从现在开始到按下按钮的时间？

Question

我想知道如何记录运行下面的方法所花费的时间，以及何时按下UIButton - 任何人都可以帮忙？

-(void)informToPress 
{ 
    textLabel.text = @"Test, press the button"; 
    //begin record and end record on button press 
} 

谢谢

Answer 1

-(void)informToPress 
{ 
    textLabel.text = @"Test, press the button"; 
    //begin record and end record on button press 

    startDate = [[NSDate alloc]init]; 
} 

-(IBAction)stopTime{ 
    stopDate = [[NSDate alloc]init]; 

    //The actual time in seconds 
    NSLog(@"Time in seconds %f", [stopDate timeIntervalSinceDate:startDate]); 
} 

OR

-(IBAction)calculateTime{ 
     //The actual time in seconds just calculated not stored. 
     NSLog(@"Time in seconds %f", [startDate timeIntervalSinceNow]); 
}