iphone - 如何使用 NSDate 获得下一个日期？

Question

可能重复：
iOS 和找到 Tomorrow

我如何使用 NSDate 获得下一个日期。请把解决方案发给我。

Answer 1

下面，yourDate 代表你输入的 NSDate；nextDate 表示第二天。

// start by retrieving day, weekday, month and year components for yourDate
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *todayComponents = [gregorian components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:yourDate];
    NSInteger theDay = [todayComponents day];
    NSInteger theMonth = [todayComponents month];
    NSInteger theYear = [todayComponents year];

    // now build a NSDate object for yourDate using these components
    NSDateComponents *components = [[NSDateComponents alloc] init];
    [components setDay:theDay]; 
    [components setMonth:theMonth]; 
    [components setYear:theYear];
    NSDate *thisDate = [gregorian dateFromComponents:components];
    [components release];

    // now build a NSDate object for the next day
    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
    [offsetComponents setDay:1];
    NSDate *nextDate = [gregorian dateByAddingComponents:offsetComponents toDate:thisDate options:0];
    [offsetComponents release];
    [gregorian release];

Answer 2

NSDate *tomorrow = [NSDate dateWithTimeInterval:(24*60*60) sinceDate:[NSDate date]];

更简单的方法..

Answer 3

这个方法怎么样？

http://www.drobnik.com/touch/2009/05/adding-days-to-nsdate/

NSDate *now = [NSDate date];
int daysToAdd = 50;  // or 60 :-)

// set up date components
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
[components setDay:daysToAdd];

// create a calendar
NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

NSDate *newDate2 = [gregorian dateByAddingComponents:components toDate:now options:0];
NSLog(@"Clean: %@", newDate2);

Answer 4

我想这种方法对我来说效果很好。

NSString *zajtra = [[NSDate date] dateByAddingTimeInterval:86400];

Answer 5

//将以下代码添加到init方法或viewDidload

[[NSUserDefaults standardUserDefaults] setObject:[NSDate date]  forKey:@"Date"];

//将此代码添加到您要检索下一个或上一个日期的位置

NSDate *tomorrow = [[NSUserDefaults standardUserDefaults] valueForKey:@"Date"];
NSTimeInterval secondsPerDay = 24 * 60 * 60;    
NSDate *date = [tomorrow addTimeInterval:secondsPerDay]; //Change NSDate *date = [tomorrow addTimeInterval:-secondsPerDay]; for yesterday
tomorrow = date;
[self setDate:tomorrow];
dateTextField.text = [self getDate];        
[[NSUserDefaults standardUserDefaults] setObject:tomorrow  forKey:@"Date"];