我有一个日期选择器,我想只有一行有3个选项:当天,前一天和前一天。
你能帮我这么做吗?
我的问题是,如何在一天后和前一天添加“当天”?
答案 0 :(得分:5)
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:days];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *end = [gregorian dateByAddingComponents:components toDate:[NSDate date] options:0];
其中days是一个整数,表示您想要从当天加/减的天数。
答案 1 :(得分:1)
这就是我的做法 -
-(void)getDate{
NSString *str_CurDate =[self getCurrentDate];
NSString *str_NextDay =[self getFormattedDate:[self dateByAddingDays:1]];
NSString *str_PrevDay =[self getFormattedDate:[self dateByAddingDays:-1]];
}
现在实现这些方法
-(NSString*)getCurrentDate{
NSDate *currDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"d/M/yyyy"];
NSString *dateString = [dateFormatter stringFromDate:currDate];
return dateString;
}
- (NSDate *) dateByAddingDays:(int)days {
NSDate *retVal;
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:days];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
retVal= [gregorian dateByAddingComponents:components toDate:[NSDate date] options:0];
return retVal;
}
-(NSString*)getFormattedDate:(NSDate*)myDate{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"d/M/yyyy"];
NSString *dateString = [dateFormatter stringFromDate:myDate];
return dateString;
}
答案 2 :(得分:0)
封装在NSDate
- (NSDate *) dateByAddingDays:(int)days {
NSDate *retVal;
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:days];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
retVal = [gregorian dateByAddingComponents:components toDate:self options:0];
return retVal;
}