如何通过使用两个不同的日期选择器找到两个日期之间的差异

Question

我做了一个代码来使用两个不同的日期选择器找到两个日期之间的差异。我无法找到两个日期之间的差异。两个日期的差别总是为零。

@property (strong, nonatomic) IBOutlet UILabel *date1; 
@property (strong, nonatomic) IBOutlet UILabel *date2; 
- (IBAction)cale1:(id)sender; 
- (IBAction)cale2:(id)sender; 
@property (strong, nonatomic) IBOutlet UIDatePicker *datePicker1; 
@property (strong, nonatomic) IBOutlet UIDatePicker *datePicker2; 
@property NSDate *d1,*d2; 

@implementation ViewController 

- (IBAction)cale1:(id)sender { 
    NSDateFormatter *dc=[[NSDateFormatter alloc]init]; 
    dc.dateStyle=NSDateFormatterFullStyle; 
    _d1=_datePicker1.date; 
    _date1.text=[dc stringFromDate:_datePicker1.date]; 
    NSLog(@"Date %@",_date1); 
} 

- (IBAction)cale2:(id)sender { 
    NSDateFormatter *dc=[[NSDateFormatter alloc]init]; 
    dc.dateStyle=NSDateFormatterFullStyle; 
    _d2=_datePicker2.date; 
    _date2.text=[dc stringFromDate:_datePicker2.date]; 
    NSLog(@"Date %@",_d2); 

    [self isSameDay:_d1 otherDay:_d2]; 

} 
-(BOOL)isSameDay:(NSDate *)date1 otherDay:(NSDate *)date2{ 
    NSCalendar *cale=[NSCalendar currentCalendar]; 
    unsigned unitFlags=NSYearCalendarUnit| NSMonthCalendarUnit| NSDayCalendarUnit; 
    NSDateComponents *comp1=[cale components:unitFlags fromDate:date1]; 
    NSDateComponents *comp2=[cale components:unitFlags fromDate:date2]; 


    // NSString *comp=[NSString stringWithFormat:@"%d", [comp1 day]==[comp2 day]&&[comp1 month]==[comp2 month]&&[comp1 year]==[comp2 year]]; 
    BOOL a=[comp1 day]==[comp2 day]&&[comp1 month]==[comp2 month]&&[comp1 year]==[comp2 year]; 

    NSLog(@"Date Differ%hhd",a); 
    return a; 
} 

Answer 1

比较方法有效日期中的日期是？

如果他们是你可以这样做：如果日期是不一样的

BOOL difference = [date1 timeIntervalSinceDate:date2] > 0; 

差异将是真实的。 timeIntervalSinceDate返回NSTimeInterval这是：

用于指定时间间隔，以秒为单位。

Answer 2

为了比较两个日期，你需要使用NSDateComponents.I修改你的函数“isSameDay”。它返回两个日期之间的日差数。

-(int)isSameDay:(NSDate *)date1 otherDay:(NSDate *)date2 
{  
    NSDateComponents *components; 

    int days; 

    components = [[NSCalendar currentCalendar] components: NSDayCalendarUnit 
              fromDate: date1 toDate: date2 options: 0]; 
    days = (int) [components day]; 

    NSLog(@"days %d",abs(days)); 

    return days; 

}