To implement the archive of a custom object, the NSCoding protocol must be implemented.
The NSCoding protocol has two methods: the encodeWithCoder method encodes the object's attribute data, and the initWithCoder decodes the archived data to initialize the object.
Example 1
.h header file
#import <Foundation/> @interface user : NSObject <NSCoding> @property(nonatomic,retain)NSString *name; @property(nonatomic,retain)NSString *email; @property(nonatomic,retain)NSString *pwd; @property(nonatomic,assign)int age; @end
.m implementation file
#import ""
#define AGE @"age"
#define NAME @"name"
#define EMAIL @"email"
#define PASSWORD @"password"
@implementation user
//Encoding attributes- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeInt:_age forKey:@"age"];
[aCoder encodeObject:_name forKey:AGE];
[aCoder encodeObject:_email forKey:EMAIL];
[aCoder encodeObject:_pwd forKey:PASSWORD];
}
//Decode the attribute- (id)initWithCoder:(NSCoder *)aDecoder
{
self=[super init];
if(self)
{
=[aDecoderdecodeIntForKey:AGE];
=[aDecoderdecodeObjectForKey:NAME];
=[aDecoderdecodeObjectForKey:EMAIL];
=[aDecoderdecodeObjectForKey:PASSWORD];
}
return self;
}
-(void)dealloc
{
[_name release];
[_email release];
[_pwd release];
[super dealloc];
}
@end
Calling main function
user *userObj=[[user alloc] init];
=33;
=@"adfdadf@";
=@"212212";
=@"ricard";
NSString *path=[NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/"];
BOOL succ=[NSKeyedArchiver archiveRootObject:userObj toFile:path];
if (succ) {
NSLog(@"Hello, World!");
user *usertemp=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
}
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