无法强制解包非可选类型的值 'String'

Question

if let cityDetailsPath = Bundle.main.path(forResource: "Places", ofType: "plist") {
            if let cityDetails = NSArray(contentsOfFile: cityDetailsPath!) as? [[String: String]]
            {
                    for city in cityDetails

我的行有错误：

if let cityDetails = NSArray(contentsOfFile: cityDetailsPath!) as? [[String: String]]

错误：

Cannot force unwrap value of non-optional type 'String'

Answer 1

删除强制展开符号!。

if let cityDetailsPath = Bundle.main.path(forResource: "Places", ofType: "plist") {
        if let cityDetails = NSArray(contentsOfFile: cityDetailsPath) as? [[String: String]]
        {
            for city in cityDetails {

            }
        }
    }