PickerView计算剩余时间,主要是时间方面的转换

//计算剩余时间

-(void)getNowTimeDate:(NSString*)dateStr

{

//将传入时间NSString转化成需要的格式

NSDateFormatter
*format=[[NSDateFormatteralloc]init];

[format
setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate
*fromdate=[format
dateFromString:dateStr];

NSTimeZone
*fromzone = [NSTimeZonesystemTimeZone];

NSInteger
frominterval = [fromzone
secondsFromGMTForDate: fromdate];

NSDate
*fromDate = [fromdate
dateByAddingTimeInterval: frominterval];

NSLog(@"fromdate=%@",fromDate);

//获取当前时间

NSDate
*date = [NSDatedate];

NSTimeZone
*zone = [NSTimeZonesystemTimeZone];

NSInteger
interval = [zone
secondsFromGMTForDate: date];

NSDate
*localeDate = [date
dateByAddingTimeInterval: interval];

NSLog(@"enddate=%@",localeDate);

double
intervalTime = [fromDate
timeIntervalSinceReferenceDate] - [localeDatetimeIntervalSinceReferenceDate];

long lTime = (long)intervalTime;

NSInteger
iSeconds = lTime %
60;

NSInteger
iMinutes = (lTime /
60) %60;

NSInteger
iHours = (lTime /
3600)%24;

NSInteger
iDays = lTime/60/60/24;

NSInteger
iMonth = lTime/60/60/24/12;

NSInteger
iYears = lTime/60/60/24/384;

_surplusStr
= [NSStringstringWithFormat:@"%d年%d月%d日%.2d:%.2d:%.2d",iYears,iMonth,iDays,iHours,iMinutes,iSeconds];

}
//PickerView改变时的处理

-(void)dateChange

{
//将NSDate 转化成NSString

NSDate
* selected = [_datePickerdate];

NSDateFormatter
* dateFormatter = [[NSDateFormatteralloc]init];

[dateFormatter
setDateFormat:@"yyyy/MM/dd HH:mm:ss"];

NSString
*destDateString = [dateFormatter
stringFromDate:selected];

_dataStr
= destDateString;

[selfgetNowTimeDate:destDateString];

[_tableViewreloadData];

CGPoint
offset = [_tableViewcontentOffset];

offset.y= offset.y+PikerViewH;

_tableView.contentOffset=
offset;

_tableView.contentSize=

CGSizeMake(SCREEN_W,
offset.y+SCREEN_H);

}