xiblint

The xiblint script will test .xib and .storyboard files for compliance with best practices and team policies.

The linter messages contain the position within the XML files, and if applicable, an Object ID which can be used in conjunction with Xcode's Find in Workspace to jump to the problematic object in the .xib or .storyboard file.

Rules

accessibility_format

Checks for incorrect use of Lyft extensions accessibilityFormat and accessibilitySources.
accessibility_labels_for_images

Checks for images with accessibility enabled and no accessibility label. In this case, VoiceOver will announce the image asset's name, which might be unwanted.
accessibility_labels_for_image_buttons

Checks for image buttons with no accessibility label. In this case, VoiceOver will announce the image asset's name, which might be unwanted.
accessibility_labels_for_text_with_placeholder

Checks for text fields and views with a placeholder and no accessibility label. This addresses common confusion about placeholderText coming instead of accessibilityLabel.
autolayout_frames

Checks for ambiguous and misplaced views.
automation_identifiers

Makes sure that interactive views have accessibility identifiers, to support testing through UI Automation.
automation_identifiers_for_outlet_labels

Checks for labels with outlets into a view controller that have no accessibility identifiers. Labels with outlets might get dynamic text, and therefore should be accessible to UI testing.
enforce_runtime_attributes

Ensures a runtime attribute is set to one of the allowed values. Configure runtime_attributes in a custom rule configuration using rules_config (see below). Use null as an option to allow no value.
enforce_system_properties

Ensures a property in a system type is set to one of the allowed values. Configure system_properties in a custom rule configuration using rules_config (see below). Use null as an option to allow default value.
named_colors

Ensures all colors are using named colors from an asset catalog. Configure allowed_colors to limit the colors to a subset (default is all named colors are allowed), allow_system_colors (default is false), allow_clear_color (default is false) and ignore_alpha (default is false) in a custom rule configuration using rules_config (see below).
no_trait_variations

Ensures Trait Variations are disabled.
simulated_metrics_retina4_0

Ensures simulated metrics are for the iPhone SE, which is currently the smallest display profile.
no_view_controller_links_to_other_bundles

Ensures there are no links to other storyboards in different bundles.
strict_fonts

Ensures all font names and sizes are in an allowed set. Configure allowed_fonts with an array of dictionaries containing a name and size in a custom rule configuration using rules_config (see below).
strict_font_names

Ensures all font namess are in an allowed set. Configure allowed_fonts and allow_system_fonts (default is true) in a custom rule configuration using rules_config (see below). This is a good option if strict_fonts is too strict.
strict_font_sizes

Ensures all font sizes are above a minimum font size. Configure minimum_size (default is 0) and/or maximum_size (default is 1000) in a custom rule configuration using rules_config (see below). This is a good option if strict_fonts is too strict.
unavailable_custom_classes

Prevent a list of classes from appearing as custom classes. Configure custom_classes in a custom rule configuration using rules_config (see below). This is a mapping of the full name of the class (ModuleName.ClassName) to the suggested replacement.
unavailable_system_classes

Ensures a system type uses a set of custom clases. Configure system_classes in a custom rule configuration using rules_config (see below).

Usage

For a list of available rules, run xiblint -h.

Place a configuration file named .xiblint.json into the root of your source repository. A sample configuration file would be:

{
  "rules": [
    "accessibility_format",
    "autolayout_frames"
  ],
  "paths": {
    "Pods": {
      "rules": []
    },
    "InaccessibleFeature": {
      "excluded_rules": [
        "accessibility_*"
      ]
    },
    "Modules": {
      "rules": ["some_rule"],
      "rules_config": {
        "some_rule": {
          "some_rule_specific_option": true
        }
      }
    }
  }
}

Then simply invoke xiblint in the source repository.

--reporter

If you find yourself in need of a different structure of the output, there is the --reporter option. You are able to choose from the default one, raw, or a json one. To switch between them, use the following:

xiblint --reporter json
xiblint --reporter raw

Specyfing paths

Sometimes you want to lint only a few files and forget about the rest - for instance, when you want to lint only delta changes. For this case you can specify your files after the xiblint command:

xiblint "Project/Base.lproj/LaunchScreen.storyboard" "Project/Base.lproj/Main.storyboard"

If you want to combine paths with the reporter option, don't forget to put the option before listing the paths:

xiblint --reporter json "Project/Base.lproj/LaunchScreen.storyboard" "Project/Base.lproj/Main.storyboard"

Installation

Using pip:

pip install xiblint

Manual:

git clone https://github.com/lyft/xiblint.git
cd xiblint && python setup.py install

Contributing

Code of conduct

This project is governed by Lyft's code of conduct. All contributors and participants agree to abide by its terms.

Sign the Contributor License Agreement (CLA)

We require a CLA for code contributions, so before we can accept a pull request we need to have a signed CLA. Please visit our CLA service and follow the instructions to sign the CLA.

File issues in GitHub

Use GitHub issue to file bugs or enhancement requests. You may also use GitHub issues to discuss before implementing a change.

Submit pull requests

Our only method of accepting code changes is through GitHub pull requests.