Multiple Closures with Trailing Closure

Trailing closure syntax should not be used when passing more than one closure argument

  • Identifier: multiple_closures_with_trailing_closure
  • Enabled by default: Yes
  • Supports autocorrection: No
  • Kind: style
  • Analyzer rule: No
  • Minimum Swift compiler version: 5.0.0
  • Default configuration:
    KeyValue
    severity warning

Non Triggering Examples

foo.map { $0 + 1 }

foo.reduce(0) { $0 + $1 }

if let foo = bar.map({ $0 + 1 }) {

}

foo.something(param1: { $0 }, param2: { $0 + 1 })

UIView.animate(withDuration: 1.0) {
    someView.alpha = 0.0
}

foo.method { print(0) } arg2: { print(1) }

foo.methodWithParenArgs((0, 1), arg2: (0, 1, 2)) { $0 } arg4: { $0 }

Triggering Examples

foo.something(param1: { $0 }) ↓{ $0 + 1 }

UIView.animate(withDuration: 1.0, animations: {
    someView.alpha = 0.0
}) ↓{ _ in
    someView.removeFromSuperview()
}

foo.multipleTrailing(arg1: { $0 }) { $0 } arg3: { $0 }

foo.methodWithParenArgs(param1: { $0 }, param2: (0, 1), (0, 1)) { $0 }