Question

需要帮助。我已经看到了其他答案，但对此并不了解。如何以小时和分钟打印开始和停止时间之间的时差？

NSDateFormatter *Formatter = [[NSDateFormatter alloc] init];
[Formatter setDateFormat:@"HH:mm"];
if (count == 0) {
    _startTime.text = [Formatter stringFromDate:[NSDate date]];
    [sender setTitle:@"Stop" forState:UIControlStateNormal];
}else {
    _stopTime.text = [Formatter stringFromDate:[NSDate date]];
    _startStopLabel.hidden = YES;
    //write to UILabel "totalTime" the difference between the stop and start times in hours, minutes.
}

如果需要什么，请问:)（第一篇文章）谢谢大家:)）

Answer 1

您需要减去日期，然后转换生成的时间间隔：

NSDateFormatter *Formatter = [[NSDateFormatter alloc] init];
[Formatter setDateFormat:@"HH:mm"];
NSDate date1 = nil;
if (count == 0) {
    date1 = [NSDate date];
    _startTime.text = [Formatter stringFromDate:date1];
    [sender setTitle:@"Stop" forState:UIControlStateNormal];
}else {
    NSDate date2 = [NSDate date];
    _stopTime.text = [Formatter stringFromDate:date2];
    _startStopLabel.hidden = YES;

    long diff = (long)[date2 timeIntervalSinceDate:date1];
    diff /= 60; //Convert to minutes
    //write to UILabel "totalTime" the difference between the stop and start times in hours, minutes.
    _totalTime.text = [NSString stringWithFormat:@"%d hours, %d minutes", diff/60, diff%60];
}

麻烦总时间

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