增加NSDate+1天方法Objective-C？

发布于 2024-11-09 07:00:25 字数 504 浏览 0 评论 0原文

这是我用来在导航栏中增加一天并将该天的名称设置为标题的方法。我知道这是错误的，因为我每次调用时都设置“今天”变量。但我不知道如何在每次调用此方法时增加+1天。

-(void)stepToNextDay:(id)sender
{
    today = [NSDate date];
    NSDate *datePlusOneDay = [today dateByAddibgTimeInterval:(60 * 60 * 24)];
    NSDateFormatter *dateformatterBehaviour = [[[NSDateFormatter alloc]init]autorelease];
    [dateFormatter setDateFormat:@"EEEE"];
    NSString *dateString = [dateFormatter stringFromDate:datePlusOneDay];
    self.navigationItem.title = datestring;
}

原文

This is my method I use for increasing by one day in my navigationBar, and setting the name of the day as a title. I know it's wrong because I set "today" variable every time its called. But I can't figure out how to increase +1 day every time I call this method.

-(void)stepToNextDay:(id)sender
{
    today = [NSDate date];
    NSDate *datePlusOneDay = [today dateByAddibgTimeInterval:(60 * 60 * 24)];
    NSDateFormatter *dateformatterBehaviour = [[[NSDateFormatter alloc]init]autorelease];
    [dateFormatter setDateFormat:@"EEEE"];
    NSString *dateString = [dateFormatter stringFromDate:datePlusOneDay];
    self.navigationItem.title = datestring;
}

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孤独岁月 2024-11-16 07:00:25

将您显示的日期存储在视图控制器的属性（ivar，...）中。这样您就可以在第二天时检索当前设置。

如果您想可靠地添加日期，请使用 NSCalendar 和 NSDateComponents 获取“1 天”单位，并将其添加到当前日期。

NSCalendar*       calendar = [[[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar] autorelease];
NSDateComponents* components = [[[NSDateComponents alloc] init] autorelease];
components.day = 1;
NSDate* newDate = [calendar dateByAddingComponents: components toDate: self.date options: 0];

Store the date your are showing in a property (ivar, ...) of your view controller. That way you can retrieve the current setting when you go to the next day.

If you want to reliably add dates, use NSCalendar and NSDateComponents to get a "1 day" unit, and add that to the current date.

NSCalendar*       calendar = [[[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar] autorelease];
NSDateComponents* components = [[[NSDateComponents alloc] init] autorelease];
components.day = 1;
NSDate* newDate = [calendar dateByAddingComponents: components toDate: self.date options: 0];

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怀念你的温柔 2024-11-16 07:00:25

由于从 iOS 8 NSGregorianCalendar 开始，更新的答案将是，

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [[NSDateComponents alloc] init];
components.day = 1;
NSDate *newDate = [calendar dateByAddingComponents:components toDate:today options:0];

Swift Code:

var today:NSDate = NSDate()
let calender:NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
var components:NSDateComponents = NSDateComponents()
components.setValue(1, forComponent: NSCalendarUnit.CalendarUnitDay)
var newDate:NSDate! = calender.dateByAddingComponents(components, toDate:today, options: NSCalendarOptions(0))

As from iOS 8 NSGregorianCalendar is depricated, the updated answer will be,

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [[NSDateComponents alloc] init];
components.day = 1;
NSDate *newDate = [calendar dateByAddingComponents:components toDate:today options:0];

Swift Code:

var today:NSDate = NSDate()
let calender:NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
var components:NSDateComponents = NSDateComponents()
components.setValue(1, forComponent: NSCalendarUnit.CalendarUnitDay)
var newDate:NSDate! = calender.dateByAddingComponents(components, toDate:today, options: NSCalendarOptions(0))

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