获取方法的执行时间
CGFloat BNRTimeBlock (void (^block)(void)) { mach_timebase_info_data_t info; if (mach_timebase_info(&info) != KERN_SUCCESS) return -1.0; uint64_t start = mach_absolute_time (); block (); uint64_t end = mach_absolute_time (); uint64_t elapsed = end - start; uint64_t nanos = elapsed * info.numer / info.denom; return (CGFloat)nanos / NSEC_PER_SEC; } 将目标方法放在块语法中，可得到目标方法的执行时间调用方法如下
int main (void) { CGFloat time; NSString *thing1 = @"hi"; NSString *thing2 = @"hello there"; time = BNRTimeBlock(^{ for (int i = 0; i < LOOPAGE; i++) { ; } }); printf ("isEqual: time: %f\n", time); time = BNRTimeBlock(^{ for (int i = 0; i < LOOPAGE; i++) { ; } }); printf ("isEqualToString: time: %f\n", time); return 0;}
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