24小时模拟时钟 [英] 24 hour analog clock

问题描述

我正在尝试制作24小时模拟时钟，目前有12小时制。

I'm attempting to make a 24 hour analog clock and currently have a 12 hour clock.

我写的内容：

   currentTime = [NSDate date];
dateComponents = [calendar components:unitFlags fromDate:currentTime];
hour = [dateComponents hour];
minute = [dateComponents minute];
second = [dateComponents second];
hourAngle = (30 * hour + minute / 2);
minAngle = (6 * minute);
secAngle = (6 * second);
secondHand.transform = CGAffineTransformMakeRotation(secAngle * M_PI / 180);
minuteHand.transform = CGAffineTransformMakeRotation(minAngle * M_PI / 180);
hourHand.transform = CGAffineTransformMakeRotation(hourAngle * M_PI / 180);

这适用于12小时制，但我想制作24小时，所以我被建议将我的角度值除以2：

This works perfectly for a 12 hour clock but I would like to make it 24 so I was advised to divide my angle values by 2 like this:

hourAngle = (30 * hour + minute / 2) /2;
minAngle = (6 * minute) /2;
secAngle = (6 * second) /2; 

然而，这给了我一个从上到下的180度角，在达到180度后重置。

However this gives me a top to bottom 180 degree angle which resets after reaching the 180 degrees.

我的时钟需要更改才能获得完整的360度旋转？

What do I need to change to get a full 360 degree rotation for my clock?

推荐答案

显然，分钟和秒的角度不会改变。只有小时角减半。此外，请确保小时达到最多23个值。

Clearly, the angles for minutes and seconds don't change. Only the hour angle is halved. Also, be sure that hour reaches all values up to 23.

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