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];}@endmain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]; }感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
新聞熱點
疑難解答
