自定義對象要實現歸檔必須實現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解碼歸檔數據來初始化對象。
示例1
.h頭文件
#import <Foundation/Foundation.h> @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實現文件
#import "user.h"
#define AGE @"age"
#define NAME @"name"
#define EMAIL @"email"
#define PASSWORD @"password"
@implementation user
//對屬性編碼
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeInt:_age forKey:@"age"];
[aCoder encodeObject:_name forKey:AGE];
[aCoder encodeObject:_email forKey:EMAIL];
[aCoder encodeObject:_pwd forKey:PASSWORD];
}
//對屬性解碼
- (id)initWithCoder:(NSCoder *)aDecoder
{
self=[super init];
if(self)
{
self.age=[aDecoderdecodeIntForKey:AGE];
self.name=[aDecoderdecodeObjectForKey:NAME];
self.email=[aDecoderdecodeObjectForKey:EMAIL];
self.pwd=[aDecoderdecodeObjectForKey:PASSWORD];
}
return self;
}
-(void)dealloc
{
[_name release];
[_email release];
[_pwd release];
[super dealloc];
}
@end
main函數的調用
user *userObj=[[user alloc] init];
userObj.age=33;
userObj.email=@"adfdadf@qq.com";
userObj.pwd=@"212212";
userObj.name=@"ricard";
NSString *path=[NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/custom.text"];
BOOL succ=[NSKeyedArchiver archiveRootObject:userObj toFile:path];
if (succ) {
NSLog(@"Hello, World!");
user *usertemp=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
}
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