Add support for picker views (UIPickerView, UIDatePicker)

[hiaw]

I'm unable to scroll a standard iOS picker.

Description

Using the following code I was not able to scroll a standard picker.

await element(by.type('RCTPicker')).scroll(100, 'up')

I have also tried

await element(by.type('RCTPicker')).atIndex(0).scroll(100, 'up')
await element(by.type('UIPickerTableView')).atIndex(0).scroll(100, 'up')

Steps to Reproduce

Open up a standard picker and trying to scroll it.

await element(by.type('RCTPicker')).scroll(100, 'up')

I used the Xcode View hierachy tool to capture this tree, identifying the 3 UIPickerTableView as per error message.

Node, Device, Xcode and macOS Versions

• Node: 8.6.0
• Device: Macbook Pro, iPhone 7
• Xcode: 8.3.3
• macOS: 10.12.6

[aamorozov]

@hiaw I had similar issue but I think it is more related to the datepicker itself, as it's not wrapped up in any scrollview and hence the component itself is not scrollable

[LeoNatan]

This was implemented already.