Default SwiftLint repo-wide configuration file. Put this at the root directory of your repository and tweak for your needs.

.swiftlint.yml

# Turn off default SwiftLint rules
disabled_rules:
  - trailing_whitespace # Disables SwiftLint complaining about whitespace characters on empty lines
  - todo # Disables auto-warning of TODO statements

# Turn on extra SwiftLint rules
opt_in_rules:
  - array_init
  - attributes
  - closure_end_indentation
  - closure_spacing
  - contains_over_first_not_nil
  - convenience_type
  - discouraged_optional_boolean
  - discouraged_optional_collection
  - empty_count
  - empty_string
  - empty_xctest_method
  - explicit_init
  - fallthrough
  - fatal_error_message
  - file_header
  - file_name
  - first_where
  - force_unwrapping
  - function_default_parameter_at_end
  - implicit_return
  - implicitly_unwrapped_optional
  - joined_default_parameter
  - let_var_whitespace
  - literal_expression_end_indentation
  - modifier_order
  - multiline_arguments
  - multiline_function_chains
  - multiline_parameters
  - number_separator
  - object_literal
  - operator_usage_whitespace
  - overridden_super_call
  - override_in_extension
  - pattern_matching_keywords
  - private_action
  - private_outlet
  - prohibited_super_call
  - redundant_nil_coalescing
  - required_enum_case
  - single_test_class
  - sorted_first_last
  - sorted_imports
  - strict_fileprivate
  - switch_case_on_newline
  - trailing_closure
  - unavailable_function
  - unneeded_parentheses_in_closure_argument
  - unowned_variable_capture
  - untyped_error_in_catch
  - vertical_parameter_alignment_on_call
  - yoda_condition

# Omit directories from SwiftLint checks
excluded:
  - Pods # Don't lint anything coming in through Cocoapods

# Custom rules
custom_rules:
  # Warns for usage of improper year format (e.g. MM/dd/YYYY instead of MM/dd/yyyy)
  YYYY_considered_harmful: # rule identifier
    name: "YYYY considered harmful" # rule name. optional.
    regex: "(YYYY)" # matching pattern
    message: "YYYY means week-year; you probably want yyyy" # violation message. optional.
    severity: error # violation severity. optional.

# Rule configuration
line_length: 240 # Max line length before warning (default is 120)
identifier_name:
  max_length:
    warning: 50
    error: 60
  excluded:
    - id