ios - 秒表 - 从 UIDatePicker 设置开始日期

Question

我有一个简单的秒表，可以显示自按下开始按钮以来耗时(以秒为单位)。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？

@实现 View Controller {

bool start;

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

• (无效)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];

Answer 1

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));