获得当前系统时间毫秒的最佳方法是什么?
当前回答
It may be useful to know about CodeTimestamps, which provide a wrapper around mach-based timing functions. This gives you nanosecond-resolution timing data - 1000000x more precise than milliseconds. Yes, a million times more precise. (The prefixes are milli, micro, nano, each 1000x more precise than the last.) Even if you don't need CodeTimestamps, check out the code (it's open source) to see how they use mach to get the timing data. This would be useful when you need more precision and want a faster method call than the NSDate approach.
http://eng.pulse.me/line-by-line-speed-analysis-for-ios-apps/
其他回答
// Timestamp after converting to milliseconds.
NSString * timeInMS = [NSString stringWithFormat:@"%lld", [@(floor([date timeIntervalSince1970] * 1000)) longLongValue]];
这是我给斯威夫特用的
var date = NSDate()
let currentTime = Int64(date.timeIntervalSince1970 * 1000)
print("Time in milliseconds is \(currentTime)")
使用本网站验证准确性http://currentmillis.com/
let timeInMiliSecDate = Date()
let timeInMiliSec = Int (timeInMiliSecDate.timeIntervalSince1970 * 1000)
print(timeInMiliSec)
到目前为止,我发现gettimeofday在iOS (iPad)上是一个很好的解决方案,当你想执行一些间隔评估(比如帧速率,渲染帧的计时……):
#include <sys/time.h>
struct timeval time;
gettimeofday(&time, NULL);
long millis = (time.tv_sec * 1000) + (time.tv_usec / 1000);
NSTimeInterval time = ([[NSDate date] timeIntervalSince1970]); //double
long digits = (long)time; //first 10 digits
int decimalDigits = (int)(fmod(time, 1) * 1000); //3 missing digits
/*** long ***/
long timestamp = (digits * 1000) + decimalDigits;
/*** string ***/
NSString *timestampString = [NSString stringWithFormat:@"%ld%03d",digits ,decimalDigits];
推荐文章
- 前一个月的Python日期
- 如何使用Xcode创建。ipa文件?
- 动态改变UILabel的字体大小
- Xcode 4 -在新的Macintosh安装上的配置文件上“没有找到有效的签名标识”错误
- 在iPhone上确定用户是否启用了推送通知
- 是否有可能禁用浮动头在UITableView与UITableViewStylePlain?
- 错误ITMS-9000:“冗余二进制文件上传。火车1.0版本已经有一个二进制版本上传。
- Swift -转换为绝对值
- 从父iOS访问容器视图控制器
- 自定义dealloc和ARC (Objective-C)
- 调整UITableView的大小以适应内容
- 在代码中为UIButton设置一个图像
- NSRange从Swift Range?
- UICollectionView中的单元格间距
- 我如何在我的iOS应用程序中每n分钟得到一个后台位置更新?