日期选择器代码有问题
我最近在我的医疗应用程序中添加了一项功能，可以根据输入的日期计算患者的年龄。如果年龄为零，则日期选择器将显示 1950 年 1 月 1 日作为输入出生日期的默认开始日期。该代码在 iPhone 和 iPad 硬件上的 iOS 4.0+ 上运行良好。然而，在提交应用程序更新之前进行测试时，我发现日期选择器在我的第一代 iPod 上崩溃了，我保留它来测试 iOS 3.1.3。我缩小了以下代码作为罪魁祸首的范围，它设置了日期选择器的默认日期：
if (age == 0) {
NSDateFormatter *myFormatter = [[NSDateFormatter alloc] init];
[myFormatter setDateFormat:@"M/d/yy"];
NSDate *initialDate = [myFormatter dateFromString:@"January/01/1950"];
[picker setDate:initialDate animated:YES];
}
iPod 的日志在崩溃后显示以下两行：
<Warning>: *** Assertion failure in -[UIDatePickerView _updateBitsForDate:andReload:animateIfNeeded:], /SourceCache/UIKit/UIKit-984.38/UIDatePicker.m:908
如果
<Error>: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: date'
您能帮助我理解为什么此崩溃仅发生在较旧的设备上，我将不胜感激设备，以及如何解决该问题。提前致谢。
I recently added a feature to my medical app that calculates a patient's age from an entered date. If the age is zero, then the date picker displays January 1, 1950 as a default starting date for entry of the date of birth. The code works fine on iOS 4.0+ on iPhone and iPad hardware. However, when testing just prior to submission for an app update, I found the date picker crashing on my first-generation iPod, which I keep for testing iOS 3.1.3. I narrowed down the following code as the culprit, which sets the default date for the date picker:
if (age == 0) {
NSDateFormatter *myFormatter = [[NSDateFormatter alloc] init];
[myFormatter setDateFormat:@"M/d/yy"];
NSDate *initialDate = [myFormatter dateFromString:@"January/01/1950"];
[picker setDate:initialDate animated:YES];
}
The log from the iPod shows the following two lines after the crash:
<Warning>: *** Assertion failure in -[UIDatePickerView _updateBitsForDate:andReload:animateIfNeeded:], /SourceCache/UIKit/UIKit-984.38/UIDatePicker.m:908
and
<Error>: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: date'
I would appreciate any help in understanding why this crash occurs only on the older device, and how to solve the issue. Thanks in advance.
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根据 tr35-10 标准，您的日期格式应为
MMMM/dd/yyyy。您还应该 缓存格式化程序以提高效率。
According to the tr35-10 standard, your date format should be
MMMM/dd/yyyy.You should also cache formatters for efficiency.