ios - 秒表-从UIDatePicker设置开始日期

我有一个简单的秒表，它会给出从开始按钮被按下起经过几秒的时间。我需要的是从日期选择器设置开始时间。

如何获取“NSTimeInterval时间；”等于我的日期选择器？还是我需要做其他事情来设置用户的时间？

@implementation ViewController {

bool start;

// Gets time when the button is pressed.
NSTimeInterval time;

}

(void)viewDidLoad
{
[super viewDidLoad];

self.display.text = @“0:00”;

开始=假;

}

-(无效)更新{

if (start == false) {

    return;

}

NSTimeInterval currentTime = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval elapsedTime = currentTime - time;

//  minutes.
int minutes = (int)(elapsedTime / 60.0);

// seconds.
int seconds = (int)(elapsedTime = elapsedTime - (minutes * 60));


self.display.text = [NSString stringWithFormat:@"%u:%02u", minutes, seconds];

[self performSelector:@selector(update) withObject:self afterDelay:0.1];

}

最佳答案

您可以使用:

NSTimeInterval timePicker = [[self.datePicker date] timeIntervalSinceReferenceDate];
NSTimeInterval currentTime = [[NSDate date] timeIntervalSinceReferenceDate];
NSTimeInterval elapsedTime = currentTime - timePicker;
//  minutes.
   int minutes = (int)(elapsedTime / 60.0);

// seconds.
   int seconds = (int)(elapsedTime = elapsedTime - (minutes * 60));