Incomplete Universal Character Name in UI Testing: A Troubleshooting Guide

Incomplete Universal Character Name in UI Testing: A Troubleshooting Guide

11 April 2024 Stephan Petzl Leave a comment Tech-Help

When engaging with UI Testing in Xcode 7, developers may encounter a peculiar warning that can cause some confusion. This warning, termed as “Incomplete universal character name”, appears after recording an interaction and having Xcode generate the corresponding code automatically. Let’s explore a solution to address this issue and ensure your UI tests run smoothly.

Understanding the Warning

The warning in question typically arises when using special characters in your UI test code. Here’s an example of what the generated code might look like and where the warning appears:

        - (void)testDoubleTapToolBarItem {
            [[[XCUIApplication alloc] init].tabBars.buttons[@"\U5173\U6ce8"] doubleTap];

Applying the Workaround

It appears that the issue stems from a bug within Xcode’s handling of universal character names. Fortunately, there’s a simple workaround that can resolve the warning and allow you to proceed with your testing.

Step-by-Step Solution:

  1. Locate the sequence in your code where the warning is generated.
  2. Identify the universal character names, which are represented by \U followed by a sequence of characters.
  3. Replace all instances of the uppercase \U with the lowercase \u.
  4. Ensure that the rest of the character sequence remains unchanged.

Here’s how the corrected code should look:

        - (void)testDoubleTapToolBarItem {
            [[[XCUIApplication alloc] init].tabBars.buttons[@"\u5173\u6ce8"] doubleTap];

By making this minor adjustment, the warning should no longer appear, and your UI test code will function as expected.


While encountering warnings during testing can be a setback, they often lead to a deeper understanding of the tools and languages we use. In this case, a simple substitution is all that’s needed to overcome the “Incomplete universal character name” warning in Xcode 7. With this guide, you should be able to continue developing and testing your application’s user interface without further interruptions.

If you find yourself facing other warnings or errors during your development journey, remember that the solution often lies in understanding the underlying cause and applying targeted fixes. Happy coding!

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