.Contains 闭包：'Bool' is ambiguous without more context [解决方案：可选字符串问题]

Question

使用此，我尝试进行不区分大小写的搜索以查找某个专业的公司，但我在 let isFound = 处收到错误 "Expression 'Bool' is ambiguous without more context"。

为什么？我该如何解决？

company.majors 是一个 String 数组。 searchValue 是小写 String

let searchValue = filterOptItem.searchValue?.lowercased()
for company in allCompanies {
     //Insensitive case search
     let isFound = company.majors.contains({ [=11=].caseInsensitiveCompare(searchValue) == ComparisonResult.orderedSame })
     if (isFound) {
        filteredCompanies.insert(company)
     }
}

Answer 1

SearchValue 是可选字符串。

如果您确定searchValue 不能为nil。请使用：

let isFound = company.majors.contains({ [=10=].caseInsensitiveCompare(searchValue!) == ComparisonResult.orderedSame })

如果您不确定，请使用：

if let searchValue = filterOptItem.searchValue?.lowercased(){
    for company in allCompanies {
         //Insensitive case search
         let isFound = company.majors.contains({ [=11=].caseInsensitiveCompare(searchValue) == ComparisonResult.orderedSame })
         if (isFound) {
            filteredCompanies.insert(company)
         }
    }
}

Answer 2

很大程度上取决于上下文和可能的扩展，但是 cod 本身似乎是错误的：您应该隐式闭包 let isFound = company.majors.contains{ [=11=].caseInsensitiveCompare(searchValue) == ComparisonResult.orderedSame } 或使用参数名称 where:.

修复了适用于 Swift4 游乐场的代码：

let company = (name: "Name", majors: ["a", "b", "cas"])
let searchValue = "a"
let isFound = company.majors.contains{ [=10=].caseInsensitiveCompare(searchValue) == ComparisonResult.orderedSame }

Answer 3

Swift 5 , Swift 4

//MARK:- You will find the array when its filter in "filteredStrings" variable you can check it by count if count > 0 its means you have find the results

let itemsArray = ["Google", "Goodbye", "Go", "Hello"]
let searchToSearch = "go"

    let filteredStrings = itemsArray.filter({(item: String) -> Bool in

        let stringMatch = item.lowercased().range(of: searchToSearch.lowercased())
        return stringMatch != nil ? true : false
    })
    print(filteredStrings)


    if (filteredStrings as NSArray).count > 0
    {
        //Record found
    }
    else
    {
        //Record Not found
    }

.Contains 闭包：'Bool' is ambiguous without more context [解决方案：可选字符串问题]

.Contains closure: 'Bool' is ambiguous without more context [Solution: Optional String issue]

arrays

closures

contains

ios

swift