的NSDate從一個日期組件和從其他的NSDate

Question

時間部分我在我的應用的兩所的UIDatePicker控制，配置了UIDatePickerModeDate一個又一個與UIDatePickerModeTime。

我希望配置的NSDate對象從一個的UIDatePicker的日期和從第二個時間......怎麼樣？

謝謝， 馬克

Answer 1

假定日期1和date2是你的兩個NSDate的值。 date1包含您的日期組件，date2包含您的時間組件。這裏是你如何將它們組合在一起：

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! 

對於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! 

Answer 2

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]; 

Answer 3

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)