Question

我正在构建复杂的Xcode应用程序，并且我被要求有一个开始时间，并且停止时间字段，计算到十进制字段。

现在时间必须是24小时格式，只能是HHmm格式，而不是HH：mm！

当数字在字段中开始/停止时有一个从右边开始的计算，计算左边两个char $将是分钟，第三个和第四个char $将是小时。然后转换为小数0.00。

我从哪里开始？

Stack Overflow问题 Time in HHMM format 适用于Java。 Xcode怎么样？

Answer 1

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"HHmm"];
NSString *timeString = [formatter stringFromDate:[NSDate date]];

Answer 2

// Sample code
double duration = 2.75;
double decimal = floor(duration) - duration; // decimal = .75 (floor will round down)
double minutes = .75 * 60; // 60 minutes per hour, multiply to convert from decimal to minutes

Answer 3

小数时间

输入数字到参考时间，但不要在24小时或更长时间内输入十进制数字。唯一的计算是将一串数字拆分为两个字符串，并以十进制格式计算开始和结束。

    // Strings converted to integers, and float integers back into strings.
    // Time entered in is ONLY 24 hour with 00,15,30,45 minutes.

    @synthesize labelTotal;
    @synthesize labelStart;
    @synthesize labelStop;
    @synthesize remarkLabel;

    NSString *START = [self.startTextField text];
    NSString *END = [self.stopTextField text];
    remarkLabel.text = @"";

    //Take START convert to Decimal
    NSLog(@"startString: %@", START);

    //Convert nsstring (24 Hour) to decimal
    int a = [self.startTextField.text intValue];

    int startHH = a / 100;
    int startmm = a % 100;

    NSLog(@"startHH: %d", startHH);
    NSLog(@"startmm: %d", startmm);

    //Define startmm
    if (startmm == 15)
    {
        NSInteger mmTime = 25;
        NSLog(@"Start Hour is: %d", startHH);
        NSLog(@"Start Minutes is: %ld", (long)mmTime);

        //Combine startHH.mmTime

        NSString *newStart1a = [NSString stringWithFormat:@"%d", startHH];
        NSString *newStart1b = [NSString stringWithFormat:@"%ld", (long)mmTime];
        NSString *recStart1a = [NSString stringWithFormat:@"%@.%@", newStart1a, newStart1b];

        NSLog(@"Decimal Start Time is: %@", recStart1a);
        labelStart.text = recStart1a;
    }
    else
        if (startmm == 30)
        {
            int mmTime = 50;
            NSLog(@"Minutes is: %ld", (long)mmTime);
            //Combine startHH.mmTime

            NSString *newStart1d = [NSString stringWithFormat:@"%d", startHH];
            NSString *newStart1e = [NSString stringWithFormat:@"%ld", (long)mmTime];
            NSString *recStart1b = [NSString stringWithFormat:@"%@.%@", newStart1d, newStart1e];

            NSLog(@"Decimal Start Time is: %@", recStart1b);
            labelStart.text = recStart1b;
        }
        else
            if (startmm == 45)
            {
                int mmTime = 75;
                NSLog(@"Minutes is: %ld", (long)mmTime);
                //Combine startHH.mmTime

                NSString *newStart1g = [NSString stringWithFormat:@"%d", startHH];
                NSString *newStart1h = [NSString stringWithFormat:@"%ld", (long)mmTime];
                NSString *recStart1c = [NSString stringWithFormat:@"%@.%@", newStart1g, newStart1h];

                NSLog(@"Decimal Start Time is: %@", recStart1c);
                labelStart.text = recStart1c;
            }
            else
                if (startmm == 00)
                {
                    NSString *newStart1g = [NSString stringWithFormat:@"%d", startHH];
                    NSString *recStart1c = [NSString stringWithFormat:@"%@.00", newStart1g];

                    NSLog(@"Decimal Start Time is: %@", recStart1c);
                    labelStart.text = recStart1c;
                }

    //Take END convert to Decimal
    NSLog(@"stopString: %@", END);

    int b = [self.stopTextField.text intValue];
    int stopHH = b / 100;
    int stopmm = b % 100;

    NSLog(@"stopHH: %d", stopHH);
    NSLog(@"stopmm: %d", stopmm);

    //Define stopmm
    if (stopmm == 15)
    {
        NSInteger mmTime = 25;
        NSLog(@"Start Hour is: %d", stopHH);
        NSLog(@"Start Minutes is: %ld", (long)mmTime);

        //Combine startHH.mmTime
        NSString *newStop1a = [NSString stringWithFormat:@"%d", stopHH];
        NSString *newStop1b = [NSString stringWithFormat:@"%ld", (long)mmTime];
        NSString *recStop1a = [NSString stringWithFormat:@"%@.%@", newStop1a, newStop1b];

        NSLog(@"Decimal Start Time is: %@", recStop1a);
        labelStop.text = recStop1a;
    }
    else
        if (stopmm == 30)
        { int mmTime = 50;
            NSLog(@"Minutes is: %ld", (long)mmTime);
            //Combine startHH.mmTime

            NSString *newStop1d = [NSString stringWithFormat:@"%d", stopHH];
            NSString *newStop1e = [NSString stringWithFormat:@"%ld", (long)mmTime];
            NSString *recStop1b = [NSString stringWithFormat:@"%@.%@", newStop1d, newStop1e];

            NSLog(@"Decimal Start Time is: %@", recStop1b);
            labelStop.text = recStop1b;
        }

        else if (stopmm == 45)
        {
            int mmTime = 75;
            NSLog(@"Minutes is: %ld", (long)mmTime);

            //Combine startHH.mmTime
            NSString *newStop1g = [NSString stringWithFormat:@"%d", stopHH];
            NSString *newStop1h = [NSString stringWithFormat:@"%ld", (long)mmTime];
            NSString *recStop1c = [NSString stringWithFormat:@"%@.%@", newStop1g, newStop1h];

            NSLog(@"Decimal Start Time is: %@", recStop1c);
            labelStop.text = recStop1c;
        }
        else
            if (stopmm == 00)
            {
                NSString *newStop1g = [NSString stringWithFormat:@"%d", stopHH];
                NSString *recStop1c = [NSString stringWithFormat:@"%@.00", newStop1g];

                NSLog(@"Decimal Start Time is: %@", recStop1c);
                labelStop.text = recStop1c;
            }

    //Convert back into decimal
    float start1 = [self.labelStart.text floatValue];
    float stop1 = [self.labelStop.text floatValue];

    NSLog(@"Start Start: %f", start1);
    NSLog(@"Stop Stop: %f", stop1);

    //Subtact END from START in Decimal
    float c = stop1 - start1;

    //Show TOTAL in Decimal
    NSString *total1 = [NSString stringWithFormat:@"%g", c];

    if ([total1 isEqual:@"0"])
    {
        labelTotal.text = @"";
        NSLog(@"BLANK");
    }
    else
    {
        labelTotal.text = total1;
        NSLog(@"Total: %@", total1);
    }

    //You can add additional if statements below for more conditions needed
}

时间设定HHmm

3 个答案: