Faux Pas

Tame latent bugs

Rules like these alert you to issues in your project that might manifest as bugs later down the line:

• Class implements -isEqual: but not -hash
• Undetached delegate or data source
• Fixed-format NSDateFormatter not using invariant (POSIX) locale
• …and many more

Find resource file errors

Are you sure you didn’t make a typo in the filename argument to [UIImage imageNamed:]? Did you remember to update all relevant code when you renamed that file? Are you shipping any resource files that are probably unused?

Faux Pas comes with 14 different rules that check for errors related to resource file usage.

Find localization errors

Is NSLocalizedString() referring to a key that does not exist? That exists for one locale but not another? Do all of the format specifiers in all the different translations match?

Faux Pas comes with 10 different rules that check for localization errors.

Find version control errors

Is your project referencing a file that is outside the version control root? Or a file that is ignored by the VCS?

Faux Pas comes with 4 different rules that check for version control errors.

Learn and enforce best practices

Overriding +initialize in a category? Specifying UIViewController NIB name outside of its implementation? Accessing the address book without specifying an NSContactsUsageDescription?

Faux Pas is useful even for experienced iOS/Mac developers, but it’s especially great for newcomers to Apple’s platforms.

Enforce code style

Do you want to enforce the usage of dot syntax whenever possible? Or just use it for properties declared with @property? What about NSNumber literals, boxed expressions, container literals, and object subscripting?

Faux Pas comes with 14 different rules that help you enforce stylistic constraints.

Get a checklist for code audits

Are you auditing or taking over an existing codebase?

Faux Pas will give you a nice overview of potential issues you might want to pay attention to.

Choose from 111 different rules

Faux Pas comes with 111 rules, categorized using tags like Resources, Style, or Config.

You can choose which rules you want to apply, and configure them to match your preferences.

Use GUI or CLI

Faux Pas has both a graphical user interface and a command-line interface.

Run during Xcode builds

Invoke Faux Pas in a Run Script build phase in Xcode, and see the emitted diagnostics in Xcode’s Issue Navigator (as well as inline with the code, just like regular compiler errors).

Connect to external tools

Faux Pas can output diagnostics in JSON or Property List formats.

Process them in any way you want with custom scripts.

You can also run Faux Pas on continuous integration servers.

Configure

Select rules by tags, and exclude individual rules. Set general and rule-specific options. Save into JSON configuration files.

Open links in your favorite editor

Faux Pas can open files in several popular code editors, as well as API documentation in either Xcode or Dash.