iOS中的数字格式问题

在我的iOS应用程序中，我尝试在第一次执行应用程序时填充核心数据存储。我在AppDelegate.m文件中使用以下代码，我将以创建实体的一个对象为例：

     //creating new managedObject

     NSManagedObject *favoriteThing = [NSEntityDescription insertNewObjectForEntityForName:@"FavoriteThing" inManagedObjectContext:[self managedObjectContext]];


    //extracting year,month and day from current date

    todayDate = [NSDate date];        
    NSCalendar* calendar = [NSCalendar currentCalendar];
    NSDateComponents* components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit fromDate:todayDate]; // Get necessary date components

    //converting components      
    NSNumber *yearBuscado = [NSNumber numberWithLong:[components year]];
    NSNumber *mesBuscado = [NSNumber numberWithLong:[components month]];
    NSNumber *diaBuscado = [NSNumber numberWithLong:[components day]];

    //populating managedObject

    [favoriteThing setValue:@"If done, swipe to right " forKey:@"thingName"];//String
    [favoriteThing setValue:[NSNumber numberWithInt:10] forKey:@"displayOrder"];//Integer32   
    [favoriteThing setValue:[NSNumber numberWithInt:yearBuscado] forKey:@"todoYear"];//Integer32
    [favoriteThing setValue:[NSNumber numberWithInt:mesBuscado] forKey:@"todoMonth"];//Integer32
    [favoriteThing setValue:[NSNumber numberWithInt:diaBuscado] forKey:@"todoDay"];//Integer32
    [favoriteThing setValue:@"Urgent" forKey:@"urgent"];//String
    [favoriteThing setValue:@"Yellow" forKey:@"color"];//String
    [favoriteThing setValue:@"Not deleted" forKey:@"isSemiDeleted"];//String
    [favoriteThing setValue:@"Not done" forKey:@"isDone"];//String

这是首次启动应用程序后存储的内容（摘自SQLite manager）：

我需要的是存储今天（2014-01-04）的预期值：

这三个属性来自类型

Integer 32

我做错了什么？

---

感谢您的时间。

在现代目标C中，使用NSNumber，事情变得很简单。您可以将您的数字定义为：

NSNumber *todoYear = @2014;
NSNumber *todoMonth = @1;
NSNumber *todoDay = @4;

编译器会处理一切。快乐编码：）

查看这些链接了解更多信息。

编辑
使用以下命令：

NSNumber *yearBuscado = @([components year]);

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您错误地使用NSNumber对象调用了

numberwhithint

，而直接使用该NSNumber调用了setValue

todayDate = [NSDate date];        
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit fromDate:todayDate]; // Get necessary date components

//converting components      
NSNumber *yearBuscado = [NSNumber numberWithInteger:[components year]];
NSNumber *mesBuscado = [NSNumber numberWithInteger:[components month]];
NSNumber *diaBuscado = [NSNumber numberWithInteger:[components day]];

[favoriteThing setValue:yearBuscado forKey:@"todoYear"];//Integer32
[favoriteThing setValue:mesBuscado forKey:@"todoMonth"];//Integer32
[favoriteThing setValue:diaBuscado forKey:@"todoDay"];//Integer32

此外，还可以从CoreData模型生成模型类。因此，您可以通过

属性

将值设置为

NSManagedObject

，而不是进行键值编码

像

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谢谢，但我需要从当前日期获取值，因此我使用的是NSDATE组件…NSNumber*todoYear=@（[components year]）如何？是的，这肯定是一个有效的答案。这将在将来有所帮助：）@mvasco你在找什么？问题已纠正？尚未检查，但我想您的建议是正确的，谢谢。我会让你知道，因为我检查它…谢谢你，你的第一个建议是工作的预期。非常感谢你。祝你白天/晚上愉快。。。。

todayDate = [NSDate date];        
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit fromDate:todayDate]; // Get necessary date components

//converting components      
NSNumber *yearBuscado = [NSNumber numberWithInteger:[components year]];
NSNumber *mesBuscado = [NSNumber numberWithInteger:[components month]];
NSNumber *diaBuscado = [NSNumber numberWithInteger:[components day]];

[favoriteThing setValue:yearBuscado forKey:@"todoYear"];//Integer32
[favoriteThing setValue:mesBuscado forKey:@"todoMonth"];//Integer32
[favoriteThing setValue:diaBuscado forKey:@"todoDay"];//Integer32

FavoriteThing *favoriteThing = [NSEntityDescription insertNewObjectForEntityForName:@"FavoriteThing" inManagedObjectContext:[self managedObjectContext]];
[favoriteThing setBuscado: yearBuscado];