iOS_查看某段代码生命周期(宏)

1.宏定义

1.定义宏

#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