iOS获取一个方法的执行时间
#import <Foundation/Foundation.h> #import <mach/mach_time.h> typedef void (^block)(void); @interface FunctionRunTime : NSObject + (CGFloat)runTimeBlock:(block)block; @end #import "FunctionRunTime.h" @implementation FunctionRunTime + (CGFloat)runTimeBlock:(block)block { 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; } // BNRTimeBlock @end // 使用 CGFloat time= [FunctionRunTime runTimeBlock:^{ for (int i = 0; i < 1000; i++) { }]; NSLog ("time: %f\n", time);