分享一個時間消耗計算宏（oc)

#import "ViewController.h"    #define TICK   NSDate *startTime = [NSDate date]  #define TOCK   NSLog(@"Time: %f", -[startTime timeIntervalSinceNow])    @interface ViewController ()    @end    @implementation ViewController    - (void)viewDidLoad {        [super viewDidLoad];        TICK;      for (int i = 0; i < 5; i++) {          NSLog(@"我的值：%d",i);      }      TOCK;  }    @end
#import "ViewController.h"

#define TICK   NSDate *startTime = [NSDate date]
#define TOCK   NSLog(@"Time: %f", -[startTime timeIntervalSinceNow])

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    TICK;
    for (int i = 0; i < 5; i++) {
        NSLog(@"我的值：%d",i);
    }
    TOCK;
}

@end