如果是，则检查字符串的日期格式是否符合要求的格式

Question

我在Java中问过同样的问题here， 它有可能在swift？

func stringToDate(str: String) -> Date{

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd/MM/yyyy"

    //check validation of str 

    return date
}

Answer 1

与Java一样，检查它是否可以正确解析

let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd hh:mm:ss"
let someDate = "string date"

if dateFormatterGet.date(from: someDate!) != nil {

} else {
    // invalid format
}

Answer 2

对于Swift 4，语法有所改变：

 func isValidDate(dateString: String) -> Bool {
    let dateFormatterGet = DateFormatter()
    dateFormatterGet.dateFormat = "yyyy-MM-dd hh:mm:ss"
    if let _ = dateFormatterGet.date(from: dateString) {
        //date parsing succeeded, if you need to do additional logic, replace _ with some variable name i.e date
        return true
    } else {
        // Invalid date
        return false
    }
}

Answer 3

在swift3中：

func stringToDate(str: String) -> Date{

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd/MM/yyyy"

    guard let date = dateFormatter.date(from: str){
        return Date()
    }

    return date

}

Answer 4

雨燕5

let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd hh:mm:ss"
let someDate = "string date"

if dateFormatterGet.date(from: someDate!) != nil {

} else {
    // invalid format
}