我喜欢使用扩展使代码更具可读性。以下是一些NSDate扩展，它们可以帮助清理代码并使其易于理解。我把它放在一个sharedCode.swift文件中：
extension NSDate {
func isGreaterThanDate(dateToCompare: NSDate) -> Bool {
//Declare Variables
var isGreater = false
//Compare Values
if self.compare(dateToCompare as Date) == ComparisonResult.orderedDescending {
isGreater = true
}
//Return Result
return isGreater
}
func isLessThanDate(dateToCompare: NSDate) -> Bool {
//Declare Variables
var isLess = false
//Compare Values
if self.compare(dateToCompare as Date) == ComparisonResult.orderedAscending {
isLess = true
}
//Return Result
return isLess
}
func equalToDate(dateToCompare: NSDate) -> Bool {
//Declare Variables
var isEqualTo = false
//Compare Values
if self.compare(dateToCompare as Date) == ComparisonResult.orderedSame {
isEqualTo = true
}
//Return Result
return isEqualTo
}
func addDays(daysToAdd: Int) -> NSDate {
let secondsInDays: TimeInterval = Double(daysToAdd) * 60 * 60 * 24
let dateWithDaysAdded: NSDate = self.addingTimeInterval(secondsInDays)
//Return Result
return dateWithDaysAdded
}
func addHours(hoursToAdd: Int) -> NSDate {
let secondsInHours: TimeInterval = Double(hoursToAdd) * 60 * 60
let dateWithHoursAdded: NSDate = self.addingTimeInterval(secondsInHours)
//Return Result
return dateWithHoursAdded
}
}
现在，如果您可以执行以下操作：
//Get Current Date/Time
var currentDateTime = NSDate()
//Get Reminder Date (which is Due date minus 7 days lets say)
var reminderDate = dueDate.addDays(-7)
//Check if reminderDate is Greater than Right Now
if(reminderDate.isGreaterThanDate(currentDateTime)) {
//Do Something...
}
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