无法在Swift 3.0中获取当前日期

Question

我使用下面的代码来获取当前日期并格式化它。 但看到错误＆＃34;无法调用initiliazer类型＆＃34;日期＆＃34;没有参数＆＃34;

    let currentDateTime = Date()
    // initialize the date formatter and set the style
    let formatter = DateFormatter()
    formatter.timeStyle = .medium
    formatter.dateStyle = .long

    // get the date time String from the date object
    formatter.string(from: currentDateTime) // October 8, 2016 at 10:48:53 PM

截图

Answer 1

您可能无法将代码放在正确的位置。确保它在某种功能内。您甚至可以将其放在viewDidLoad()内。

override func viewDidLoad() {
    super.viewDidLoad()
    let currentDateTime = Date()
    // initialize the date formatter and set the style
    let formatter = DateFormatter()
    formatter.timeStyle = .medium
    formatter.dateStyle = .long

    // get the date time String from the date object
    let mytime = formatter.string(from: currentDateTime) // October 8, 2016 at 10:48:53 PM
    print(mytime) 
 }    

func getcurrentDate() {
    let currentDateTime = Date()
    // initialize the date formatter and set the style
    let formatter = DateFormatter()
    formatter.timeStyle = .medium
    formatter.dateStyle = .long

    // get the date time String from the date object
    let mytime = formatter.string(from: currentDateTime) // October 8, 2016 at 10:48:53 PM
    print(mytime)
}

Answer 2

我建议你使用这种方法来格式化样式（Swift 3）：

formatter.dateStyle = DateFormatter.Style.full
formatter.timeStyle = DateFormatter.Style.long

在这种情况下，日期为您的语言环境的字符串：

let currentDate = Date()
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "----your locale here----")
formatter.dateStyle = DateFormatter.Style.full
let myDate = todayFormatter.string(from: currentDate)
print(myDate) 

Answer 3

swift 4

==> Getting iOS device current time:-

let hh1 = Calendar.current.component(.hour, from: Date())
let mm1 = Calendar.current.component(.minute, from: Date())
let ss1 = Calendar.current.component(.second, from: Date())

print(hh1, ":", mm1, ":", ss1)

output: ---> 11 : 10: 25