iOS 检测代码执行效率

首先导入#import
然后封装方法

• (CGFloat)CodeRunTime:(void (^)())CodeBlock{

  mach_timebase_info_data_t timebase;
  mach_timebase_info(&timebase);

  uint64_t startTime = mach_absolute_time();
  //要执行的代码块
  CodeBlock();
  uint64_t endTime = mach_absolute_time();

  uint64_t less = endTime-startTime;

  uint64_t nan = (double)less * (double)timebase.numer/(double)timebase.denom;

  return (CGFloat)nan/NSEC_PER_SEC;

}