使用 24 - 12 小时格式的 xcode 在“TimePicker”中设置 NSDate
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Setting NSDate in a "TimePicker" with 24 - 12 hours format xcode
提问by Jimmy G
I'm working with some NSDate objects, and well, I use my iPhone with 24 hrs format, so when I was testing my app, everything went fine, but, one of my friends tried the app on his iPhone, but he uses 12hrs format, after some research I found out that the problem was the date, and I have no idea why I use this to set a date picker and a time picker, so I read some values from a database (yes, I've checked the values and they are correct, it is not a value-issue), so all this data is formatted and put together as a NSDate, then, I set the date picker and time picker with this date I just created
我正在处理一些 NSDate 对象，好吧，我使用 24 小时格式的 iPhone，所以当我测试我的应用程序时，一切正常，但是，我的一位朋友在他的 iPhone 上尝试了该应用程序，但他使用了 12 小时格式，经过一番研究，我发现问题出在日期上，我不知道为什么我用它来设置日期选择器和时间选择器，所以我从数据库中读取了一些值（是的，我已经检查了值并且它们是正确的，这不是一个值问题），所以所有这些数据都被格式化并作为一个 NSDate 放在一起，然后，我用我刚刚创建的这个日期设置日期选择器和时间选择器
NSDateFormatter *currentDate = [[[NSDateFormatter alloc] init] autorelease];
[currentDate setDateFormat:@"yyyy-MM-dd HH:mm"];
NSDate * startDate =[currentDate dateFromString:[NSString stringWithFormat:@"%d-%d-%d %d:%d",yearVal,monthVal,dayVal,hourVal,minVal]];
[datePicker setDate:startDate];
[timePicker setDate:startDate];
So, yearVal, monthVal, dayVal, hourVal, minVal are all NSIntegers... the thing is, that, it perfectly works if your iPhone/iPod is using 24 hours in your clock settings, but, if you are using 12 hours format, it crashes and shows this error message
所以，yearVal、monthVal、dayVal、hourVal、minVal 都是 NSIntegers ......事实是，如果你的 iPhone/iPod 在你的时钟设置中使用 24 小时，它完美地工作，但是，如果你使用 12 小时格式，它崩溃并显示此错误消息
> *** Assertion failure in -[UIDatePickerView _updateBitsForDate:forced:andReload:animateIfNeeded:], /SourceCache/UIKit/UIKit-1914.85/UIDatePicker.m:1200 2012-06-29
> 01:19:15.753 MyApp[1215:707] *** Terminating app due to uncaught
> exception 'NSInternalInconsistencyException', reason: 'Invalid
> parameter not satisfying: date'
> *** First throw call stack: (0x3710188f 0x34e06259 0x37101789 0x379403a3 0x31042807 0x30f616c5 0x30f61563 0x31042385 0xf48ef 0xf7bd3
> 0x30e0ec8b 0x30e1b1e9 0x30e1b059 0x30e1af3f 0x30e1a7c1 0x30e1a503
> 0x30e0eaff 0x30e0e7d5 0xdd945 0x30e8793d 0x30f01627 0x37972933
> 0x370d5a33 0x370d5699 0x370d426f 0x370574a5 0x3705736d 0x33816439
> 0x30e03cd5 0xd4cbb 0xd4c60) terminate called throwing an
> exception(gdb)
So please, if you have any idea of how to fix this, I would appreciate your help
所以，如果您对如何解决此问题有任何想法，我将不胜感激
oh, and I've read that HH returns hours in 24 hours format, well, all my app uses HH, so i don't understand why I keep watching some "a.m." or "p.m." in some of the NSLogs i print to debug
哦，我已经读过 HH 以 24 小时格式返回小时，好吧，我所有的应用程序都使用 HH，所以我不明白为什么我一直在我打印的某些 NSLog 中观看一些“am”或“pm”调试
Thanks in advance
提前致谢
oh sorry, I almost forget if i comment the lines
哦对不起，我差点忘了我是否评论这些台词
[datePicker setDate:startDate];
[timePicker setDate:startDate];
the app doesn't crash, but of course, it doesn't show the time and date I require
该应用程序不会崩溃，但当然，它不会显示我需要的时间和日期
NOTE: I need to use 24 hours format, if I decide to select format with am pm I will have to change all my app, and well, I don't have enough time for that
注意：我需要使用 24 小时格式，如果我决定使用 am pm 选择格式，我将不得不更改我所有的应用程序，而且我没有足够的时间
回答by Kevin Horgan
Take a look at this like: Find if user prefers 12 / 24 Hour Clock?… think the second answer might be the best for you. Then depending on if the user's device uses a 12 hour clock or 24 hour clock you can set your [currentDate setDateFormat:....] accordingly.
看看这样的：查找用户是否喜欢 12 / 24 小时制？...认为第二个答案可能最适合您。然后，根据用户的设备是使用 12 小时制还是 24 小时制，您可以相应地设置 [currentDate setDateFormat:....]。
If you want a 12 hour clock then set currentDate as follows:
如果您想要 12 小时制，请按如下方式设置 currentDate：
[currentDate setDateFormat:@"yyyy-MM-dd h:mm:ss a"];
If you want a 24 hour clock then set currentDate as follows:
如果您想要 24 小时制，请按如下方式设置 currentDate：
[currentDate setDateFormat:@"yyyy-MM-dd HH:mm"];
