swift 4中的错误

Question

这是我的快速代码：

while ((mutatedString.range(of: "-")?.lowerBound) != nil) {
        if let range = mutatedString.range(of: "-") {
        let caseString = mutatedString.substring(with: range)
        let caseString = mutatedString.substring(with: <#T##String.CharacterView corresponding to your index##String.CharacterView#>.index(range.lowerBound, offsetBy: 1)..<.index(range.upperBound, offsetBy: 1))
                    mutatedString = mutatedString.replacingCharacters(in: range.lowerBound..<<#T##String.CharacterView corresponding to your index##String.CharacterView#>.index(range.upperBound, offsetBy: 1), with: caseString.uppercased())
                }
            }

占位符编辑器错误.. 谢谢。

Answer 1

<#T##String.CharacterView corresponding to your index##String.CharacterView#>

是自动完成的编辑器占位符。你应该用变量替换它