[英]ECGraph not working on device, but works on simulator
is there any reason why ECGraph would run fine on the simulator, but yet give me this error when i run it on my device: 有什么理由说为什么ECGraph可以在模拟器上正常运行,但是当我在我的设备上运行它时却给我这个错误:
2012-08-24 01:57:18.543 Portfolio[3538:907] *** -[__NSCFCalendar components:fromDate:toDate:options:]: fromDate cannot be nil
I mean really, what do you think that operation is supposed to mean with a nil fromDate?
An exception has been avoided for now.
A few of these errors are going to be reported with this complaint, then further violations will simply silently do whatever random thing results from the nil.
Here is the backtrace where this occurred this time (some frames may be missing due to compiler optimizations):
(
0 CoreFoundation 0x37a1d78f <redacted> + 86
1 Portfolio 0x000a0d1f -[ECGraph(Private) getDaysFrom:To:] + 202
2 Portfolio 0x000a1577 -[ECGraph(Private) getXDaysFromLines:minDate:] + 502
3 Portfolio 0x000a2623 -[ECGraph drawCurveWithLines:lineWidth:color:] + 978
4 Portfolio 0x000a716f -[GraphView drawRect:] + 2682
5 UIKit 0x38b1811d <redacted> + 364
6 QuartzCore 0x39468035 <redacted> + 112
7 QuartzCore 0x39467771 <redacted> + 1808
8 QuartzCore 0x39466f45 <redacted> + 980
9 QuartzCore 0x39466a7b <redacted> + 202
10 QuartzCore 0x3953a9f5 <redacted> + 24
11 QuartzCore 0x394663d3 <redacted> + 238
12 QuartzCore 0x39466119 <redacted> + 316
13 QuartzCore 0x3945dfe1 <redacted> + 60
14 CoreFoundation 0x37a4f18d <redacted> + 20
15 CoreFoundation 0x37a4d3f9 <redacted> + 276
16 CoreFoundation 0x37a4d74f <redacted> + 742
17 CoreFoundation 0x379cbc1d CFRunLoopRunSpecific + 356
18 CoreFoundation 0x379cbaa9 CFRunLoopRunInMode + 104
19 GraphicsServices 0x3a88f33b GSEventRunModal + 74
20 UIKit 0x38b35535 UIApplicationMain + 1120
21 Portfolio 0x00094e7d main + 152
22 Portfolio 0x00094de0 start + 40
) )
You are trying to get NSDateComponents from a nil NSDate like that: 你试图从这样的nil NSDate获取NSDateComponents:
NSCalendar* gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate* fromDate = nil;
NSDate* toDate = [NSDate date];
unsigned int components = NSYearCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit;
NSDateComponents* dateComponents = [gregorian components:uintFlags fromDate:fromDate toDate:toDate options:0];
Probably a simple check can be useful: 可能一个简单的检查可能是有用的:
NSDate* fromDate = nil;
NSDate* toDate = [NSDate date];
NSDateComponents* dateComponents = nil;
if(fromDate != nil)
{
NSCalendar* gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
unsigned int components = NSYearCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit;
dateComponents = [gregorian components:uintFlags fromDate:fromDate toDate:toDate options:0];
}
Your device is using a different Region Format than your simulator. 您的设备使用的区域格式与模拟器不同。
If you match those (in Settings -> General -> International
), then they should show the same result. 如果你匹配(在
Settings -> General -> International
),那么他们应该显示相同的结果。 In my case, when doing this, they both failed, but the simulator didn't give the same log as the device so I nearly missed it. 在我的情况下,当这样做时,他们都失败了,但模拟器没有提供与设备相同的日志,所以我几乎错过了它。
I assume you are using an NSDateFormatter
to format some string-date to NSDate as I was. 我假设您正在使用
NSDateFormatter
将某些字符串日期格式化为NSDate。 In that case you have to make sure that this won't depend on what kind of region the phone is, and set the solution to always be the same, whereever you are. 在这种情况下,您必须确保这不取决于手机的区域类型,并将解决方案设置为始终相同,无论您是谁。
[df setLocale:([[NSLocale alloc] initWithLocaleIdentifier:@"en_UK"])];
// df being the NSDateFormatter-object
This tells the formatter to format using UK standards, which was needed in my case. 这告诉格式化程序使用英国标准进行格式化,这在我的案例中是必需的。 Enter your needed country code, ie
en_US
etc. 输入您需要的国家代码,即
en_US
等。
Sti 性病
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