17869497: UIAKeyboard.typeString() cannot set value on invalid element: UIATextField

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Description

Summary:
I have been plagued by this problem for over a year.

Steps to Reproduce:

To reproduce:

1. clone this repository: https://github.com/jmoody/animated-happiness
2. build and run the 'chou' target with Xcode 5.1.1 with base SDK 7* simulator or physical device
3. launch Instruments 5.1.1, target the chou app on the target from 2.
4. execute the follow script in a UIAutomation template

var target = UIATarget.localTarget();

for (i = 0; i < 1000; i++) { 
    UIALogger.logDebug("starting iteration: " + i)
    target.frontMostApp().mainWindow().elements()["first page"].textFields()["text"].setValue("");
    target.frontMostApp().mainWindow().elements()["first page"].textFields()["text"].tap();
    target.frontMostApp().keyboard().typeString("Hello");
    target.frontMostApp().keyboard().typeString("\n");
    target.delay(1);
}

Increase the number iterations until you get a failure.

For fun, try a more complicated string like: "}=k,Gk-f"&7{2&ZRq$2zyzsq#y.R,?<R)T;w,xQYm€*3!,Nu?PY"

Expected Results:

Expected

UIAKeyboard.typeString() to work without error.

Actual Results:

Actual

VerboseError: Cannot set value on invalid element: UIATextField from UIATextField

Version:

• OS X 10.9.4 (13E28)
• Xcode 5.1.1
• Instruments 5.1.1
• iOS 7

Notes:

• uia_type_string fails to input the correct case or incorrectly touches the wrong character on _devices_ calabash/calabash-ios#269
• calabash - intermittent uia failures - "a JSON text must at least contain two octets!" calabash/calabash-ios#259
• http://stackoverflow.com/questions/10549046/target-frontmostapp-keyboard-failed-to-locate-key-n

Related iOS 8b4

https://devforums.apple.com/message/1013742#1013742

Product Version: 5.1.1
Created: 2014-07-31T12:19:44.076598
Originated: 2014-07-31T14:17:00
Open Radar Link: http://www.openradar.me/17869497