平時使用中,我們通常需要通過對自定義對象進行歸檔處理,自定義對象要進行歸檔,需要去實作NSCoding協定.
NSCoding協定有兩個方法,encodeWithCoder方法對對象的屬性資料做編碼處理。
initWithCoder方法解碼歸檔資料來進行初始化對象。
實作NSCoding協定後,就能通過NSKeyedArchiver進行歸檔
下面來看下例子代碼:
Person.h頭檔案代碼:
#import <Foundation/Foundation.h>
@interface Person : NSObject <NSCoding>
@property(nonatomic,copy)NSString *name;
@property(nonatomic,copy)NSString *email;
@property(nonatomic,copy)NSString *password;
@property(nonatomic,assign)int age;
@end
Person.m實作代碼:
#import "Person.h"
#define AGE @"age"
#define NAME @"name"
#define EMAIL @"email"
#define PASSWORD @"password"
@implementation Person
//對對象屬性進行編碼方法
- (void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeInt:_age forKey:AGE];
[aCoder encodeObject:_name forKey:NAME];
[aCoder encodeObject:_email forKey:EMAIL];
[aCoder encodeObject:_password forKey:PASSWORD];
}
//對對象屬性進行解碼方法
- (id)initWithCoder:(NSCoder *)aDecoder{
self=[super init];
if (self!=nil) {
_age=[aDecoder decodeIntForKey:AGE];
_name=[[aDecoder decodeObjectForKey:NAME]copy];
_email=[[aDecoder decodeObjectForKey:EMAIL]copy];
_password=[[aDecoder decodeObjectForKey:PASSWORD]copy];
}
return self;
}
-(void)dealloc{
[_name release];
[_email release];
[_password release];
[super dealloc];
}
main.m函數代碼:
#import <Foundation/Foundation.h>
#import "Person.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
Person *person=[[Person alloc]init];
person.name[email protected]"jack";
person.age=20;
person.email[email protected]"[email protected]";
person.password[email protected]"12345";
NSString *homePath=NSHomeDirectory();
NSString *srcPath=[homePath stringByAppendingPathComponent:@"Desktop/person.archiver"];
BOOL success=[NSKeyedArchiver archiveRootObject:person toFile:srcPath];
if (success) {
NSLog(@"歸檔自定義對象成功.");
}
//還原資料
Person *result= [NSKeyedUnarchiver unarchiveObjectWithFile:srcPath];
NSLog(@"name=%@",result.name);
NSLog(@"age=%d",result.age);
NSLog(@"email=%@",result.email);
NSLog(@"password=%@",result.password);
}
return 0;
}
運作截圖: