-platform modules: 5.1
• Android Runtime: 5.1
• iOS Runtime: 5.1
• Plugin(s): 5.1

Describe the bug
I have a TextField with editable set to false. However if I tap quickly on the field while the app is resuming, I can change the text.

To Reproduce
Run this playground on iOS. Tap on any of the fields. Keyboard doesn't show (as expected). Minimise the app and then get back to it. Don't wait for it to fully load, tap quickly on some of the fields. You can now change the text.

Expected behavior
You should not be able to change the text.

Sample project
Here is the sample playground

Additional context
I believe the nativeView's delegate should be updated in initNativeView/disposeNativeView instead of in onLoaded/onUnloaded as it is now.

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Read tns-core-modules/ui/text-field/text-field.ios.ts around line 168, then reproduce the resume-and-tap sequence with the linked Playground on iOS. Compare the editable behavior during normal loading and app resumption; done means a non-editable TextField cannot be changed in either state.