iPhone 获取指定格式的时间和日期
文章由LinuxBoy分享于2019-03-31 06:03:52
iPhone 获取指定格式的时间和日期
1. 显示当前的年月日+时间
- NSDate* date = [NSDate date];
- NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];
- [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
-
- NSString* timeStr = [formatter stringFromDate:date];
2. 只显示当前的日期格式
- NSDate* date = [NSDate date];
- NSDateFormatter* formatter = [[[NSDateFormatter alloc] init] autorelease];
- [formatter setDateFormat:@"yyyy-MM-dd"];
-
- NSString* timerStr = [formatter stringFromDate:date];
3. 获取某段时间差,可以精确到微秒级别, 用于计算代码执行效率
-
- uint64_t start = clock();
- [_image drawInRect:CGRectMake(0, 0, 400, 300)];
- uint64_t end = clock();
- uint64_t drawTime = end - start;
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