要从NSDateComponents获取正确的秒数,您需要首先将NSDateComponents转换为NSDate,然后使用NSCalendar方法计算两个日期之间的差值。以下是一个简单的示例,展示了如何执行此操作:
import Foundation
func dateFromComponents(components: NSDateComponents) -> NSDate? {
let calendar = NSCalendar.currentCalendar()
return calendar.dateFromComponents(components)
}
func secondsBetweenDates(date1: NSDate, date2: NSDate) -> Int {
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.Second, fromDate: date1, toDate: date2, options: [])
return components.second
}
let startComponents = NSDateComponents()
startComponents.year = 2021
startComponents.month = 1
startComponents.day = 1
startComponents.hour = 0
startComponents.minute = 0
startComponents.second = 0
let endComponents = NSDateComponents()
endComponents.year = 2021
endComponents.month = 1
endComponents.day = 1
endComponents.hour = 0
endComponents.minute = 1
endComponents.second = 30
if let startDate = dateFromComponents(startComponents), let endDate = dateFromComponents(endComponents) {
let seconds = secondsBetweenDates(startDate, endDate)
print("秒数差:\(seconds)")
} else {
print("无法计算秒数")
}
这个示例将输出以下结果:
秒数差:90
这是一个简单的方法,用于计算NSDateComponents对象之间的秒数。请注意,这个方法仅适用于同一时区的日期。如果您需要处理不同时区的日期,您需要对代码进行相应的调整。
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