【Objective-C】OC中自定義對象的歸檔基本概念和使用方法(實現NSCoding協議)

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,需要去實現NSCoding協議.

NSCoding協議有兩個方法，encodeWithCoder方法對對象的屬性數據做編碼處理。

                                             initWithCoder方法解碼歸檔數據來進行初始化對象。

實現NSCoding協議后，就能通過NSKeyedArchiver進行歸檔

下面來看下例子代碼:

Person.h頭文件代碼:

#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

#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]; }

#import <Foundation/Foundation.h> #import "Person.h" int main(int argc, const char * argv[]) {      @autoreleasepool {         Person *person=[[Person alloc]init];         person.name=@"jack";         person.age=20;         person.email=@"jack@163.com";         person.password=@"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.");         }                  //還原數據         Person *result= [NSKeyedUnarchiver unarchiveObjectWithFile:srcPath];         NSLog(@"name=%@",result.name);         NSLog(@"age=%d",result.age);         NSLog(@"email=%@",result.email);         NSLog(@"password=%@",result.password);     }     return 0; }