ios - 如何在 Swift 4 中将 Any 转换为 Date？

Question

我从服务器收到一个日期:

// It comes from server as Any let.
let userInfo: [AnyHashable : Any]

let userInfoDic = userInfo as NSDictionary
userInfoDic.value(forKey: "gcm.notification.date") as Any

// prints Optional(2018-04-26)

如果我尝试转换为日期，则会抛出错误:

‘Any?’ is not convertible to 'Date'; did you mean to use 'as!' to force downcast?

当我强制执行时，返回一个 fatal error 。

Answer 1

试试这个:

if let dateString = userInfoDic.value(forKey: "gcm.notification.date") as? String {
    let dateFormatter = DateFormatter()
    dateFormatter.format = "yyyy-MM-dd"
    if let date = dateFormatter.date(from: dateString) {
        print(date)
    }
}