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I want to save & retrive current time (if today) or date of the note created in Core Data
Please guide me on how I can do this.
553
In a Core Data store, a Date attribute is a double value that represents a number of seconds since 1970. Using a variety of calendars, time zones, and locales, an app can convert a Date value to different date strings, or convert a date string to different Date values.
To save an object with Core Data, you can simply create a new instance of the NSManagedObject subclass and save the managed context. In the code above, we've created a new Person instance and saved it locally using Core Data.
There are two steps to storing an array of a custom struct or class in Core Data. The first step is to create a Core Data entity for your custom struct or class. The second step is to add a to-many relationship in the Core Data entity where you want to store the array.
You can have your custom NSManagedObject subclass set an attribute as soon as it's inserted in a context by overriding the -awakeFromInsert method:
@interface Person : NSManagedObject
@property (nonatomic, copy) NSDate *creationDate; // modeled property
@end
@implementation Person
@dynamic creationDate; // modeled property
- (void)awakeFromInsert
{
[super awakeFromInsert];
self.creationDate = [NSDate date];
}
@end
Note that creationDate above is a modeled property of Core Data attribute type "date", so its accessor methods are generated automatically. Be sure to set your entity's custom NSManagedObject class name appropriately as well.
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