Question

我有这个用swift写的应用程序，我分别得到一个未来的日期和未来的小时（作为Unix时间戳），我想把它们变成一个Date（）对象，这样我就可以转换为Unix时间戳。

如果您现在另一种直接转换为Unix时间戳的方式可以随意发布。

Answer 1

这可能会为您提供有关如何实现目标的一些想法：

let calendar = Calendar.current
let currentDate = Date()

// Random future date, 1 month from now
let futureDate = calendar.date(byAdding: .month, value: 1, to: currentDate)!
let futureDateComponents = calendar.dateComponents([.year, .month, .day], from: futureDate)

// Random hour
let futureHour = 2

// Use your future date and your future hour to set the components for the new date to be created
var newDateComponents = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: currentDate)
newDateComponents.year = futureDateComponents.year
newDateComponents.month = futureDateComponents.month
newDateComponents.day = futureDateComponents.day
newDateComponents.hour = futureHour
newDateComponents.minute = 0
newDateComponents.second = 0

// Create a new date from components
let newDate = calendar.date(from: newDateComponents)!

// Convert new date to unix time format
let unixTime = newDate.timeIntervalSince1970

print(newDate) // 2018-03-06 02:00:00 +0000
print(unixTime) // 1520301600.0

请注意，在实际项目中，您应该避免强行展开（即使用'！'）。

Answer 2

如果您的日期字符串格式为dd-MM-yyyy，则可以将其转换为Date对象，如下所示：

let string = "02-06-2018"

let formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy"
formatter.locale = Locale(identifier: "en_US_POSIX")   // this is only needed if string is always gregorian but you don't know what locale the device is using
guard let date = formatter.date(from: string) else {
    // handle error however you'd like
    return
}

或者，如果您已有Date个对象，则不需要上述内容。但是，无论如何，只要您拥有Date，就可以通过设置小时，分钟和秒来获得Date，如下所示：

let hour = 14  // 2pm
guard let result = Calendar.current.date(bySettingHour: hour, minute: 0, second: 0, of: date) else { 
    // handle error however you'd like
    return
}

连接分隔的日期和小时以创建单个Date（）对象

2 个答案: