用
localtime替代NSDateFormatter来完成NSDate到NSString的转换
- 测量代码
- (void)testDateFormatter {
NSDate *date = [NSDate date];
uint64_t t1 = dispatch_benchmark(10000, ^{
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
NSString *dateString = [fmt stringFromDate:date];
//NSLog(@"%@", dateString);
});
uint64_t t2 = dispatch_benchmark(10000, ^{
time_t timeInterval = [date timeIntervalSince1970];
struct tm *cTime = localtime(&timeInterval);
NSString *dateString = [NSString stringWithFormat:@"%d-%02d-%02d",cTime->tm_year+1900,
cTime->tm_mon+1,cTime->tm_mday];
//NSLog(@"%@", dateString);
});
NSLog(@"t1:%llu, t2:%llu", t1, t2);
}
- 输出
t1:65482, t2:17860
t1:64783, t2:16978
t1:64048, t2:16813
t1:63576, t2:18177
t1:63270, t2:16066
-
localtime与NSDateFormatter相比较性能方面有大约73%左右的提升。
