nstimeinterval如何用NSdate 的到24小时制时间

nstimeinterval 时间:2021-05-27 阅读:()

timeintervalsince1970 是秒还是毫秒 ios

已经解决了。

NSTimeInterval本身是个秒级别的double类型数值，小数点后面即毫秒数,*1000.0f即可得到毫秒级别的时间差//为了兼容java版本，事件是从1970/1/1开始-(NSDate *)getDateTimeFromMilliSeconds:(long long) miliSeconds{ NSTimeInterval tempMilli = miliSeconds; NSTimeInterval seconds = tempMilli/1000.0; NSLog(@"seconds=%f",seconds); return [NSDate dateWithTimeIntervalSince1970:seconds];}//将NSDate类型的时间转换为NSInteger类型,从1970/1/1开始-(long long)getDateTimeTOMilliSeconds:(NSDate *)datetime{ NSTimeInterval interval = [datetime timeIntervalSince1970]; NSLog(@"interval=%f",interval); long long totalMilliseconds = interval*1000 ; NSLog(@"totalMilliseconds=%llu",totalMilliseconds); return totalMilliseconds; }

int存放时间戳，什么时候会报错

那是你获取时间戳时没有注意类型转换吧？一般long time = new Date().getTime(); 这个方法返回的是long类型，你用int接肯定会报错的啊你看是不是这样子

判断日期是今天，昨天还是明天

[代码分享]判断日期是今天，昨天还是明天 -(NSString *pareDate:(NSDate *)date{ NSTimeInterval secondsPerDay = 24 * 60 * 60; NSDate *today = [[NSDate alloc] init]; NSDate *tomorrow, *yesterday; tomorrow = [today dateByAddingTimeInterval: secondsPerDay]; yesterday = [today dateByAddingTimeInterval: -secondsPerDay]; // 10 first characters of description is the calendar date: NSString * todayString = [[today description] substringToIndex:10]; NSString * yesterdayString = [[yesterday description] substringToIndex:10]; NSString * tomorrowString = [[tomorrow description] substringToIndex:10]; NSString * dateString = [[date description] substringToIndex:10]; if ([dateString isEqualToString:todayString]) { return @"今天"; } else if ([dateString isEqualToString:yesterdayString]) { return @"昨天"; }else if ([dateString isEqualToString:tomorrowString]) { return @"明天"; } else { return dateString; } }

有没有改变scrollRectToVisible速度的方法？

没有公共函数。

周期固定在0.3秒。

这里有一个未公开的 API改变周期：@interface UIScrollView(UIScrollViewInternal)-(void)_setContentOffsetAnimationDuration:(NSTimeInterval)duration;@end但是如果用了未公开的API，AppStore就会拒绝你的应用。

如何停止多次的 ios 中的 didUpdateLocations 方法调用

添加那里一些限制。

位置和精度之间的时间跨度 -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { CLLocation *newLocation = locations.lastObject; NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow]; if (locationAge > 5.0) return; if (uracy < 0) return; // Needed to filter cached and too old locations //NSLog(@"Location updated to = %@", newLocation); CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:_currentLocation.coordinate.latitude longitude:_currentLocation.coordinate.longitude]; CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude]; double distance = [loc1 distanceFromLocation:loc2]; _currentLocation = newLocation; if(distance > 20) { //significant location update } //location updated }