iOS检测代码执行效率

RT

 #import <mach/mach_time.h>

 double MachTimeToSecs(uint64_t time)

 {

     mach_timebase_info_data_t timebase;

     mach_timebase_info(&timebase);

     return (double)time * (double)timebase.numer /

     (double)timebase.denom /1e9;

 }

 - (void)doSomething

 {

     uint64_t beginTime = mach_absolute_time();

     // 在这里放置你要检测效率的代码

     uint64_t endTime = mach_absolute_time();

     NSLog(@"Time taken to doSomething %g s",MachTimeToSecs(endTime - beginTime));

 }