ios NSDate 具有来自一个 NSDate 的日期组件和来自另一个 NSDate 的时间组件

NSDate with date component from one and time component from another NSDate

提问by Cornelius

I have two UIDatePicker controls in my app, one configured with UIDatePickerModeDate and one with UIDatePickerModeTime.

我的应用中有两个 UIDatePicker 控件，一个配置了 UIDatePickerModeDate，一个配置了 UIDatePickerModeTime。

I want to configure a NSDate object with the date from UIDatePicker one and the time from the second one ... how?

我想用 UIDatePicker 第一个的日期和第二个的时间配置一个 NSDate 对象......如何？

Thanks, Mark

谢谢，马克

回答by melsam

Assume date1 and date2 are your two NSDate values. date1 contains your date components and date2 contains your time components. Here's how you would combine them together:

假设 date1 和 date2 是您的两个 NSDate 值。date1 包含您的日期组件，而 date2 包含您的时间组件。以下是将它们组合在一起的方法：

NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

// Extract date components into components1
NSDateComponents *components1 = [gregorianCalendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
                                                     fromDate:date1];

// Extract time components into components2
NSDateComponents *components2 = [gregorianCalendar components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit 
                                                     fromDate:date2];

// Combine date and time into components3
NSDateComponents *components3 = [[NSDateComponents alloc] init];

[components3 setYear:components1.year];
[components3 setMonth:components1.month];
[components3 setDay:components1.day];    

[components3 setHour:components2.hour];
[components3 setMinute:components2.minute];
[components3 setSecond:components2.second];         

// Generate a new NSDate from components3.
NSDate *combinedDate = [gregorianCalendar dateFromComponents:components3];   

// combinedDate contains both your date and time!

For iOS 8.0 +

适用于 iOS 8.0 +

NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

// Extract date components into components1
NSDateComponents *components1 = [gregorianCalendar components:(NSCalendarUnit)(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
                                                     fromDate:date1];

// Extract time components into components2
NSDateComponents *components2 = [gregorianCalendar components:(NSCalendarUnit)(NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond)
                                                     fromDate:date2];

// Combine date and time into components3
NSDateComponents *components3 = [[NSDateComponents alloc] init];

[components3 setYear:components1.year];
[components3 setMonth:components1.month];
[components3 setDay:components1.day];

[components3 setHour:components2.hour];
[components3 setMinute:components2.minute];
[components3 setSecond:components2.second];

// Generate a new NSDate from components3.
NSDate * combinedDate = [gregorianCalendar dateFromComponents:components3];

// combinedDate contains both your date and time!

回答by Natividad Lara Diaz

In Swift:

在斯威夫特：

let calendar = NSCalendar.currentCalendar()
let date1 = NSDate() // PickerDateMode
let date2 = NSDate() // PickerHourMode

let componentsOne = calendar.components([.Year, .Month, .Day], fromDate: date1)
let componentsTwo = calendar.components([.Hour, .Minute], fromDate: date2)   

let totalComponents = NSDateComponents()
totalComponents.year = componentsOne.year
totalComponents.month = componentsOne.month
totalComponents.day = componentsOne.day
totalComponents.hour = componentsTwo.hour
totalComponents.minute = componentsTwo.minute

let finalDate = calendar.dateFromComponents(totalComponents)

回答by iKushal

NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDate *date = [NSDate date];//datapicker date
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:date];

NSInteger year = [dateComponents year];
NSInteger month = [dateComponents month];
NSInteger day = [dateComponents day];
NSInteger hour = [dateComponents hour];
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];

回答by Harjot Singh

Update to Swift 4 and 4.1

更新到 Swift 4 和 4.1

 func combineDateAndTimeToOneDate() {

    let datefrmter = DateFormatter()
     datefrmter.dateFormat = "dd/MM/yyyy"
    let dateFromString = datefrmter.date(from: lblDate.text!)

    datefrmter.dateFormat = "h:mm a"
    let timeFromString = datefrmter.date(from: lblTime.text!)

    let calendar = NSCalendar.current

    let componentsOne = calendar.dateComponents([.year,.month,.day], from: dateFromString!)
    let componentsTwo = calendar.dateComponents([.hour,.minute,.second,.nanosecond], from: timeFromString!)

    let totalComponents = NSDateComponents()
    totalComponents.year = componentsOne.year!
    totalComponents.month = componentsOne.month!
    totalComponents.day = componentsOne.day!
    totalComponents.hour = componentsTwo.hour!
    totalComponents.minute = componentsTwo.minute!
    totalComponents.second = componentsTwo.second!
    totalComponents.nanosecond = componentsTwo.nanosecond!

    let finalDate = calendar.date(from: totalComponents as DateComponents)
    print(finalDate)

}

Hope it helps!

希望能帮助到你！