关于iOS 计算起始时间和终止时间的差
简单的就是说 a = 终止 - 起始
求大神 帮忙解答,
求代码演示;
我是这样算的
(void)viewDidAppear:(BOOL)animated
{
NSDateFormatter *formatter =[[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd-HH-mm-ss"];
self.currentTime = [formatter stringFromDate:[NSDate date]];
NSLog(@"DATE = %@", [NSDate date]);
NSLog(@"ooooo%@", self.currentTime);
}
(void)viewWillDisappear:(BOOL)animated { NSDateFormatter *date=[[NSDateFormatter alloc] init]; [date setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSString *currentEndTime = [date stringFromDate:[NSDate date]]; NSCalendar *cal=[NSCalendar currentCalendar]; unsigned int unitFlags= NSYearCalendarUnit| NSMonthCalendarUnit| NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit; NSDateComponents *d = [cal components:unitFlags fromDate:self.currentTime toDate:currentEndTime options:0]; NSLog(@"%d天%d小时%d分钟%d秒",[d day],[d hour],[d minute],[d second]);
}打印
015-04-27 13:47:36.082 H_J_4[30420:576015] -[__NSCFString timeIntervalSinceReferenceDate]: unrecognized selector sent to instance 0x7fd6c144ebd0
(lldb)
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ios计算时间差 转
//模拟windows下 GetTickCount // //#import (int)mxGetTickCount; { int timeTick; mach_timebase_info_data_t info; uint64_t machineTime; mach_timebase_info(&info); machineTime =mach_absolute_time(); timeTick = machineTime * info.numer / info.denom /1000000LL; return timeTick; } // NSDate timeIntervalSinceDate: //下面转换NSString，用在保存时间时使用。 (double)GetStringTimeDiff:(NSString*)timeS timeE:(NSString*)timeE { double timeDiff = 0.0; NSDateFormatter *formatters = [[NSDateFormatter alloc] init]; [formatters setDateFormat:@"yyyy/MM/dd HH:mm:ss:SSS"]; NSDate *dateS = [formatters dateFromString:timeS]; NSDateFormatter *formatterE = [[NSDateFormatter alloc] init]; [formatterE setDateFormat:@"yyyy/MM/dd HH:mm:ss:SSS"]; NSDate *dateE = [formatterE dateFromString:timeE]; timeDiff = [dateE timeIntervalSinceDate:dateS ]; return timeDiff; } (NSString*)GetCurTime { NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy/MM/dd HH:mm:ss:SSS"]; NSString*timeString=[formatter stringFromDate: [NSDate date]]; [formatter release]; return timeString; }2019-07-17 19:01:56赞同 展开评论 打赏
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