If you have a custom class and save the object of class in NSUserDefaults you have the use initWithCoder and encodeWithCoder.
Example class :-
TestClass.h
#import <Foundation/Foundation.h>
@interface TestClass : NSObject{
NSString *strTest;
NSMutableDictionary *dictTest;
int test;
}
@property(nonatomic,retain)NSString *strTest;
@property(nonatomic,retain)NSMutableDictionary *dictTest;
@property(nonatomic,assign)int test;
@end
TestClass.m
#import "TestClass.h"
@implementation TestClass
@synthesize strTest,dictTest,test;
-(id)initWithCoder:(NSCoder *)coder{
self=[[TestClass alloc]init];
if (self!=nil) {
self.strTest=[coder decodeObjectForKey:@"strTest"];
self.dictTest=[coder decodeObjectForKey:@"dictTest"];
self.test=[coder decodeIntegerForKey:@"test"];
}
return self;
}
-(void)encodeWithCoder:(NSCoder *)coder{
[coder encodeObject:self.strTest forKey:@"strTest"];
[coder encodeObject:self.strTest forKey:@"dictTest"];
[coder encodeInt:self.test forKey:@"test"];
}
@end
Save and retrieve this TestClass object from NSUserDefaults.
Save Object
//create object
TestClass *objTest=[[TestClass alloc]init];
//set data
objTest.strTest=@"Testing";
objTest.test=10;
NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];
[dict setObject:@"Testing" forKey:@"Test"];
objTest.dictTest=dict;
//save object to NSUserDefaults
NSData *data=[NSKeyedArchiver archivedDataWithRootObject:objTest];
NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
[userDefaults setObject:data forKey:@"customObject"];
[userDefaults synchronize];
Retrieve Object
NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
NSData *dataSavedForObject = [userDefaults objectForKey:@"customObject"];
TestClass *objTest=[NSKeyedUnarchiver unarchiveObjectWithData:dataSavedForObject];
Now you get the object of TestClass.
